Chapter. Sampling Distributions Pearson Prentice Hall. All rights reserved

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1 Chapter 8 Sampling Distributions 2010 Pearson Prentice Hall. All rights reserved

2 Section 8.1 Distribution of the Sample Mean 2010 Pearson Prentice Hall. All rights reserved

3 Objectives 1. Describe the distribution of the sample mean: samples from normal populations 2. Describe the distribution of the sample mean: samples from a population that is not normal 2010 Pearson Prentice Hall. All rights reserved 8-3

4 Statistics such as are random variables since their value varies from sample to sample. As such, they have probability distributions associated with them. In this chapter we focus on the shape, center and spread of statistics such as Pearson Prentice Hall. All rights reserved 8-4

5 The sampling distribution of a statistic is a probability distribution for all possible values of the statistic computed from a sample of size n. The sampling distribution µ of the sample mean µ x x is the probability distribution of all possible values of the random variable computed from a sample of size n from a population with mean µ and standard deviation σ Pearson Prentice Hall. All rights reserved 8-5

6 2010 Pearson Prentice Hall. All rights reserved 8-6

7 2010 Pearson Prentice Hall. All rights reserved 8-7

8 2010 Pearson Prentice Hall. All rights reserved 8-8

9 Given the following data: Choose a SRS of size 6 Find the mean and standard deviation of your sample. We will then combine the class data on the board Pearson Prentice Hall. All rights reserved 8-9

10 Objective 1 Describe the Distribution of the Sample Mean- Samples from Normal Populations 2010 Pearson Prentice Hall. All rights reserved 8-10

11 Parallel Example 1: Sampling Distribution of the Sample Mean-Normal Population The weights of pennies minted after 1982 are approximately normally distributed with mean 2.46 grams and standard deviation 0.02 grams. Approximate the sampling distribution of the sample mean by obtaining 200 simple random samples of size n = 5 from this population Pearson Prentice Hall. All rights reserved 8-11

12 The data on the following slide represent the sample means for the 200 simple random samples of size n = 5. For example, the first sample of n = 5 had the following data: Note: = for this sample 2010 Pearson Prentice Hall. All rights reserved 8-12

13 Sample Means for Samples of Size n = Pearson Prentice Hall. All rights reserved 8-13

14 The mean of the 200 sample means is 2.46, the same as the mean of the population. The standard deviation of the sample means is , which is smaller than the standard deviation of the population. The next slide shows the histogram of the sample means Pearson Prentice Hall. All rights reserved 8-14

15 2010 Pearson Prentice Hall. All rights reserved 8-15

16 What role does n, the sample size, play in the standard deviation of the distribution of the sample mean? 2010 Pearson Prentice Hall. All rights reserved 8-16

17 What role does n, the sample size, play in the standard deviation of the distribution of the sample mean? As the size of the sample gets larger, we do not expect as much spread in the sample means since larger observations will offset smaller observations Pearson Prentice Hall. All rights reserved 8-17

18 Parallel Example 2: The Impact of Sample Size on Sampling Variability Approximate the sampling distribution of the sample mean by obtaining 200 simple random samples of size n = 20 from the population of weights of pennies minted after 1982 (µ = 2.46 grams and σ = 0.02 grams) 2010 Pearson Prentice Hall. All rights reserved 8-18

19 The mean of the 200 sample means for n = 20 is still 2.46, but the standard deviation is now ( for n = 5). As expected, there is less variability in the distribution of the sample mean with n = 20 than with n = Pearson Prentice Hall. All rights reserved 8-19

20 The Mean and Standard Deviation of the Sampling Distribution of Suppose that a simple random sample of size n is drawn from a large population with mean µ and standard deviation σ. The sampling distribution of will have mean and standard deviation. The standard deviation of the sampling distribution of is called the standard error of the mean and is denoted Pearson Prentice Hall. All rights reserved 8-20

21 Determine from the given parameters of the population and the sample size. µ = 84 σ = 12 n = 30 A. 12 B C. 84 D Pearson Prentice Hall. All rights reserved 8-21

22 Determine from the given parameters of the population and the sample size. µ = 84 σ = 12 n = 30 A. 12 B C. 84 D Pearson Prentice Hall. All rights reserved 8-22

23 Determine from the given parameters of the population and the sample size. µ = 84 σ = 12 n = 30 A. 12 B C D Pearson Prentice Hall. All rights reserved 8-23

24 Determine from the given parameters of the population and the sample size. µ = 84 σ = 12 n = 30 A. 12 B C D Pearson Prentice Hall. All rights reserved 8-24

25 The Shape of the Sampling Distribution of If X is Normal If a random variable X is normally distributed, the distribution of the sample mean is normally distributed Pearson Prentice Hall. All rights reserved 8-25

26 Parallel Example 3: Describing the Distribution of the Sample Mean The weights of pennies minted after 1982 are approximately normally distributed with mean 2.46 grams and standard deviation 0.02 grams. What is the probability that in a simple random sample of 10 pennies minted after 1982, we obtain a sample mean of at least grams? 2010 Pearson Prentice Hall. All rights reserved 8-26

27 Solution is normally distributed with =2.46 and.. P(Z>0.79)= = Pearson Prentice Hall. All rights reserved 8-27

28 IQ scores are normally distributed with a mean of 100 and a standard deviation of 15. What is the probability a random sample of 20 people have a mean IQ score greater than 110? A B C D Pearson Prentice Hall. All rights reserved 8-28

29 IQ scores are normally distributed with a mean of 100 and a standard deviation of 15. What is the probability a random sample of 20 people have a mean IQ score greater than 110? A B C D Pearson Prentice Hall. All rights reserved 8-29

30 Home sizes in Anytown, USA have a mean of 2400 square feet and a standard deviation of 450 square feet. What is the probability that a random sample of 50 homes in Anytown, USA has a mean square footage less than 2200 square feet? A B C D Pearson Prentice Hall. All rights reserved 8-30

31 Home sizes in Anytown, USA have a mean of 2400 square feet and a standard deviation of 450 square feet. What is the probability that a random sample of 50 homes in Anytown, USA has a mean square footage less than 2200 square feet? A B C D Pearson Prentice Hall. All rights reserved 8-31

32 Objective 2 Describe the Distribution of the Sample Mean- Samples from a Population That is Not Normal 2010 Pearson Prentice Hall. All rights reserved 8-32

33 Parallel Example 4: Sampling from a Population that is Not Normal The following table and histogram give the probability distribution for rolling a fair die: Face on Die Relative Frequency µ =3.5, σ = Note that the population distribution is NOT normal 2010 Pearson Prentice Hall. All rights reserved 8-33

34 Estimate the sampling distribution of by obtaining 200 simple random samples of size n=4 and calculating the sample mean for each of the 200 samples. Repeat for n = 10 and 30. Histograms of the sampling distribution of the sample mean for each sample size are given on the next slide Pearson Prentice Hall. All rights reserved 8-34

35 2010 Pearson Prentice Hall. All rights reserved 8-35

36 2010 Pearson Prentice Hall. All rights reserved 8-36

37 2010 Pearson Prentice Hall. All rights reserved 8-37

38 Key Points from Example 4 The mean of the sampling distribution is equal to the mean of the parent population and the standard deviation of the sampling distribution of the sample mean is regardless of the sample size. The Central Limit Theorem: the shape of the distribution of the sample mean becomes approximately normal as the sample size n increases, regardless of the shape of the population Pearson Prentice Hall. All rights reserved 8-38

39 Parallel Example 5: Using the Central Limit Theorem Suppose that the mean time for an oil change at a 10-minute oil change joint is 11.4 minutes with a standard deviation of 3.2 minutes. (a) If a random sample of n = 35 oil changes is selected, describe the sampling distribution of the sample mean. (b) If a random sample of n = 35 oil changes is selected, what is the probability the mean oil change time is less than 11 minutes? 2010 Pearson Prentice Hall. All rights reserved 8-39

40 Parallel Example 5: Using the Central Limit Theorem Suppose that the mean time for an oil change at a 10-minute oil change joint is 11.4 minutes with a standard deviation of 3.2 minutes. (a) If a random sample of n = 35 oil changes is selected, describe the sampling distribution of the sample mean. Solution: is approximately normally distributed with mean=11.4 and std. dev. =. (b) If a random sample of n = 35 oil changes is selected, what is the probability the mean oil change time is less than 11 minutes? Solution:, P(Z<-0.74)= Pearson Prentice Hall. All rights reserved 8-40

41 Section 8.2 Distribution of the Sample Proportion 2010 Pearson Prentice Hall. All rights reserved

42 Objectives 1. Describe the sampling distribution of a sample proportion 2. Compute probabilities of a sample proportion 2010 Pearson Prentice Hall. All rights reserved 8-42

43 Objective 1 Describe the Sampling Distribution of a Sample Proportion 2010 Pearson Prentice Hall. All rights reserved 8-43

44 Point Estimate of a Population Proportion Suppose that a random sample of size n is obtained from a population in which each individual either does or does not have a certain characteristic. The sample proportion, denoted (read p-hat ) is given by where x is the number of individuals in the sample with the specified characteristic. The sample proportion is a statistic that estimates the population proportion, p Pearson Prentice Hall. All rights reserved 8-44

45 Parallel Example 1: Computing a Sample Proportion In a Quinnipiac University Poll conducted in May of 2008, 1,745 registered voters nationwide were asked whether they approved of the way George W. Bush is handling the economy. 349 responded yes. Obtain a point estimate for the proportion of registered voters who approve of the way George W. Bush is handling the economy Pearson Prentice Hall. All rights reserved 8-45

46 Parallel Example 1: Computing a Sample Proportion In a Quinnipiac University Poll conducted in May of 2008, 1,745 registered voters nationwide were asked whether they approved of the way George W. Bush is handling the economy. 349 responded yes. Obtain a point estimate for the proportion of registered voters who approve of the way George W. Bush is handling the economy. Solution: 2010 Pearson Prentice Hall. All rights reserved 8-46

47 Parallel Example 2: Using Simulation to Describe the Distribution of the Sample Proportion According to a Time poll conducted in June of 2008, 42% of registered voters believed that gay and lesbian couples should be allowed to marry. Describe the sampling distribution of the sample proportion for samples of size n=10, 50, Pearson Prentice Hall. All rights reserved 8-47

48 2010 Pearson Prentice Hall. All rights reserved 8-48

49 2010 Pearson Prentice Hall. All rights reserved 8-49

50 2010 Pearson Prentice Hall. All rights reserved 8-50

51 Key Points from Example 2 Shape: As the size of the sample, n, increases, the shape of the sampling distribution of the sample proportion becomes approximately normal. Center: The mean of the sampling distribution of the sample proportion equals the population proportion, p. Spread: The standard deviation of the sampling distribution of the sample proportion decreases as the sample size, n, increases Pearson Prentice Hall. All rights reserved 8-51

52 Sampling Distribution of For a simple random sample of size n with population proportion p: The shape of the sampling distribution of is approximately normal provided np(1-p) 10. The mean of the sampling distribution of is. The standard deviation of the sampling distribution of is 2010 Pearson Prentice Hall. All rights reserved 8-52

53 Determine from the given parameters. Assume the size of the population is 25,000. n = 200 p = 0.75 A B C D Pearson Prentice Hall. All rights reserved 8-53

54 Determine from the given parameters. Assume the size of the population is 25,000. n = 200 p = 0.75 A B C D Pearson Prentice Hall. All rights reserved 8-54

55 Sampling Distribution of The model on the previous slide requires that the sampled values are independent. When sampling from finite populations, this assumption is verified by checking that the sample size n is no more than 5% of the population size N (n 0.05N). Regardless of whether np(1 p) 10 or not, the mean of the sampling distribution of is p, and the standard deviation is 2010 Pearson Prentice Hall. All rights reserved 8-55

56 Determine from the given parameters. Assume the size of the population is 25,000. n = 200 p = 0.75 A B C D Pearson Prentice Hall. All rights reserved 8-56

57 Determine from the given parameters. Assume the size of the population is 25,000. n = 200 p = 0.75 A B C D Pearson Prentice Hall. All rights reserved 8-57

58 Parallel Example 3: Describing the Sampling Distribution of the Sample Proportion According to a Time poll conducted in June of 2008, 42% of registered voters believed that gay and lesbian couples should be allowed to marry. Suppose that we obtain a simple random sample of 50 voters and determine which believe that gay and lesbian couples should be allowed to marry. Describe the sampling distribution of the sample proportion for registered voters who believe that gay and lesbian couples should be allowed to marry Pearson Prentice Hall. All rights reserved 8-58

59 Solution The sample of n = 50 is smaller than 5% of the population size (all registered voters in the U.S.). Also, np(1-p) = 50(0.42)(0.58) = The sampling distribution of the sample proportion is therefore approximately normal with mean=0.42 and standard deviation =. (Note: this is very close to the standard deviation of found using simulation in Example 2.) 2010 Pearson Prentice Hall. All rights reserved 8-59

60 Objective 2 Compute Probabilities of a Sample Proportion 2010 Pearson Prentice Hall. All rights reserved 8-60

61 Parallel Example 4: Compute Probabilities of a Sample Proportion According to the Centers for Disease Control and Prevention, 18.8% of school-aged children, aged 6-11 years, were overweight in (a) In a random sample of 90 school-aged children, aged 6-11 years, what is the probability that at least 19% are overweight? (b) Suppose a random sample of 90 school-aged children, aged 6-11 years, results in 24 overweight children. What might you conclude? 2010 Pearson Prentice Hall. All rights reserved 8-61

62 Solution n = 90 is less than 5% of the population size np(1-p) = 90(.188)(1-.188) is approximately normal with mean = and standard deviation = (a) In a random sample of 90 school-aged children, aged 6-11 years, what is the probability that at least 19% are overweight?, P(Z > 0.05)= = Pearson Prentice Hall. All rights reserved 8-62

63 Solution is approximately normal with mean = and standard deviation = (b) Suppose a random sample of 90 school-aged children, aged 6-11 years, results in 24 overweight children. What might you conclude? P(Z > 1.91) = = , We would only expect to see about 3 samples in 100 resulting in a sample proportion of or more. This is an unusual sample if the true population proportion is Pearson Prentice Hall. All rights reserved 8-63

64 Sixteen percent of Americans do not have health insurance. Suppose a simple random sample of 500 Americans is obtained. In a random sample of 500 Americans, what is the probability that more than 20% do not have health insurance? A B C D Pearson Prentice Hall. All rights reserved 8-64

65 Sixteen percent of Americans do not have health insurance. Suppose a simple random sample of 500 Americans is obtained. In a random sample of 500 Americans, what is the probability that more than 20% do not have health insurance? A B C D Pearson Prentice Hall. All rights reserved 8-65

Chapter. Estimating the Value of a Parameter Using Confidence Intervals Pearson Prentice Hall. All rights reserved

Chapter. Estimating the Value of a Parameter Using Confidence Intervals Pearson Prentice Hall. All rights reserved Chapter 9 Estimating the Value of a Parameter Using Confidence Intervals 2010 Pearson Prentice Hall. All rights reserved Section 9.1 The Logic in Constructing Confidence Intervals for a Population Mean

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