Evaluation 1. A population has mean 75 and standard deviation 12. a. Random samples of size 121 are taken. Find the mean and standard deviation of sampling distribution of the means? b. How would the answers to part (a) change if the size of the samples were 400 instead of 121? 2. The scores of individual students on a national test have a normal distribution with mean 18.6 and standard deviation 5.9. At Federico Ramos Rural High School, 76 students took the test. If the scores at this school have the same distribution as national scores, what are the (a) mean and (b) standard deviation of the sample mean for 76 students?

MATLAB: An Introduction with Applications
6th Edition
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Author:Amos Gilat
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Evaluation
1. A population has mean 75 and standard deviation 12.
a. Random samples of size 121 are taken. Find the mean and standard deviation of sampling
distribution of the means?
b. How would the answers to part (a) change if the size of the samples were 400 instead of 121?
2. The scores of individual students on a national test have a normal distribution with mean 18.6 and
standard deviation 5.9. At Federico Ramos Rural High School, 76 students took the test. If the scores
at this school have the same distribution as national scores, what are the (a) mean and (b) standard
deviation of the sample mean for 76 students?
Transcribed Image Text:Evaluation 1. A population has mean 75 and standard deviation 12. a. Random samples of size 121 are taken. Find the mean and standard deviation of sampling distribution of the means? b. How would the answers to part (a) change if the size of the samples were 400 instead of 121? 2. The scores of individual students on a national test have a normal distribution with mean 18.6 and standard deviation 5.9. At Federico Ramos Rural High School, 76 students took the test. If the scores at this school have the same distribution as national scores, what are the (a) mean and (b) standard deviation of the sample mean for 76 students?
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