The times to pop a 3.4-ounce bag of microwave popcorn without burning it are Normally distributed with a mean time of 140 seconds and a standard deviation of 20 seconds. A random sample of four bags is selected and the mean time to pop the bags is recorded. Which of the following describes the sampling distribution of all possible samples of size four? approximately Normal with a mean of 70 seconds and a standard deviation of 5 seconds approximately Normal with a mean of 70 seconds and a standard deviation of 20 seconds approximately Normal with a mean of 140 seconds and a standard deviation of 20 seconds approximately Normal with a mean of 140 seconds and a standard deviation of 10 seconds

MATLAB: An Introduction with Applications
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Author:Amos Gilat
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Chapter1: Starting With Matlab
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The times to pop a 3.4-ounce bag of microwave popcorn without burning it are Normally distributed with a mean time of
140 seconds and a standard deviation of 20 seconds. A random sample of four bags is selected and the mean time to
pop the bags is recorded. Which of the following describes the sampling distribution of all possible samples of size
four?
approximately Normal with a mean of 70 seconds and a standard deviation of 5 seconds
approximately Normal with a mean of 70 seconds and a standard deviation of 20 seconds
approximately Normal with a mean of 140 seconds and a standard deviation of 20 seconds
approximately Normal with a mean of 140 seconds and a standard deviation of 10 seconds
12
Transcribed Image Text:The times to pop a 3.4-ounce bag of microwave popcorn without burning it are Normally distributed with a mean time of 140 seconds and a standard deviation of 20 seconds. A random sample of four bags is selected and the mean time to pop the bags is recorded. Which of the following describes the sampling distribution of all possible samples of size four? approximately Normal with a mean of 70 seconds and a standard deviation of 5 seconds approximately Normal with a mean of 70 seconds and a standard deviation of 20 seconds approximately Normal with a mean of 140 seconds and a standard deviation of 20 seconds approximately Normal with a mean of 140 seconds and a standard deviation of 10 seconds 12
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