**Question 20:**A very large population has a mean of 55 and a standard deviation of 8. One day a sample of 40 observations is taken. On another day a sample of 100 observations is taken. Which of the following is true?- ☐ The standard error of the mean will be smaller with 40 observations.- ☐ The standard error of the mean will be larger with 40 observations.- ☐ The standard error of the mean will be the same with either 40 or 100 observations.- ☐ It is impossible to determine any of the above given the available information.

Answered: 20. A very large population has a mean…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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The life of a butterfly is normally distributed with a mean of 50 days. You took a random sample of 25 such butterflies. The mean life for this sample is 47 days a standard deviation of 3 days. At α = 0.05. a. Test to see if the average life of a butterfly is different from 50 days. b. Your friend believes that the life of a butterfly is less than 50 days. Is she correct?
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