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Author Question: A certain population is bimodal. We want to estimate its mean, so we will collect a sample. Which ... (Read 407 times)

mmm

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on: Aug 30, 2019

Question 1

We have calculated a confidence interval based on a sample of size n = 100. Now we want to get a better estimate with a margin of error that is only one-fourth as large. How large does our new sample need to be?
◦ 200
◦ 1600
◦ 25
◦ 50
◦ 400

Question 2

A certain population is bimodal. We want to estimate its mean, so we will collect a sample. Which should be true if we use a large sample rather than a small one?
I.   The distribution of our sample data will be clearly bimodal.
II.  The sampling distribution of the sample means will be approximately normal.
III. The variability of the sample means will be smaller.
◦ I only
◦ I, II, and III
◦ III only
◦ II only
◦ II and III
Stats: Modeling the World ¦ Bock, Velleman, De Veaux ¦ 4th Edition
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Marked as best answer by mmm on Aug 30, 2019

ynlevi

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Reply #1 on: Aug 30, 2019
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mmm

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Reply #2 on: Aug 30, 2019
Thank you!


ynlevi

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Reply #3 on: Aug 30, 2019
Always glad to help...


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