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Author Question: A random sample of 80 observations produced a mean = 35.4 and a standard deviation s = 3.1. a. Find ... (Read 73 times)

neverstopbelieb

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on: Feb 14, 2020

Question 1

A random sample of n = 144 measurements was selected from a population with unknown mean μ and standard deviation σ. Calculate a 90% confidence interval if = 3.55 and s = .49.

Question 2

A random sample of 80 observations produced a mean = 35.4 and a standard deviation s = 3.1.  
 
a. Find a 90% confidence interval for the population mean μ.
b. Find a 95% confidence interval for μ.
c. Find a 99% confidence interval for μ.
d. What happens to the width of a confidence interval as the value of the confidence coefficient is increased while the sample size is held fixed?
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Marked as best answer by neverstopbelieb on Feb 14, 2020

gasdhashg

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Reply #1 on: Feb 14, 2020
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neverstopbelieb

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Reply 2 on: Feb 14, 2020
YES! Correct, THANKS for helping me on my review

okolip

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Reply 3 on: Yesterday
Thanks for the timely response, appreciate it

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