Question

A randomly selected 14 people were asked how long they slept at night. The mean time was 5.5 hours, and the standard deviation was 0.77 hour. Find the 80% confidence interval of the mean time. Assume the variable is normally distributed. a. The $t_{\alpha/2}$ at 80% confidence level is equal to: b. Find the best point estimate of the population mean.

          A randomly selected 14 people were asked how long they slept at night. The mean time was 5.5 hours, and the standard deviation was 0.77 hour. Find the 80% confidence interval of the mean time. Assume the variable is normally distributed.
a. The $t_{\alpha/2}$ at 80% confidence level is equal to:
b. Find the best point estimate of the population mean.

A randomly selected 14 people were asked how long they slept at night. The mean time was 5.5 hours, and the standard deviation was 0.77 hour. Find the 80% confidence interval of the mean time. Assume the variable is normally distributed.
a. The tα/2 at 80% confidence level is equal to:
b. Find the best point estimate of the population mean.

Added by Amy K.

Elementary Statistics a Step by Step Approach

Allan G. Bluman 9th Edition

Instant Answer

Solved by Expert Ivan Kochetkov

10/07/2023

Step 1

Step 1: The sample size is n = 14, so the degrees of freedom are df = n - 1 = 13. Show more…

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A randomly selected 14 people were asked how long they slept at night. The mean time was 5.5 hours, and the standard deviation was 0.77 hour. Find the 80% confidence interval of the mean time. Assume the variable is normally distributed. a. The $t_{\alpha/2}$ at 80% confidence level is equal to: b. Find the best point estimate of the population mean.