Question

Use the​ one-mean t-interval procedure with the sample​ mean, sample​ size, sample standard​ deviation, and confidence level given below to find a confidence interval for the mean of the population from which the sample was drawn.

sample mean=3.0 n=41 s=5.4 confidence level=90​%

The 90​% confidence interval about μ is ?? to ???

Answer 1

From the given information we want to find 90% confidence interval for population mean ( ).

Using minitab:

Step 1) Click on Stat>>>Basic Statistics >>1 sample t...

Select summarized data

Sample size: 41

Mean: 3.0

Standard deviation: 5.4

Step 2) Click on Option

Confidence level = 90

Alternative: Not equal

Then click on OK

Again Click on OK

Then we get the following output

From the above output the 90% confidence interval for is 1.580 to 4.420