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In: Statistics and Probability

Identify the critical t. An independent random sample is selected from an approximately normal population with...

Identify the critical t. An independent random sample is selected from an approximately normal population with unknown standard deviation. Find the degrees of freedom and the critical t value ?∗t∗ for the given sample size and confidence level. Round critical t values to 4 decimal places.

Sample size, n Confidence level Degree of Freedom Critical value, ?∗t∗
12 90
15 95
26 98
28 99

Solutions

Expert Solution

The answer is:

Sample size, n Confidence level Degree of Freedom Critical value, ?∗
12 90 11 1.7959
15 95 14 2.1448
26 98 25 2.4851
28 99 27 2.7707

You can either use Excel or the following t table extract to find the critical value:

Excel Formulas:

Let me know in the comments if anything is not clear. I will reply ASAP! Please do upvote if satisfied!

orchestra answered 2 years ago
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