Solution Found!
Solution: Using Correct Distribution. In Exercise, assume
Chapter 7, Problem 6BSC(choose chapter or problem)
Using Correct Distribution. In Exercises 5–8, assume that we want to construct a confidence interval. Do one of the following, as appropriate: (a) Find the critical value \(\mathrm {t\ \alpha\ /\ 2}\) , (b) find the critical value \(\mathrm {z\ \alpha\ /\ 2}\) , (c) state that neither the normal distribution nor the t distribution applies.
Confidence level is 90%, \(\sigma\) is not known, and the dotplot of IQ scores of 20 randomly selected statistics instructors is as shown below.
Equation Transcription:
Text Transcription:
t alpha / 2
z alpha / 2
sigma
Questions & Answers
QUESTION:
Using Correct Distribution. In Exercises 5–8, assume that we want to construct a confidence interval. Do one of the following, as appropriate: (a) Find the critical value \(\mathrm {t\ \alpha\ /\ 2}\) , (b) find the critical value \(\mathrm {z\ \alpha\ /\ 2}\) , (c) state that neither the normal distribution nor the t distribution applies.
Confidence level is 90%, \(\sigma\) is not known, and the dotplot of IQ scores of 20 randomly selected statistics instructors is as shown below.
Equation Transcription:
Text Transcription:
t alpha / 2
z alpha / 2
sigma
ANSWER:
Solution 6BSC
a)
Compute the critical value for
Here the given sample size is , so the corresponding degrees of freedom to finding the critical value is,
