question:: The average yearly rainfall in the Sahara desert used to be 10 inches

Question

question::

The average yearly rainfall in the Sahara desert used to be 10 inches. A climatologist believes that amount has changed.

Ho: = 10
Ha: 10

The climatologist takes a sample of 20 recent yearly rainfall records and obtains an average of 10.3 inches. Suppose the population is normal and the associated test statistic is T = 1.59719.

Find the P-value.

Complete the following sentence:
The confidence interval corresponding to this test would be a
% confidence interval. (Use a whole number.)

We can also reach the same conclusion by examining a confidence interval to determine whether or not the null hypothesis should be rejected. What number would you look for within the confidence interval?

Suppose we did a right-tailed test instead of this one. What would the new P-value be?
P-value =

thank you!

Explanation / Answer

p-value = 0.126

you have to provide an alpha value to find the confidence interval.

new p-value = 0.063

Related Questions

Navigate

• Browse (All)
• Browse Q
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.