Textbook ExpertVerified Tutor
23 Nov 2021
Given information
Instructions: For the following ten exercises,
Hypothesis testing: For the following ten exercises, answer each question.
State the null and alternate hypotheses.
State the p-value.
. State alpha.
. What is your decision?
Write a conclusion.
Answer any other questions asked in the problem.
The Weather Underground reported that the mean amount of summer rainfall for the northeastern US is at least inches. Ten cities in the northeast are randomly selected and the mean rainfall amount is calculated to be inches with a standard deviation of 1.3 inches.
Step-by-step explanation
Step 1.
The null hypothesis states that mean rainfall is greater than or equal to the reported average inches.
In symbols:
The alternative hypothesis states that mean rainfall is less than the reported average inches.
In symbols:
The degree of freedom is calculated as follows:
Now, the test static is calculated as follows:
By using excel function , the p-value is:
Since and also, reject the null hypothesis at and both. We can conclude that mean rainfall is less than the reported average inches.
Hence, the null hypothesis is rejected, we can conclude that mean rainfall is less than the reported average inches.
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