Please use the following information to answer questions 7d-7e: The librarian at the local elementary school claims that, on average, the books in the library are more than 20 years old. To test this claim, a student takes a sample of n = 30 books and records the publication date for each. The sample produces an average of x̅ = 23.8 years with a variance of s2 = 67.5. Determine whether the average age of the library books is significantly greater than 20 years. Use a one-tailed test with α = .01.      7d. Based on the calculated test statistic, would you reject the null hypothesis established in question 7a (MUST SHOW WORK FOR THIS PROBLEM)? Group of answer choices: a. yes b. no       7e. Based on the previously conducted steps, we can conclude (MUST SHOW WORK FOR THIS PROBLEM):  Group of answer choices: a. The average age of the library books is significantly less than 20 years. b. The average age of the library books is significantly greater than 20 years. c. The average age of the library books is significantly different than 20 years. d. The average age of the library books is approximately 20 years.

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Please use the following information to answer questions 7d-7e:

The librarian at the local elementary school claims that, on average, the books in the library are more than 20 years old. To test this claim, a student takes a sample of = 30 books and records the publication date for each. The sample produces an average of x̅ = 23.8 years with a variance of s2 = 67.5.

Determine whether the average age of the library books is significantly greater than 20 years. Use a one-tailed test with α = .01. 

 
 
7d. Based on the calculated test statistic, would you reject the null hypothesis established in question 7a (MUST SHOW WORK FOR THIS PROBLEM)?
Group of answer choices:
a. yes
b. no
 
 
 
7e. Based on the previously conducted steps, we can conclude (MUST SHOW WORK FOR THIS PROBLEM): 
Group of answer choices:
a. The average age of the library books is significantly less than 20 years.
b. The average age of the library books is significantly greater than 20 years.
c. The average age of the library books is significantly different than 20 years.
d. The average age of the library books is approximately 20 years.
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