2. A district supervisor of a certain school surveyed 28 randomly selected teachers and found that they work an average of 42.6 hours a week and the standard deviation was 3.75 hours.

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.4: Distributions Of Data
Problem 19PFA
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Answer number 2 only. 

I. Determine the appropriate test statistics (z-test, t-test or f-test) that will be applied for each of the
following problem statements. Write your answer on the space provided.
1. A sample of 70 observations was selected from a normal population. The sample mean is 2.78
and the sample standard deviation is 0.83. Another sample of 58 observations was selected
from a normal population. The mean sample is 2.63 and the sample standard deviation is 0.75.
2. A district supervisor of a certain school surveyed 28 randomly selected teachers and found
that they work an average of 42.6 hours a week and the standard deviation was 3.75 hours.
3. A researcher randomly selected a sample of 550 residents and found that 495 of them do
have household pets.
Transcribed Image Text:I. Determine the appropriate test statistics (z-test, t-test or f-test) that will be applied for each of the following problem statements. Write your answer on the space provided. 1. A sample of 70 observations was selected from a normal population. The sample mean is 2.78 and the sample standard deviation is 0.83. Another sample of 58 observations was selected from a normal population. The mean sample is 2.63 and the sample standard deviation is 0.75. 2. A district supervisor of a certain school surveyed 28 randomly selected teachers and found that they work an average of 42.6 hours a week and the standard deviation was 3.75 hours. 3. A researcher randomly selected a sample of 550 residents and found that 495 of them do have household pets.
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