A: Is this a one-tail or a two-tail test? B: What is the alpha level of this test? C: What is the z-critical value?

Holt Mcdougal Larson Pre-algebra: Student Edition 2012
1st Edition
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL
Chapter11: Data Analysis And Probability
Section11.4: Collecting Data
Problem 3E
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The physical fitness score for a population of police officers at a local police station is 73, with an SD of 8 on a
100-point physical endurance scale. Suppose the police chief selects a sample of 64 local police officers from
this population and records a mean physical fitness rating on this scale equal to 75. He conducts a single-
sample z test to determine whether physical endurance increased for this group.
A: Is this a one-tail or a two-tail test?
B: What is the alpha level of this test?
C: What is the z-critical value?
D: What is the z-obtained value?
E. What is the decision? (answer options: reject null or retain null)
Transcribed Image Text:The physical fitness score for a population of police officers at a local police station is 73, with an SD of 8 on a 100-point physical endurance scale. Suppose the police chief selects a sample of 64 local police officers from this population and records a mean physical fitness rating on this scale equal to 75. He conducts a single- sample z test to determine whether physical endurance increased for this group. A: Is this a one-tail or a two-tail test? B: What is the alpha level of this test? C: What is the z-critical value? D: What is the z-obtained value? E. What is the decision? (answer options: reject null or retain null)
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