Question

It is known that in certain district the police officers have a mean physical fitness rating of 73 on a 100- point physical endurance rating scale and the standard deviation of 8. A new police chief wants to find out if in his district the police officers have a larger mean physical fitness rating. Therefore, he selects a random sample of 69 local police officers and finds that the mean is 74. Was he right?(show work: NULL and ALTERNATIVE HYPOTHESIS; summarize the data into a single TEST STATISTICS and determine the likelihood the TEST STATISTICS would be if the NULL is TRUE using test statistics or p-value approach. DECISION ABOUT NULL AND CONCLUSION ABOUT ORIGINAL QUESTION)

Answer #1

A community psychologist selects a sample of 16 local police
officers to test whether their physical endurance is better than
the median score of 72. She measures their physical endurance on a
100-point physical endurance rating scale.
Performance Scores 79 56 86 87 75 83 89 92 95 90 85 73 76 70 52
64 Based on the data given above, compute the one-sample sign test
at a 0.05 level of significance.
x = 0.05
State whether to retain or...

7.
(07.02 MC)
Oscar, a yoga instructor at Yoga for You, is interested in
comparing levels of physical fitness of students attending a nearby
high school and those attending a local community college. He
selects a random sample of 210 students from the high school. The
mean and standard deviation of their fitness scores are 82 and 14,
respectively. He also selects a random sample of 210 students from
the local community college. The mean and standard deviation of
their...

The data are not actual data, but are modeled after data
collected by Trautwein and Ammerman (2013) for a study on the
effects of cochlear implants (CI) on the language, speech, and
perception skills of 32 deaf children: 16 subjects with at least
one cochlear implant (CI) and 16 subjects (with hearing loss)
without an implant. (CI subjects were implanted at 13 or 14 months
of age. So, no subjects had CIs at the time of the first data
collection.)...

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