Question

It is believed that the mean height of middle school students who play basketball on the

school team is 71.5 inches. A random sample of 40 players is chosen. The sample mean was 71

inches, and the sample standard deviation was 1.7 inches. Do the data support the claim that the

mean height is less than 71.5 inches? Test at level of significance α=5%.

Answer #1

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The population standard deviation for the height of high school
basketball players is 1.9 inches. If we want to be 95% confident
that the sample mean height is within 0.8 inch of the true
population mean height, how many randomly selected students must be
surveyed? Fill in the blank: n=

The population standard deviation for the height of high school
basketball players is 2.5 inches. If we want to be 95% confident
that the sample mean height is within 0.4 inch of the true
population mean height, how many randomly selected students must be
surveyed?
Fill in the blank: n=

The population standard deviation for the height of high school
basketball players is 4.6 inches. If we want to be 95% confident
that the sample mean height is within 0.4 inch of the true
population mean height, how many randomly selected students must be
surveyed?
Fill in the blank: n=

#2.
A random sample of 25 professional basketball players shows a
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If the sample were smaller, would the confidence interval
become smaller or larger? Explain.
If you wanted a higher level of confidence (99%) would the
confidence interval become smaller or larger? Explain.

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Four basketball teams took a random sample of players
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Team 1
Team 2
Team 3
Team 4
Team 5
36
32
48
38
41
42
35
50
44
39
51
38
39
46
40
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a. Yes there is
b. No there isn't

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A college claims that commute times to
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