A recent national survey found that high school students watched an average (mea
ID: 3252831 • Letter: A
Question
A recent national survey found that high school students watched an average (mean) of 7.5 DVDs per month with a population standard deviation of .90. A random sample of 38 college students revealed that the mean number of DVDs watched last month was 7.00. At the .05 significance level, can we conclude that college students watch fewer DVDs a month than high school students?
H0: 7.5 ; H1: > 7.5
H0: = 7.5 ; H1: 7.5
H0: > 7.5 ; H1: = 7.5
H0: 7.5 ; H1: < 7.5
Reject H0 if z > -1.65
Reject H1 if z > -1.65
Reject H1 if z < -1.65
Reject H0 if z < -1.65
A recent national survey found that high school students watched an average (mean) of 7.5 DVDs per month with a population standard deviation of .90. A random sample of 38 college students revealed that the mean number of DVDs watched last month was 7.00. At the .05 significance level, can we conclude that college students watch fewer DVDs a month than high school students?
Explanation / Answer
(a)
H0: 7.5 ;
H1: < 7.5
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(b)
Reject H0 if z < -1.65