Statistics
Test 3
Prof. VanderHoff
Spring 2007
All work must be shown on exam to receive credit.
1 [12] Do you conclude that the proportion of men who believe in global warming [GW] is the same as the
proportion of women who believe in GW? Circle either Yes or No.
Test the hypothesis that the proportion
of students men believe in GW equals the proportion of women who believe in GW.
Use a .05
significance level, a two tail test and the following data:
numbers
men
women
surveyed
100
80
Believe in GW
45
25
2 [13] Are the means for men and women equals? Test the null hypothesis that the mean for men is equal to
the mean for women.
Use .05 significance level, a two tail test and the following data:
sample
men
women
mean
90
86
variance
10
88
number
50
60
3 [10 Do the proportion of students who believe in global warming exceed .6?
Circle either Yes or No.
A
sample of 50 students has 39 GW believers. Test the hypothesis that the proportion of students who believe
in global warming is greater than or equal to .6 using a .05 significance level.
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 Spring '10
 VANDERHOFF
 Statistics, Global Warming, Mean, Null hypothesis, Statistical hypothesis testing, Statistical power

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