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Q1) Find out value of α as shown in figure below, if degrees of freedom were seven and nine.
A) 0.1
B) 0.01
C) 0.025
D) 0.05
Q2) A pharmaceutical company is testing effectiveness of new drug for lowering cholesterol. As part of this trial, they want to find out whether there is a difference between effectiveness for women and for men. At = .05, what is the test value?
Women
Men
Sample size
40
70
Mean effect
7
6.75
Sample variance
2.5
4.5
A) 0.70
B) 1.97
C) 0.36
D) 1.42
Q3) In testing equality of two means below, find out the test statistic? (Use the unequal variances formula)
Sample 1
Sample 2
9
12
Sample mean
80
115
550
100
A) -4.20
B) -2.31
C) -0.18
D) -0.50
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