Conditional probability of the event and type I error.

1. If A and B are independent events with P(A) = 0.25 and P(B) = 0.60, then P(A/B) is:

a) 0.25

b) 0.60

c) 0.35

d) 0.85

2. Two samples of sizes 25 and 35 are independently drawn from two normal populations, where the unknown population variances are assumed to be equal. The number of degrees of freedom of the equal-variances t test statistic is:

a) 60

b) 59

c) 58

d) 35

3. In a criminal trial, a Type I error is made when:

a) a guilty defendant is acquitted

b) an innocent person is convicted

c) a guilty defendant is convicted

d) an innocent person is acquitted

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