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1. The probability is .80 that a standard normal random variable is between -z and +z. The value of z is approximate? a. 1.28 b.

1. The probability is .80 that a standard normal random variable is between -z and +z. The value of z is approximate?

a. 1.28

b. 1.35

c. 1.45

d. 1.96

2. A sample of 16 ATM transactions shows a mean transaction time of 67 seconds with a standard deviation of 12 seconds. State the hypotheses to test whether the mean transaction time exceeds 60 seconds

a. H0: 60, H1: >60

b. H0: < 60, H1: >=60

c. H0: = 60, H1: 60

d. H0: 60, H1: <60

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