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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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