Question

1) Which of the following is NOT a categorical variable?                 a.            your age on...

1) Which of the following is NOT a categorical variable?

                a.            your age on your last birthday

                b.            your cell phone area code

                c.             your accounting class start time

                d.            your high school graduation year

A population has a mean of 180 and a standard deviation of 24. A sample of 64 observations will be taken. The probability that the mean from that sample will be between 174 and 177 is

                a.            0.1359                   b.            0.8185                                  c.             0.3413                  d.            0.4772

A population has a mean of 53 and a standard deviation of 21. A sample of 49 observations will be taken. The probability that the sample mean will be greater than 48.05 is

                a.            0

                b.            .0495

                c.             .4505

                d.            None of the alternative answers is correct.

Four hundred registered voters were randomly selected asked whether gun laws should be changed. Three hundred said "yes," and one hundred said "no." The point estimate of the proportion in the population who will respond "yes" is

                a.            300

                b.            approximately 300

                c.             0.75

                d.            0.25

Math   Statistics-And-Probability   
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