Suppose the mean life of an animal is 8 years with a standard deviation 1 year. Find the probability that the mean life for a sample of 15 animals is at most 8.5 years. a. .026 b. .6915 c. .6878 d. .974 e. None of the other 4 Suppose that in a certain region of the country the standard deviation of the duration of first marriages that end in divorce is 1.2 years. You took a sample of 25 divorces and found that the mean duration of marriage for this sample is 8.5 years. Prepare a 95% confidence interval for the duration of first marriage that ends in a divorce. (7.96,8.74) (8.03,8.97) (6.39,10.31) (8.09,8.61) None of the other 4 answers. The standard deviation of the number of hours worked per week is 2 hours. A professor monitors time spent studying for the course per week in his class. In a sample of 16 students, the average amount of time spent for a course per week is 5 hours. Construct a 96% confidence interval for the mean time spent studying for a course. (4.12,5.88) (4.18,5.82) (4.02,5.98) (3.97,6.03) None of the other 4 answers
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Suppose the mean life of an animal is 8 years with a standard deviation 1 year. Find the probability that the mean life for a sample of 15 animals is at most 8.5 years.
a. .026
b. .6915
c. .6878
d. .974
e. None of the other 4
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Suppose that in a certain region of the country the standard deviation of the duration of first marriages that end in divorce is 1.2 years. You took a sample of 25 divorces and found that the mean duration of marriage for this sample is 8.5 years. Prepare a 95% confidence interval for the duration of first marriage that ends in a divorce.
(7.96,8.74)
(8.03,8.97)
(6.39,10.31)
(8.09,8.61)
None of the other 4 answers.
The standard deviation of the number of hours worked per week is 2 hours. A professor monitors time spent studying for the course per week in his class. In a sample of 16 students, the average amount of time spent for a course per week is 5 hours. Construct a 96% confidence interval for the mean time spent studying for a course.
(4.12,5.88)
(4.18,5.82)
(4.02,5.98)
(3.97,6.03)
None of the other 4 answers
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