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

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.4: Distributions Of Data
Problem 19PFA
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  1. 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

    1. 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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