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14.    R & R Electronics manufactures laser printers. The following is the distribution on the repair history...

14.    R & R Electronics manufactures laser printers. The following is the distribution on the repair history of printers repaired under the first six months of the warranty. Assume the population mean is 3.4 months and standard deviation is 1.5 months. Is it reasonable to assume that the population of the number of months are normally distributed? Use the 0.05 significance level.

Number                                 Number   

of Months                             Repaired

under one month                       15

l  to 2                                        18

2 to 3                                         42

3 to 4                                        36

4 to 5                                        21

5 to 6                                        13

over 6                                        _5_  

                                      150

a.    State the null and alternate hypotheses.

              H0.                                                                            H1.

b.   State the decision rule.

          

c.    Compute the value of the test statistic.

b.     What is your decision regarding the null hypothesis? Interpret the result.

Math   Statistics-And-Probability   
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