Question 13 0.00000 out of 4.00000 points A new light bulb is being considered for use in an oice with computers. It is decided that the new bulb will only be used if it has a mean lifetime of more than 500 hours. A random sample of 40 bulbs is selected and placed on life test. The mean and standard deviation are found to be 505 hours and 18 hours, respectively. Use a 0.01 level of signicance. The hypothesis to be tested is: H0: mu=500 vs. Ha: mu>500 The test statistic is: z=l .76 Please state the correct conclusion. Answers: A. Reject the null hypothESiS- B. Accept the null hypothesis. C. Not enough information is given. D. Fail to reject the null hypothesis