A manufacturer claims that the mean lifetime, u, of its light bulbs is 45 months. The standard deviation of these lifetimes is 7 months. Thirty-one bulbs are selected at random, and their mean lifetime is found to be 48 months. Assume that the population is normally distributed. Can we conclude, at the 0.05 level of significance, that the mean lifetime of light bulbs made by this manufacturer differs from 45 months? Perform a two-tailed test. Then fill in the table below. Carry your intermediate computations to at least three decimal places, and round your responses as specified in the table. н, :0 The null hypothesis: х н, :0 The alternative hypothesis: D=0 OSO (Choose one) " The type of test statistic: O0 The value of the test statistic: (Round to at least three decimal places.) The p-value: (Round to at least three decimal places.) Can we conclude that the mean lifetime of light bulbs made by this manufacturer differs from 45 O Yes O No months? Ix

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Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.