A marketing manager wishes to compare the mean prices charged for two brands of CD players. The manager conducts a random survey of retail outlets and obtains independent random samples of prices with the following results:

Assuming normality and equal variances:
a. Use an appropriate hypothesis test to determine whether the mean prices for the two brands differ. How much evidence is there that the mean prices differ?
b. Use an appropriate 95 percent confidence interval to estimate the difference between the mean prices of the two brands of CD players. Do you think that the difference has practical importance?
c. Use an appropriate hypothesis test to provide evidence supporting the claim that the mean µrice of the Onkyo CD player is more than $30 higher than the mean µrice for the JVC CD player. Set a equal to .05.

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Sample mean, X Sample standard deviation, s Sample size Onkyo $189 S 12 JVC $145 $ 10 12