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To test whether the population mean is less than a specified value

The management of White Industries is considering a new method of assembling its golf cart. The present method requires 42.30 minutes, on the average, to assemble a cart. The mean assembly time for a random sample of 24 carts, using the new method, was 40.6 minutes, and the standard deviation of the sample was 2.7 minutes. Using the 0.10 level of significance, can we bring to a close that the assembly time using the new method is faster?

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