Watch Corporation of Switzerland claims that its watches on average will neither gain nor lose time during a week. A sample of 18 watches provided the following gains (+) or losses () in seconds per week.

0.38 0.20 0.38 0.32 +0.32 0.23 +0.30 +0.25 0.10 0.37 0.61 0.48 0.47 0.64 0.04 0.20 0.68 +0.05

a.State the null hypothesis and the alternate hypothesis.

b.State the decision rule for 0.05 significance level.(Negative amounts should be indicated by a minus sign. Round your answers to 3 decimal places.)

c.Compute the value of the test statistic.(Negative amounts should be indicated by a minus sign. Round your answers to 3 decimal places.)

d.Is it reasonable to conclude that the mean gain or loss in time for the watches is 0? Use the 0.05 significance level.

e.Estimate thep-value.

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