b Calculate the Test statistic Round your answer to 3 decima

(b) Calculate the Test statistic. (Round your answer to 3 decimal places.) Test statistic [The following information applies to the questions displayed below.] A digital camcorder repair service has set a goal not to exceed an average of 5 working days from the time the unit is brought in to the time repairs are completed. A random sample of 12 repair records showed the following repair times (in days): 9, 9, 5, 6, 5, 7, 6, 3, 7, 9, 8, 4.

Solution

sample size= n=12

sample mean=6.5

sample standard deviaton = s= 2.0226

So the test statistic is

t=(xbar-mu)/(s/vn)

=(6.5-5)/(2.0226/sqrt(12))

=2.569