A company is developing a new

A company is developing a new high performance wax for crosscountry ski racing. In order to justify the price marketing​ wants,the wax needs to be very fast.​Specifically, the mean time tofinish their standard test course should be less than 55 secondsfor a former Olympic champion. To test​ it, the champion will skithe course 8 times. The​ champion’s times​ (selected at​ random)are 51.4, 63.3​, 51.2, 54.3​,49.4,49.4,50.8,and 40.3 seconds tocomplete the test course. Should they market the​ wax? Assume theassumptions and conditions for appropriate hypothesis testing aremet for the sample. Use 0.05 as the​ P-value cutoff level.Calculate the t statistic-round to three decimal places The P valueis-round to three decimal places?


Here we have given that,


X: Champions time

n=number of champions =8

= sample mean==51.26

s=sample standard deviation= 6.34

Claim: To check whether the mean time to finishtheir standard test course should be less than 55 seconds for aformer Olympic champion

The Hypothesis is as follows


Now, we can find the test statistic



= -1.667

we get,

the Test statistic is -1.667

Now we find the P-value

= level ofsignificance=0.05

degrees of freedom = n-1= 8-1=7

This is one left tailed test

Now, we can find the P-value

P-value =0.070 using excel = TDIST( | t-stat | = 1.667,d.f = 7, tail=1)

we get the P-value is 0.070


P-value > 0.05 ()

That is we fail to reject reject Ho (Null Hypothesis)


There is the not sufficient evidence thatthe mean time to finish their standard test course shouldbe less than 55 seconds for a former Olympic champion

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