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?
Answer:
Here we have given that,
| X |
| 51.4 |
| 63.3 |
| 51.2 |
| 54.3 |
| 49.4 |
| 49.4 |
| 50.8 |
| 40.3 |
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
v/s
Now, we can find the test statistic
t-statistics= 
=
= -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
Decision:
P-value > 0.05 (
)
That is we fail to reject reject Ho (Null Hypothesis)
Conclusion
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
"Our Prices Start at $11.99. As Our First Client, Use Coupon Code GET15 to claim 15% Discount This Month!!"
