# Question 12 4 4 points two different analytical tests

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Week 7 Test 2 Complete.docx

Question 11   4 / 4 points Cycling performance before and after an eight week leg - strength training was studied . Seven males performed leg - strength training three days per week for eight weeks . Peak power during incremental cycling increased to a mean of 315 watts with a standard deviation of 16 watts . Is there evidence that leg strength exceeds 300 watts at significance level 0.05 ? Find the P-value .
A ) Reject the null , p- value between .01 and .025
B ) Reject the null , p- value equals .05
C ) Fail to reject the null , p- value between .025 and .05
D ) Fail to reject the null , p- value equals . 025
Question 12   4 / 4 points Two different analytical tests can be used to determine the impurity level in steel alloys . Eight specimens are tested using both procedures , and the results are shown in the following tabulation . Use alpha=0.01 . Determine the test statistic . ( see image )
Question 13   4 / 4 points Two different analytical tests can be used to determine the impurity level in steel alloys . Eight specimens are tested using both procedures , and the results are shown in the following tabulation . Use alpha=0.01 . Is there sufficient evidence to conclude that tests differ ? ( see image )
Question 14   4 / 4 points Two different analytical tests can be used to determine the impurity level in steel alloys . Eight specimens are tested using both procedures , and the results are shown in the following tabulation . If the mean from Test 1 is 0.1 less than the mean from Test 2 , it is important to detect this with probability at least 0.90 . Was the use of eight alloys an adequate sample size ? If not , how many alloys should have been used ? ( see image )
Question 15   4 / 4 points Consider the following film speed data : n1 = 8 , n 2 = 8 , s 1 = 0.11 , s 2 = 0.09 . Test H0 : variance 1 = variance 2 versus H1 : variance1 ≠ variance 2 using alpha = 0.02 . Determine the test statistic .
A ) 6.99
B ) .93
C ) 1.22
D ) 1.49
Question 16   4 / 4 points Consider the following film speed data : n1 = 8 , n 2 = 8 , s 1 = 0.11 , s 2 = 0.09 . Test H0 : variance 1 = variance 2 versus H1 : variance1 ≠ variance 2 using alpha = 0.02 . Determine the critical value .
Question 17   4 / 4 points The F distribution is used to conduct hypothesis tests and construct confidence intervals about the standard deviation of two independent normal populations .
Question 18   4 / 4 points Data from an experiment considered the variability in repeated measurements of the weight of a sheet of paper . The sample standard deviation from 15 measurements was 0.0083 grams . The 95 % confidence interval is [ .00607 , .013 ] . Does the measurement standard deviation differ from 0.01 grams at alpha = . 05 ?
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