# What is the appropriate test procedure

8.14 Test for a significant difference in the variances of the initial white blood cell count between patients who did and patients who did not receive a bacterial culture.

8.15 What is the appropriate test procedure to test for significant differences in mean white blood cell count between people who do and people who do not receive a bacterial culture?

8.18 Compute a 95% CI for the true difference in mean white blood cell count between the two groups.

A 1980 study was conducted whose purpose was to compare the indoor air quality in offices where smoking was permitted with that in offices where smoking was not permitted [7]. Measurements were made of carbon monoxide (CO) at 1:20 p.m. in 40 work areas where smoking was permitted and in 40 work areas where smoking was not permitted. Where smoking was permitted, the mean CO level was 11.6 parts per million (ppm) and the standard deviation CO was 7.3 ppm. Where smoking was not permitted, the mean CO was 6.9 ppm and the standard deviation CO was 2.7 ppm.

8.25 Test for whether the standard deviation of CO is significantly different in the two types of working environments.

State the null hypothesis

State the alternative hypotheses

show the test statistics.

8.28 What statistical procedure can be used to test whether there is a significant difference in the median gray levels between cataractous and normal eyes?

8.29 Carry out the test procedure mentioned in Problem 8.28, and report a p-value.

8.30 Provide a 99% CI for the mean difference in median gray levels between cataractous and normal eyes.

8.39 What is the appropriate test procedure to determine whether there is a systematic difference between the assessments of Doctor A vs. Doctor B?

Is there any more information that goes with this question? In particular, what is being measured?

8.56 What test can be performed to compare the variances of the two genotype groups?

8.92 What test can be used to compare the mean ln (ERG amplitude) between patients with dominant vs. recessive RP?

8.15 What is the appropriate test procedure to test for significant differences in mean white blood cell count between people who do and people who do not receive a bacterial culture?

8.18 Compute a 95% CI for the true difference in mean white blood cell count between the two groups.

A 1980 study was conducted whose purpose was to compare the indoor air quality in offices where smoking was permitted with that in offices where smoking was not permitted [7]. Measurements were made of carbon monoxide (CO) at 1:20 p.m. in 40 work areas where smoking was permitted and in 40 work areas where smoking was not permitted. Where smoking was permitted, the mean CO level was 11.6 parts per million (ppm) and the standard deviation CO was 7.3 ppm. Where smoking was not permitted, the mean CO was 6.9 ppm and the standard deviation CO was 2.7 ppm.

8.25 Test for whether the standard deviation of CO is significantly different in the two types of working environments.

State the null hypothesis

State the alternative hypotheses

show the test statistics.

8.28 What statistical procedure can be used to test whether there is a significant difference in the median gray levels between cataractous and normal eyes?

8.29 Carry out the test procedure mentioned in Problem 8.28, and report a p-value.

8.30 Provide a 99% CI for the mean difference in median gray levels between cataractous and normal eyes.

8.39 What is the appropriate test procedure to determine whether there is a systematic difference between the assessments of Doctor A vs. Doctor B?

Is there any more information that goes with this question? In particular, what is being measured?

8.56 What test can be performed to compare the variances of the two genotype groups?

8.92 What test can be used to compare the mean ln (ERG amplitude) between patients with dominant vs. recessive RP?

You'll get a 250.9KB .DOCX file.