A 1980 study was conducted whose purpose was to compare the indoor
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A 1980 study was conducted whose purpose was to compare the indoor

Pulmonary Disease

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. 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.

Q1. Test for whether the standard deviation of CO is significantly different in the two types of working environments.

Q2. Test for whether or not the mean co is significantly different in the two types of working environments.

Q3. Provide a 95% CI for the difference in mean Co between the smoking and nonsmoking working environments.

Hint
Statistics"1. The null hypothesis is not rejected. As, there is no enough evidence to support the claim that the CO level is lower  in non-smoking working areas in comparison to smoking work areas.i.e. P-value = 0.07.And, hereWe have to perform the test on the difference of means.In this the claim that we want to test is that CO is less present in no-smoking work areas.Then, the null and alte...

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