Pulmonary Disease Suppose 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 11.8 parts per million (ppm) and the standard deviation CO was 7.4 ppm. Where smoking was not permitted, the mean CO was 6.7 ppm and the standard deviation CO w 2.8 ppm. (Let population 1 be smoking was permitted and population 2 be smoking was not permitted. Use smoking-nonsmoking.) You can use the Inferential Statistics page and the Distribution Calculators page in SALT to answer parts of this question. (a) Test for whether the standard deviation of CO is significantly different in the two types of working environments. (Use = 0.05.) State the null and alternative hypotheses (in ppm). (Enter - for as needed.) Ho H₂: Find the test statistic. (Round your answer to two decimal places.) Use technology to find the p-value. (Round your answer to four decimal places.) p-value= State your conclusion. Reject Ho. There is sufficient evidence to conclude that the standard deviation of CO is significantly different in the two types of working environments. Reject Ho. There is insufficient evidence to conclude that the standard deviation of CO is significantly different in the two types of working environments. Fail to reject Ho. There is insufficient evidence to conclude that the standard deviation of CO is significantly different in the two types of working environments. Fail to reject Ho. There is sufficient evidence to conclude that the standard deviation of CO is significantly different in the two types of working environments. (b) Test for whether or not the mean CO is significantly different in the two types of working environments. (Use -0.05.) State the null and alternative hypotheses (in ppm). (Enter - for as needed.) Ho: H₂: Find the test statistic. (Round your answer to two decimal places.) Use technology to find the p-value. (Round your answer to four decimal places.) p-value= State your conclusion. Reject Ho. There is insufficient evidence to conclude that the mean CO is significantly different in the two types of working environments. Fail to reject Ho. There is insufficient evidence to conclude that the mean CO is significantly different in the two types of working environments. Reject Ho. There is sufficient evidence to conclude that the mean CO is significantly different in the two types of working environments. Fail to reject Ho. There is sufficient evidence to conclude that the mean CO is significantly different in the two types of working environments. (c) Provide a 95% CI (in ppm) for the difference in mean CO between the smoking and nonsmoking working environments. (Enter your answer using interval notation. Round your numerical values to two decimal places.) ppm