Environmental Health luch discussion has taken place concerning possible health hazards from exposure to anesthetic gases. In one study conducted in 1972, 531 nurse anesthetists were surveyed by mail questionnaires and telephone interviews to etermine the incidence rate of cancer. Of this group, 7 women reported having a new malignancy other than skin cancer during 1971. USE SALT (a) What is the best estimate of the 1971 incidence rate from these data? (Round your answer to four decimal places.) (b) Provide a 95% CI for the true incidence rate. (Enter your answer using interval notation. Round your numerical values to four decimal places.) comparison was made between the above report and the 1969 cancer-Incidence rates from the Connecticut tumor registry, where the expected incidence rate, based on the age distribution of the nurses in the above study, was etermined to be 402.8 per 100,000 person-years. (c) Comment on the comparison between the observed incidence rate and the Connecticut tumor registry data. (Round your answer to four decimal places.)

In the US, 43.9% of all people have type O blood, 40.6% have type A blood, 10.8% have type B blood and 4.7% have type AB blood. A researcher wants to see if the distribution of blood type is different for millionaires. The table below shows the results of a random sample of 3488 millionaires. What can be concluded at the a = 0.05 significance level? a. Complete the table by filling in the expected frequencies. Round to the nearest whole number: Frequencies of Blood Type Outcome Frequency Expected Frequency 1521 A 1427 В 376 АВ 164

. Do patients with gastrointestinal issues experience more psychological distress than the general population?   The DASS-21 questionnaire is a validated measure of depression, anxiety, and stress. For the general population, the mean for anxiety is µ = 4.2. Anxiety levels are calculated based on self-reported answers to questions on a scale from 0 through 42, with lower scores indicating lower anxiety.   Participants with gastrointestinal issues (specifically inflammatory bowel disease, IBD) completed the DASS-21. Use the data presented below to determine whether having gastrointestinal issues like IBD significantly increases risk for anxiety. Test whether or not the performance of this sample is significantly higher than the normal population using the proper t-test.  Here are the data:   Anxiety scores: 12, 15, 10, 8, 10, 5, 10, 13, 4, 6   ANALYSES AND UNGRADED OPTIONAL GUIDING QUESTIONS: 1a. Identify the Indep.Variable:__                  Dep.Variable:__ Is it the Hypothesis…

A researcher wants to find the effect of a special diet on systolic blood pressure. A sample of 7 adults was selected to start them on this diet for 3 months. Based on this information, can it be stated that systolic blood pressure changes with the special diet? The test statistic that will determine whether systolic blood pressure changes with the special diet is...... A. 1.23 B. 0.48 C. 18.1 D. 21.08 E. 4.08