a recent case control study on hypertension and the use of Oral Contraceptives (OC) in Queens, NY, a total of 2,700 women were diagnosed with hypertension and 1,200 did not have a history of OC. Of the 700 women without hypertension, 300 did not have a history of OC. What is the odds ratio for the association between OC use and hypertension

Whirling disease is a deadly disease that affects trout in Montana riversIn a follow-up to a 2006 study conducted by the Montana Department of FishWildlife and Parks (FWP)researchers sought to determine if the proportion of trout afflicted by whirling disease in the Gallatin river differs between rainbow trout and brown trout. To test this theory, researchers collected a representative sample of 527 rainbow trout and 459 brown trout. Of the 527 rainbow trout collected, 120 had developed whirling disease; of the 459 brown trout collected, 74 had developed whirling disease Calculate the relative risk of whirling disease for rainbow trout compared to brown trout in this sample.

There are several possible explanations for the existence of a statistical relationship between two variables. Which is not a common explanation? A. Common Cause B. Confounding factor C. Coincidence D. None of the above

An issue of Time Style and Design reported on a poll conducted on the shopping habits of wealthy Americans. A total of 603 interviews were conducted among a national sample of adults with household incomes of at least $150,000. Of the adults interviewed, 410 said they had purchased clothing, accessories or books online in the past year. We want to understand the percentage of wealthy Americans who shop online. Do the data provide sufficient evidence to say that the majority (more than 50%) of wealthy Americans shop online at the 5% significance level? a. What are n, x, n-x and ??̂? b. State the null and alternative hypotheses. c. What is the value for the test statistic z0? d. Find the p-value. e. Do the data support that (more than 50%) of wealthy Americans shop online?

If medication A is 38% effective, what are the odds of medication A being effective? What are the odds of it not being effective?

A scientist is studying the effect of a new type of exercise program on cardiovascular health. The scientist randomly assigns individuals to either the exercise program or a control group. The scientist wants to determine if the exercise program has a statistically significant effect on cardiovascular health. The scientist monitors cardiovascular health by measuring the blood pressure of each individual.

You may need to use the appropriate appendix table or technology to answer this question. Fewer young people are driving. In year A, 62.9% of people under 20 years old who were eligible had a driver's license. Twenty years later in year B that percentage had dropped to 48.7%. Suppose these results are based on a random sample of 1,500 people under 20 years old who were eligible to have a driver's license in year A and again in year B.   (a) At 95% confidence, what is the margin of error of the number of eligible people under 20 years old who had a driver's license in year A? (Round your answer to four decimal places.)   At 95% confidence, what is the interval estimate of the number of eligible people under 20 years old who had a driver's license in year A? (Round your answers to four decimal places.) _________ to ______________   (b) At 95% confidence, what is the margin of error of the number of eligible people under 20 years old who had a driver's license in year B? (Round your…

The expected relative frequency of a particular outcome is?

2) A researcher suspects that there is a relationship between substance use and sexual activity among single college students.  What statistical analysis tests would you use for this?

1) In a study of the association between exposure to asbestos and risk of mesothelioma, 200 cases were identified, along with 200 population-based controls. In reality, the proportion of cases exposed to asbestos is 10%, and the proportion of controls exposed to asbestos is 1%. However, due to systematic errors in sampling, the proportion exposed to asbestos in the study population was 15% among cases and 5% among controls, such that the odds ratio calculated was 3.35. Of the following terms, which best describes this odds ratio: a) Precise b) Not valid c) Reliable d) Not reliable e) Not precise f) Valid