For each of the following questions, please identify the appropriate statistical

Question

For each of the following questions, please identify the appropriate statistical technique to use to answer the sclentific question posed. Use the same set of answers for every question. a) 1-sample z test for proportions b) 1-sample t test h) linear regression collects heart attack rates (# per thousand individuals) by making inquiries to hospitals in the same 43 2. The same medical researcher learns from the Center for Disease Control that the U.S. heart attack c) 1-variable chi-square test d) 2-sample z test for proportionse) 2-sample t test f 2-variable chi-square test g) correlation analysis 1. A medical researcher has access to the average HDL cholesterol readings from people in 43 cities, and cities. She is interested in determining if cholesterol readings can predict the risk of heart attacks. i) analysis of variance rate is 0.23% per individual per year. She now wants to know if the sample from her city is significantly different from the national figure. 3. Dragonflies were observed in a wetland preserve to investigate possible effects of body size on male dragonfly territorial ability. Eleven male dragonflies with territories were captured with nets and wing length measured, and a quantitative index of territory quality was evaluated for each insect on a scale from 10 (high quality) to 1 (low). 4. The dragonfly researchers wanted to test the same scientific question, but in a slightly different way They compared wing lengths of the 11 dragonflies from the previous question to 11 male dragonflies which were observed not to have territories. 5. In a study of HIV infection among women entering the New York State prison system, new 475 inmates were cross-classified with respect to HIV infection status and whether they have a history of intravenous drug use. The researchers want to make several conclusions from this study, but the first thing they want to know is whether the HIV infection rate of the new inmates (all of whom previously lived in the same county with the prison) is significantly different from that of the county containing the prison. 6. Next, the prison officials want to analyze risk factors for HIV infections. They use the data collected on the new inmates to determine if HIV-infected inmates were more likely to also be intravenous drug users than non-infected inmates. 7. A commercial seed manufacturer is concerned about weed seeds accidentally mixed in with grass seeds for sale. In a greenhouse, eight samples are planted, each in a large pot. After the plants start to grow, the number of weed plants germinating in each pot is recorded, mixed in with the grass plants

Explanation / Answer

Q 1) Answer: 1- sample t test

Q 2) Answer: 1- sample z test for porportion

Q 3) Answer: Linear regression

Q 4) Answer: : 2 SAmple t test

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