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Question: Refer to a study published in the Journal of the American Medical Association and reported in the Sacramento Bee on January 26, 2000 ("Study Ties Hormone Replacement, Cancer" by Shari Roan, p. A1). A sample of 46,355 postmenopausal women were studied for 15 years and asked about their use of hormone therapy and whether or not they had breast cancer; 2082 developed the disease. The article reported that "for each year of combined [estrogen and progestin] therapy, a woman's risk of breast cancer was found to increase by 8 percent compared to a 1 percent increase in women taking estrogen alone."
Assuming that the women and their physicians made the decision about which treatment to pursue (combined hormones, estrogen alone, or no hormones), discuss the possibility of confounding variables in this study.
a pearson correletion of r 0.45 for a sample of n 18 individuals is large enough to conclude that there is a
Construct cumulative risk profiles for the three alternatives, assuming Apricot has a 25% chance of winning the lawsuit. Can you draw any conclusions?
Use the t statistic of Theorem 8 to construct a (1 - α)100% confidence interval formula for βi for i = 0, 1, ... , k.
Let N(t) be the number of telephone calls to an emergency number in the interval [0,t]. We suppose that {N(t),t ≥ 0} is a Poisson process with rate λ = 50 per hour
Over the last 3 years, Art's Supermarket has observed the following distribution of modes of payment in the express lines: cash (C) 41%, check (CK) 24%.
how many different seven-digit phone numbers can be generated provided that the first digit cannot be zero? explain
the following games are played with 8 cards the four kings and the four aces. the dealer fans the cards with their back
Due to all the unceratinties in government health care legislation, shouldice would like to justify any expansion within a five-year time period. How would I set this problem up?
a.) What percentage of customers will receive a free oil change coupon?
Using schools as blocks, describe a randomized block design to compare three teaching methods.- Explain why schools should be used as blocks.
Assume that a study of 300 randomly selected school bus routes showed that 279 arrived on time. Is it unusual for a school bus to arrive late?
for a continuous random variable x p27 ? x ? 74 0.35 and px gt 74 0.1. calculate the following probabilities. how
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