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Youthful appearance. Readers Digest reported results of several surveys that asked graduate students to examine photographs of men and women and try to guess their ages. Researchers compared these guesses with the number of times the people in the pictures reported having sexual intercourse. It turned out that those who had been more sexually active were judged as looking younger, and that the difference was described as statistically significant. Psychologist David Weeks, who compiled the research, speculated that lovemaking boosts hormones that reduce fatty tissue and increase lean muscle, giving a more youthful appearance.
a) What does statistically significant mean in this context?
b) Explain in statistical terms why you might be skeptical about Dr. Weeks conclusion. Propose an alternative explanation for these results.
Can you explain to me how the null and alternative hypothesis for one-sample testing differs from two-sample testing; and explain how these two hypothesis' are the same. Please provide a numerical example:
the hights of male adults are normally distributedwith mean 1.7m and standard deviation 0.2m. in a population of 400
a sample of 27 blue jellybeans with a mean weight of 0.8580 g was taken. assume that the standard deviation is known to
$600 (1 chance in 4800); $200 (1 chance in 2500). Find the expected value of the amount won for one entry if the cost of entering is 52 cents.
Find the test statistic that would be used for a test of H0: p = 0.3 versus Ha: p ≠ 0.3, given a sample proportion of 0.35 from a sample size of 200.
A sample of the length of time it took 42 persons to assemble the unit was organized into the following frequency distribution. What is the standard deviation (in minutes)?
The firm's EBIT is expected to remain constant at $2,600,000 per year in the future. All net income is paid out as dividends and the firm can borrow at a constant 9% (regardless of the level of debt). If the firm sells debt, it uses its proceeds t..
Find the combination of Model Alpha and Model Beta that maximizes the firm profit. What is firm's profit at this profit mix and shows the combinations of Model Alpha
For each of the given situations reported in the news, specify what variable(s) were measured on each individual and whether they are best described as categorical, ordinal, or quantitative.
a statistics practitioner would like to estimate a population mean to within 40 units with 99 confidence given that the
At the first tri-city meeting, there were 8 people from town A, 7 people from town B, and 5 people from town C. If the council consists of 5 people,
1.as part of a promotion for a new type of cracker free trial samples are offered to shoppers in a local supermarket.
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