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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.
If a horse is chosen at random, what is the probability the horse exhibited head movements to Mozart or to heavy metal or to both?
The data was used to make inferences regarding the other students taking the course. Construct a 95% confidence interval estimate. Explain your findings so that your non-quantitative partner will understand them. Their data is below:
Assuming boy and girl children are equally likely and births are independent, if parents have two children, what is the probability that at least one is a boy? On the condition that at least one is a boy, what is the probability that one of the..
Why did greeks astronomers conclude that the heaven were made up of perfect crystalline spheres moving at constant speeds?
A standard deviation of 1.9 pounds. What is the 95 percent confidence interval for the true mean weight, u, of all packages received by the parcel service?
use the normal approximation to binomial to find the probability for n 48 p 0.9 and x lt
What is the probability that the sample proportion p of an SRS of size n = 1000 Who say their health is excellent lies between 26% and 32%?
Interpret the interaction graph in terms of what it shows about the three effects tested.
A personnel manager is concerned about absenteeism. She decides to sample the records to determine if absenteeism is distributed evenly throughout the six-day workweek.
For example, why do you think women's heights are distributed in this way rather than, for instance, being equally spread out from about 5 feet tall to 6 feet tall?
A number of minor automobile accidents occur at various high-risk intersections in Teton County despite traffic lights. The Traffic Department claims that a modification in the type of light will reduce these accidents.
The following data show the cost of electricity during August 2010 for a random sample of 50 one-bedroom apartments in a large city:
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