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Charles entered a contest with 29 of his classmates (30 in all). A random draw will determine his prize. How many ways can this happen if one person will win a new pencil, another will win a trip to McDonalds, another will win a weekend in Chicago, and the final prize is an automatic 4.0 in Math class.
A developmental psychologist is studying memory development in children. He is interested in determining the exact age at which children began to recall long-term episodic memories.
There a flu epidemic that is spreading across SF County. You are a principle and are in charge of 32 teachers. You want to plan ahead and be able to estimate how many substitute teachers the school may need during this epidemic.
What percent of healthy young adults has osteoporosis by the WHO criterion? Suppose that the standard deviation is the same as for young adults. What percent of this older population has osteoporosis?
Calculate the limits within which the weight of the packets should lie assuming that the machine is not been classified as faulty.
Drawing on one of your interests in the study of criminal justice, develop three hypotheses that can be tested using t-tests. Why do you think it would be interesting or important to test these hypotheses?
A college believes that 28% of applicants to that school have parents who have remarried. How large a sample is needed to estimate the true proportion of students who have parents who have remarried to within 5 percentage points with 95% confidenc..
The probability of an randomly selected person quits a team is 0.125. Assume the team has n members. Determine the smallest n that the team needs to have if the probability of the team has at least 20 members left is 0.9.
Test at the .05 significance level the null hypothesis that the population proportions are equal against the two-tailed alternative.
The t-statistics that was obtained in the study of 400 subjects was t=20, rejecting the null hypothesis and showing that the drug has a beneficial effect. Why was management upset?
Compute b1, slope of an OLS regression line using dollars spent as dependent variable (Y) and age as independent variable (X).
A random sample of 56 fluorescent light bubs has a mean life of 645 hours with a standard deviation of 31 hours.
The U.S. Fish and Wildlife Service's report on the bass population in the North American lakes indicated average weight of the fish to be 3.0 lb.
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