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It is estimated that 17.4% of all U.S. households own a Roth IRA. The American Association of University Professors believes this figure is higher among its members and commissions a study. If 150 out of a sample of 750 AAUP members own Roth IRAs, is this sufficient evidence to support the claim of the AAUP?
The short article "Developing Science-Based Food and Nutrition Information" (Journal of the American Dietetic Association
Write a program which simulates both cases for a run of 1000 trials, prints out the proportion of successes for each run, and repeats this process ten times.
(a) What are the possible values of X? (b) For each possible value of X, determine its probability. (c) Present the distribution law (the probability mass function) of the random variable X as a table. (d) Depict the probability mass function of X as..
What height is at the 35th percentile? Include an appropriately labeled sketch of the Normal curve to support your answer.
The total cholesterol levels of a sample of men aged? 35-44 are normally distributed with a mean of 219 milligrams per deciliter and a standard deviation
Suppose that each of two statisticians A and B independently takes a random sample of 20 observations from a normal distribution for which the mean
If it takes 4 hours to cover x miles and 5 hours to cover y miles, what is the average speed?
the brightness of a television picture tube can be evaluated by measuring the amount of current required to achieve a
Determine whether the LZR Racer significantly improves swimmers' times at the 5% significance level. Assume that the time difference is normally distributed. Comment on whether the data appear to support FINA's decision.
nobel prize winners. the national science foundation collects data on nobel prize laureates in the field of science
An internet company has redesigned its website to improve the online experience of its customers. To test whether the new design has improved its customers' experience it has asked people to comment on whether they prefer the new format or not.
Calculate Cohen's d measure effect size for both tests (σ = 20 and σ = 10). Explain how sample size affect outcome of hypothesis test. How does sample size affect measures of effect size?
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