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A study was designed to compare two energy drink commercials. Each participant was shown the commercials in random order and asked to select the better one. Commercial A was selected by 45 out of 100 women and 80 out of 140 men.
Conduct a test for checking that the proportions of women and men that liked commercial A are the same versus the two-sided alternative at the 5% level.
Given the following revenue and cost function for a business firm, calculate the break-even quantity, total revenue, total cost and total profit at break-even level of production.
Based on this information can we determine the proportion of weeks the family spends less than $200. If so, find this proportion. If not, explain why.
For a t distribution with 16 degrees of freedom, find the area, or probability, in each region.
What is the probability that a randomly selected vehicle's VMD will lie between 60,000 and 100,000 miles since its previous crash?
Evaluate the importance of each of these sums of squares. Give the 99% Scheffe confidence intervals for the linear and quadratic contrasts.
In a sample of 855 bartenders, 48% heard complaints from persons about work. If the margin of error was 4.4%, what was the confidence level that was used?
Researchers routinely choose an alpha level of 0.05 for testing their hypotheses. What are some experiments for which you might want a lower alpha level (e.g., 0.01)? What are some situations in which you might accept a higher level (e.g., 0.1)?
Compare these with the percentages specified by Tchebysheff's Theorem.
At α = .05, is there a difference in variances? Illustrate all steps clearly, including the illustration of the decision rule.
What can you say about the effect of sample size on confidence intervals?
Use a significance level to test the claim that the mean weight loss is greater than 0. Based on these results does the diet appear to be effective. Does the diet appear to have practical significance.
Population and the sample proportion of grandparents as primary caregivers (-hat) is to be calculated. What is the mean of the sampling distribution of -hat?
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