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Gender and commercial preference. 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 54 out of 115 women and 83 out of 145 men. Give an estimate of the difference in gender proportions that favored Commercial A. Also construct a large-sample 95% confidence interval for this difference.
Determine the test statistic. At 95% confidence, test to determine if more than 21% of the population will like the new soft drink.
at one time the cholesterol levels for women aged 20 to 34 follow an approximately normal distribution mean 185
Conduct a two-sided hypothesis test to determine whether there is any evidence the mean monthly water usage is different from 714 cubic feet. Use a = 0.05.
Comment briefly on the difference in answers between part d and part e. What important assumption regarding independence makes these answers different? Which assumption do you think is more realistic? Why?
Would the conclusion remain the same if the two confidence intervals had instead been calculated at 90% confidence? Explain.
What percent of horse pregnancies are longer than 339 days?
What kind of design did the researchers use?- Write appropriate hypotheses.- Are the assumptions and conditions necessary for inference satisfied?
If a household is selected at random, find the probability that it generates more than 27 pounds per month of newspaper for garbage or recycling.
A professor want to know how students feel about gun control, so he surveys his students asking %60Are you in favor or opposed to gun control.%60 All of his students respond. What is the major source of possible bias in this study?
Bell-shaped with a mean of $45, 000 and a standard deviation of $3, 500. What percentage of teachers earn anywhere from $38, 000 to $48, 500?
The Sony corporation produces a Walkman that requires two AA Batteries. The mean life of these batteries in this product is 35.0 hours. The distribution of the battery lives closely follows the normal probability distribtion with a standard deviat..
Calculate the mean and the standard deviation of the stock prices.- Get the corresponding data for Kmart and calculate the mean and the standard deviation.
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