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A 20-minute consumer survey mailed to 500 adults aged 25–34 included a $5 Starbucks gift certificate.
The same survey was mailed to 500 adults aged 25–34 without the gift certificate. There were 65 responses from the first group and 45 from the second group. (a) Perform a two-tailed test comparing the response rates (proportions) at α = .05. (b) Form a confidence interval for the difference of proportions, without pooling the samples. Does it include zero?
Please provide how you figured out the results.
It seems that simulation could handle any situation or study. But is that always true? Discuss instances in which a simulation would be important and useful, and then a situation in which a simulation would not be appropriate.
In a large department store a customer complaints office handles an average of six complaints per hour about the quality of service.
Find a 99% confidence interval for the difference in the mean number of calls between night and day.
Suppose that the mortgage payments of all homeowners have a normal distribution. What is the mean monthly mortgage paid by all homeowner?
Use differential calculus to find both sales volume at which revenue is maximised and the maximum revenue available from sales of product X.
A standard deviation of 20. If the seller wishes to have adequate stock 95% of the time, how many of the games must she keep on hand.
The experimental medication of the placebo. Generate a 95% confidence interval for the difference in proportions of patients with hypertension between groups.
Before the rush began for Christmas shopping, a department store had noted that the percentage of its customers who use the store's credit card, the percentage of those who use a major credit card, and the percentage of those who pay cash are the ..
A description of a Pew Research Center poll referred to "the random generation of the last two digits of telephone numbers." Each digits has the same chance of being randomly generated. Construct a table representing the probability distribution f..
Two quadratic equations that are multiples of each other are actually the same equation, and that they don't count as being "more than one QE that have the same solution set".
Visits to Web sites. What kinds of Web sites do males aged 18 to 34 visit most often? Pornographic sites take first place, but about 50 percent of male Internet users in this age group visit an auction site such as eBay at least once a month. Inte..
A questionnaire will be published and the first 1000 completed questionnaires will be analyzed. Which of the following errors will be associated with the sample? Sampling errors only.
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