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1. According to a Yankelovich poll, women spend an average of 19.1 hours shopping during the month of December, compared to 12.7 hours for men. Assuming that file XR11027 contains the survey data underlying these results, use the 0.01 level in examining whether the sample mean for women is significantly higher than that for men. Identify and interpret the p-value for the test.
Source: Anne R. Carey and Gary Visgaitis, "‘Tis the Season, Health," USA Today 1999 Snapshot Calendar, December 8.
2. When companies are designing a new product, one of the steps typically taken is to see how potential buyers react to a picture or prototype of the proposed product. The product-development team for a notebook computer com- pany has shown picture A to a large sample of potential buyers and picture B to another, asking each person to indi- cate what they "would expect to pay" for such a product. The data resulting from the two pictures are provided in file XR11028. Using the 0.05 level of significance, determine whether the prototypes might not really differ in terms of the price that potential buyers would expect to pay. Identify and interpret the p-value for the test. Construct and inter- pret the 95% confidence interval for the difference between the population means. Is the hypothesized difference (0.00) within the interval? Given the presence or absence of the 0.00 value within the interval, is this consistent with the findings of the hypothesis test?
If they stop 40 cars during the first hour, what is the mean of the number of drivers expected to be wearing their seat belts?
suppose we are testing the null hypothesis ho20 and the alternative ha does not 20 for a normal population with a
If an auction house is selling products to risk neutral buyers, which of the types of auction would you recommend? If you are a potential buyer, what might your strategy be? Support your answers using economic analysis learned in this course.
use normal approximation to estimate the probability of getting exactly 48 girls in 100 births. assume that boys and
1. Describe 5 data collection techniques in your own words.
Write a short report that includes an introduction, a conclusion paragraph and a body which answers fully the two questions posed in the problem - Comparing the preceding probabilities, which areas seem strongest and weakest in terms of the amount..
the probability that an american ceo can transact business in a foreign language is 20. ten american ceo s are chosen
Assuming that both turnover and costs have normal distributions, each with a standard deviation of $250000, what is the probability that the company makes a profit?
a horizontal cylinder is heated electrically. the cylinder is supplied with a current at a dc voltage. using the data
Testing for Population mean - determine if there has been a significant change in the population mean.
Chemical Financial Corporation signs an agreement on January 1, 2014, to lease equipment to Chells, Inc. The following information relates to this agreement.
the distribution of actual weights of 8-oz chocolate bars produced by a certain machine is normal with mean 8.1 ounces
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