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In 1984 the country of Morocco in an attempt to determine the average amount of time that tourists spend in that country on a visit tried two different sampling procedures. In one, they questioned randomly chosen tourists as they were leaving the country; in the other, they questioned randomly chosen guests at hotels. (Each tourist stayed at a hotel.) The average visiting time of the 3000 tourists chosen from hotels was 17.8, whereas the average visiting time of the 12,321 tourists questioned at departure was 9.0. Can you explain this discrepancy? Does it necessarily imply a mistake?
Complete the table and answer the following questions. Use the .05 significance level. How many treatments are there? What is the total sample size?
question thompson photo works purchased several new highly sophisticated machines. the production department needed
Committee were chosen from among the workers without regard to gender: Does this represent a binomial random distribution? Why?
The gross weekly sales at a certain used-car lot are normal with mean $18,800 and standard deviation $9000. (a) What is the probability that next week's sales exceed $20,000?
Assume you have the following data: H1: µ ? 200, S =30, n = 64, and X =218. Conduct a two tailed hypothesis test at the 0.05 significance level.
Compute the test statistic. At 95% confidence using the p-value approach, test to see if taking the course actually increased scores on the driving exam.
For a random sample of 200 undergraduates he finds that 70 have some kind of allergy. What is the standard error of the sample proportions?
1.researchers are studying the absorption of two drugs into the bloodstream. each drug is to be injected at three
Use the auxiliary variable approach to model this problem and write a short memo to the marketing manager explaining the solution and sensitivity information.
The president of an agency specializing in public opinion surveys claims that approximately 70% of all people to whom the agency sends questionnaires responds by filling out an returning the questionnaire.
a car agency sells 50 of its inventory of a certain foreign car equipped with side airbags. let x be the number of cars
A certain medication is known to increase the pulse rate of its users. The standard deviation of the pulse rate is know to be 4 beats per minute. A sample of 40 users had an average pulse rate of 98 beats per minute. Find the 95% confidence interv..
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