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On a certain examination the average score is 53 and the standard deviation is 6. Find a range of values within which at least 75% of the scores will fall.
Assuming that a hypothesis test of the claim has been conducted and that the conclusion is to reject the null hypothesis, state the conclusion in nontechnical terms.
What is the probability that the first order will come on the fourth sales call of the day? Please show work and round to 4 decimal places.
A total of 150 households were asked if they had Internet access, of which 57 responded "Yes". Which of the following would represent a 98% confidence interval around this sample proportion?
A random sample of 50 men, 40% said they preferred walking up stairs than taking the elevator. In a random sample of 40 women
Assume that the data are normally distributed in the population. Now go back and examine the $1,250 figure published by Runzheimer International. Does it fall into the confidence interval computed from the sample data? What does it tell you?
Two models of a product - Regular (X) and Deluxe (Y) - are produced by a company. A linear programming model is used to determine the production schedule.
About 72% of dog owners buy holiday presents for their dogs. Suppose n = 4 dog owners are randomly selected. Find the expected number of persons, in the sample, who buy their dog holiday presents.
Sixty-four students in an introductory college economics class were asked how many credits they had earned in college, and how certain they were about their choice of major.
Let the null hypothesis be the landlord association claim and the alternative hypothesis be the housing authority claim. Doe the data support the landlord's association claim? What would you report to the housing authority?
If all samples of size 64 are drawn, mean of sample according to Central Limit Theorem is 100.
Construct a 95% confidence interval estimate for the average waiting time of all the patients who visit this doctor. Assume the population of waiting times is normally distributed.
Chrysler Corporation agrees to allow you to randomly select 40 of its new Dodge Caravans to test the highway mileage. Chrysler claims that the caravans get 28mpg on the highway.
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