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The time it takes to complete a Sta220 term test is normally distributed with a mean of 100 minutes with standard deviation of 14 minutes. How much time should be allowed if we wish to ensure that at least 9 out of 10 students (on average) can complete it? (round to the nearest minute)
A) 115B) 116C) 117D) 118E) 119
Assume the population standard deviations are not the same. At the .05 significance level, is there a difference in the mean waiting time?
An electronic test equipment manufacturing company markets a certain piece of specialty equipment. The company has several competitors who currently market similar pieces of equipment.
Can we conclude that mean time for game is less than 3.50 hours? Use.05 significance level.
Using one mean t test to determine whether or not to support the claim - hypothesis test that WORKS THE SAME as the z-test
Identify the indicated values or interpret the given display. In a survey of 703 randomly selected workers,
At alpha = 0.05, is there enough evidence to conclude that proportions vary from those in the study?
Caculate the expected value of the profit made by the insurance company. Many call this kind of situation a win win opportunity for the insurance company and the promoter. Do you agree? Explain.
Do you try to pad your insurance claim to cover your deductible? About 40% of all U.S. adults will try to pad their insurance claims. Suppose that you are the director of an insurance adjustment office.
Find out sample size needed to be 95 percent confident that, sample proportion of U.K. annual report graphics which are distorted, is within margin of error of .03 of p.
Recently, students in a marketing research class were interested in the driving behavior of students. Specifically, the marketing students were interested if exceeding the speed limit was related to gender.
Suppose you toss a die 100 times in a row. What is the probability that you see 4 spots between 10 and 20 times?
If 200 of the adults surveyed were in the age category of 24 and under and they provided a standard deviation of $14.50, construct a 95% confidence interval for the weekly average expenditure on fast food for adults 24 years of age and under.
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