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A local rental car agency has 200 cars. The rental rate for the winter months is 60%. Find the probability that in a given winter month at least 140 cars will be rented. Use the normal distribution to approximate the binomial distribution.
In the Distance problems, the kids are given a Rate (speed) that a vehicle is going, as well as a Time that the vehicle travels, and asked to calculate the Distance travelled. In the Rate problems they are asked to compute Rate from the other two ..
The following frequency table determine the ages of 100 shoppers at the local grocery store. Compute the sample mean for this data (mean for the grouped data).
If out of a random sample of college students expressed an intent to vote, can the aide's estimate be rejected at the level of significance? Perform a one-tailed test.
Times spent studying by students in the week before final exams follow a normal distribution with standard deviation 8 hours. A random sample of four students was taken in order to estimate the mean study time for the population of all students.
A skeptical paranormal researcher claims that the proportion of Americans that have seen a UFO is less than 1 in every one thousand. State the null hypothesis and the alternative hypothesis for a test of significance.
A much larger sample would be needed to estimate the proportion of the U.S. Army's 2.4 million active duty and reserve personnel who approved the repeal than would be needed to estimate the proportion of the Marine Corp's 200,000 personnel who fel..
The store used ANOVA to test if the mean sales for each credit card were equal. What are the degrees of freedom for the F statistic?
Last school year, student body of a local university consisted of 30% freshmen, 24% sophomores, 26% juniors, and 20% seniors. A sample of 300 students taken from this year's student body showed the following number of students in each classificati..
Describe a business situation where you would want to use a t-test. Why would you choose that test? What would you expect to show by doing this?
A random sample of n=31 households is asked the number of TV sets in the household. The responses are-What is the mean number of TVs?
Create a real-world situation or problem that could be addressed using an independent- or related-samples t test. Create this situation or problem, that clearly identify the independent and dependent variables to study
It has been claimed that women live longer than men; however, men tend to be older than their wives. Ages of sixteen husbands and wives from England were obtained. The null hypothesis of equality of means is rejected. What conclusion can be made f..
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