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Easy-Fly Airline took a random sample of 25 flights to determine if the mean time it takes for luggage to reach the travelers departing from a flight is less than 15 minutes. The sample mean was found to be 13.8 minutes with a standard deviation of four minutes.
a. Using a significance level of .05, what conclusion can be reached based on the random sample?
b. What assumption about the data is necessary for the hypothesis test to be valid in this situation?
What are the null and alternative hypotheses in this situation?
Students in a statistics class at a large state university were given the survey in which one question asked was age (in years); one student was a retired person, and her age was an "outlier".
Give the expected value and standard deviation of defective shoes in the ShoeFit store order.
The manager of a department store wants to determine what proportion of people who enter the store use the store's credit cards for their purchases.
Create a 99 percent confidence interval for difference in means between Line B and Line C.
At least half the patients are under 15 years old? First, explain how this can be modeled as a binomial distribution with 8 trials, where success is visitor age is under 15 years old and the probability of success is 20%.
In the past HR uses an average of 25 vacation days per worker in order to make available man-hour and payroll predictions. Is there evidence to show that the number of vacation days decreased over the past year? Use alpha = .05
Calculate the probability of a value between 75.0 and 90.Calculate the probability of a value of 75.0 and less.
Below are revenue and profit (both in $ billions) for nine large entertainment companies.
Which of the following assumptions is not made for the F-test for comparing three or more means?
Make an interval estimate the population means score for the daycare children so that you are 95% confident that the true mean is in your interval.
How large sample size must be taken to be 95% confident.
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