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At the .10 significance level, can she conclude that the mean daily expenses are greater for the sales staff than the audit staff? What is the p-value? (Show all work)
19 percent of the employees in a company have managerial positions, and 29 percent of the employees in the company have MBA degrees. Also, 64 percent of the managers have MBA degrees. Using the prob
Calculate the z-test statistic to test the difference in SAT math scores from students in Delaware and New jersey. A sample of 45 students from Delaware had an average score.
There are 137 tickets in a hat and my name is on 3 of them. If someone draws 20 tickets out of the hat, what is the probability of my name being on one of those 20tickets.
A sample of 45 eggs yields a mean of 1.37 ounces. Assume that the standard deviation is 0.53 ounces what is the margin of error at the 95% confidence level.
Obtain and interpret the 40th percentile for the finishing times and part D) find and interpret the eighth decile for the finishing times.
A population has a mean of 100 and a standard deviation of 20. If you select a single score from this population,on the average, how close would it be to the population mean?
a. Does the sample data provide evidence to conclude the more than 60% of the banks loans are made to persons residing in Crooked Arrow (using alpha=0.01) 1. Formulate the null and alternative hypot
A computer manufacturer purchases microchips from a world-class supplier. The buyer has a lot tolerance proportion defective of 10 parts in 5,500, with a consumer's risk of 17 percent. If the comput
When 297 college students are randomly selected and surveyed, it is found that 126 own a car. Find a 99% confidence interval for the true proportion of all college students who own a car.
Find the probability that the mean aptitude test score for a randomly selected group of 150 8th graders is between 101.5 and 98.5.
Their scores follow. For the constant sound group: 1, 10, 1, 10, 1, 9, 7, 3. And for the no sound group: 4, 3, 6, 4, 5, 8, 4, 9. A. Assume that the standard deviations are equal and find the test st
He discovers that the average miscellaneous expense is $45.00 with a standard deviation of $16.00. What percent of his expense in this category would he expect to fall between $38.60 and $57.80?
Why does the sample size play such an important role in reducing the standard error of the mean? What are the implications of increasing the sample size?
A research firm conducted a survey to determine how much money married couples spend each year on movies. What is the 95% confidence interval for the population mean?
of all 3 to 5 year old children, 56% are enrolled in school. A sample of 500 children age 3 to 5 year old is ramndom selected. Find the probability that at least 250 children are enrolled in school.
During a 36-year period, lightning killed 3,239 people in the U.S. Assume that the rate holds true today and is constant throughout the years, find the MEAN and the probability that no one in the U
The scores are normally distributed with a mean of 165 and a standard deviation of 17. If only the top 20% of the soldiers are selected, what would the cutoff score be?
Why does the DOT have the same driver at the wheel for the entire test? (d) Do the data meet the conditions necessary for a t-interval for the mean stopping distance?
There are many ways to attack this problem in the HW. If you would like the normal distribution table so you can draw the pictures (my preferred way of learning) then I suggest you bookmark this sit
Prepare a report for the customer that presents the expected value in points of each throw of the darts, and then present a graphic representation of a at least three plans relating cost per dart, c
It was found that in a sample of 215 teenage boys, 59% of them have received speeding tickets. What is the 95% confidence interval of the true proportion of teenage boys who have received speeding t
based on a random sample of 16 customer transactions the mean waiting time is 6.3 minutes and the standard deviation is 2 minutes per customer. what is the value of the test statistic?
(a) Formulate a hypothesis statement regarding our research issue. (b) Perform a regression hypothesis test on the data and interpret the results of the test.
What is the maximum water producing capacity that the station should keep on line for this hour so that the demand will have a probability of only 0.01 of exceeding this production capacity?