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A high school counselor wishes to see if the average number of dropout in his school is 18.He reviews the last 17 years and finds that the number of dropouts each year is as shown. Test her claim at the .01 alpha level.
12 18 24 16 21 20 18 19 19 22 25 16 18 19 19 20 23
Test the teachers hypothesis that there is a significant difference between the pre and post tests.
Test the hypothesis that there is significant difference on the post test scores between sections A and B.
The diameters of ball bearings are distributed normally. The mean diameter is 74 millimeters and the variance is 16. Find the probability that the diameter of a selected bearing is less than 78 millimeters.
An automobile manufacturer has a new model that they claim gets 27 miles per gallon. A consumer testing agency chooses 50 of these cars and finds that the sample mean is 25 miles per gallon and the sample standard deviation (s) is 3 miles per gall..
Write a one-page report to Ms. Gupta presenting your conclusions regarding the market performance of Brand 1.
Based on this sample information find out what percent of variation in starting salaries is described by GPA, and find out the equation that would forecast salary from GPA. Give a scatter plot.
What is a normal distribution? What is a Z-Value? Can you provide and example of how they relate?
How does bell-shaped curve for sampling distribution of sample means for samples of size n =120 compare tobell-shaped curve for sampling distribution of sample means for samples of size n =95?
Solve linear program graphically
The paired data below consist of the test scores of 6 randomly selected students and the number of hours they studied for the test.
Give a brief definition and an example of the following: What does the correlation coefficient r describe? What about r squared?
The director of admissions at Kinzua University in Nova Scotia estimated the distribution of student admissions for the fall semester on the basis of past experience.
The GMAT scores of MBA students is assumed to be distributed normally with a mean of 530 and a standard deviation of 80. The GMAT scores of ten students are selected randomly.
If we select a crew member at random, what is the probability the crew member earns:
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