Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
1. National data show that, on average, college freshman spend 7.5 hours a week going to parties. President DeRosa doesn't believe that these figures apply at his school; he thinks freshman at his school party less. He takes a simple random sample of 50 freshmen and interviews them. He asks you to analyze his sample data. You determine that a 95% confidence interval for the mean number of hours freshmen spend each week going to parties is (5.7, 7.2).
(a) Explain to the President what is meant by the '95% confidence interval of (5.7, 7.2)
(b) The President wants to test the hypothesis that the mean for his school is different from the national mean at a 5% significance level. Specify the null and alternative hypotheses for this test.
(c) Which test procedure should he use to conduct this test? Why?
(d) Eager to gain favor with the president, you tell him that you can save him lots of time because, based on the confidence interval results already presented, you know what he will conclude and he doesn't have to perform any other calculations. Will he reject or fail to reject the null hypothesis at the 5% significance level? Explain.
Let X be a random variable of the continuous type that has pdf f(x). If m is the unique median of the distribution of X and b is a real constant, show that E(X - bl) = E(X - ml) + 2 [(b - x)f(x) £lx, provided that the expectations exist.
To find the probabilities values of standard normal variable
A class has 13 women and 18 men. If student if selected randomly, determine the probability student is a woman?
A study is made by an auto insurance company to determine if there is a relationship between the driver's age and the number of automobile accident claims submitted during a one-year period. From a sample of 300 claims, the following information w..
How variable is the number of service calls with which Sam's department must deal?
The changing ecology of the swamps in Louisiana has been the subject of much environmental research. One water-quality parameter of concern is the total phosphorous level.
The sample proportion of large gloves for each location is and . (Round your answers to 4 decimal places.)
Can you provide another explanation for this one: Zc/Tc for 86% confidence interval when the sample size 50?
A mathematical placement test is given to all entering freshmen at a small college. A student who receives grades below 35 is denied admission to the regular mathematics course and placed in a remedial class.
Comparisons were made for specific causes of death between mortality rates in workers and U.S white male mortality rates from 1950-1978.
The lifetimes of light bulbs of a particular type are normally distributed with a mean of 370 hours and a standard deviation of 5 hours. What percentage of bulbs has lifetimes that lie within 1 standard deviation of the mean on either side?
How large a sampl.e is needed to estimate the true proportion of home owners who have vegetable gardens to within 4 percentage points with 95% confidence?
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +1-415-670-9521
Phone: +1-415-670-9521
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd