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. A neurologist wants to detect whether the mean response time for drug-injected rats differs from a control group not injected. The control group has the mean response time of 1.2 seconds. 100 rats are randomly chosen and injected with a unit dose of the drug. The average response time for the injected rats is 1.05 seconds with s = 0.5 seconds. Test the hypothesis at a level a= .01 whether there is a difference in response times.
2. A major car manufacturer wants to test a new engine to determine whether it meets new air-pollution standards. The mean emission m of all engines must be less than 20 parts per million of carbon. Ten engines are manufactured for testing purposes and the emission level of each is determined to be: 15.6 16.2 22.2 20.5 16.4 19.4 16.6 17.9 12.7 13.9. Does the data supply sufficient evidence to allow the manufacturer to conclude this type of engine meet the pollution standard? Test the hypothesis at a level a = 0.01.
3. The National Science foundation, in a survey of 2237 engineering graduate students who earned PhD degrees, found that 607 were US citizens; the majority (1630) of the PhD degrees were awarded to foreign nationals. Conduct a test to determine whether the true percentage of PhD degrees awarded to foreign nationals exceeds 50% at a level a = 0.01.
4. In the past decade intensive anti-smoking campaigns have been sponsored by both federal and private agencies. Suppose the American Cancer Society randomly samples 1500 adults in 1985 and then sampled 2000 adults in 1995 to determine whether there was evidence that the percentage of smokers had increased. The results of two independent surveys found that in 1985, out of 1500 surveyed, 576 were smokers. In 1995, out of 2000 surveyed, 652 were smokers. Does this data indicate that the proportion of smokers decreased over this 10 year period? Test at a level a=0.05.
Create a 90% confidence interval for true mean amount of cholesterol in chicken eggs.
At the .01 level of significance, is the mean grade of the female students higher than that of the males?
Using the .05 level of significance: a) Is there a difference among types of gasoline? b) Is there a difference in the cars?
On a very hot summer day, 5 percent of the production employees at Midland States Steel are absent from work. The production employees are randomly selected for a special in-depth study on absenteeism.
Which of the following Venn diagrams has shaded the event that the contractor wins exactly one of the contracts and evaluate the mean time to complete the entire homework assignment
Findout the 98% confidence interval for true mean. Findout a 98% confidence interval for the cigarette tax in all 50 states.
Brief description of the real-world situation or problem you selected to address, the independent and dependent variables you would study
What happens to the confidence interval and the power of the test at a particular point of interest
The mean television viewing time for Americans is 15 hours per week (Money, November 2003). Suppose a sample of 40 Americans is taken to further investigate viewing habits.
Use a P-value to test the claim about the population mean using the given sample statistics. State your decision for a=0.05. Claim: mean does not = 230
Describe the similarities between an F-ratio and a t statistic. The basic relationship between t statistic and F-ratios can be stated in an equation. What is that equation?
Explain how the power of a hypothesis test is influenced by each of the following. Assume that all other factors are held constant.
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