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Test the significant difference between the two population proportions.
Does lovastatin (a cholesterol-lowering drug) reduce the risk of heart attack? In a Texas study, researchers gave lovastatin to 2,325 people and an inactive substitute to 2,081 people (average age 58). After 5 years, 57 of the lovastatin group had suffered a heart attack, compared with 97 for the inactive pill. a) State the appropriate hypotheses.
b) Obtain a test statistic and p-value. Interpret the results at = .01.
c) Is normality assured?
d) Is the difference large enough to be important?
e) What else would medical researchers need to know before prescribing this drug widely?
A company has developed the new battery, but the average lifetime is unknown. In order to estimate the average, a sample of 150 batteries is tested and an average lifetime of this sample is found to be 250 hours.
Evaluate true mean delivery time to within 5 minutes at 90% reliability level? Suppose that standard deviation for delivery times is 18.2 minutes.
Evaluate z statistic for the Wilcoxon rank sum test, standard deviation for the Wilcoxon rank sum test and P-value for the Wilcoxon rank sum test
Which statement is true for a statistical study?
Use normal approximation to determine probability that x = 2. Illustrate all work.
Illustrate the regression model and predict it. The following table shows the yearly maintenance costs for several cars, as well as their age.
Is there evidence to suggest a difference in the mean waiting times at the four body shops?
Solution throughout graphical method. Produced by a company linear programming model is used to describe the production schedule.
What is the P-value of the test, assume the standard deviation is 3 years, a 95% confidence interval for the average time
The sample mean is 2.59 and the sample standard deviation is .66. Conduct the following test using 95% level of confidence.
In a regression model involving 30 observations, the following estimated regression equation was obtained:
Should the finite-population correction factor be used? Why or why not?
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