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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 researchers need to know before prescribing this drug widely?
Provide a 99% confidence interval for the population proportion of college students who worked to pay for tuition and living expenses.
A flour mill produces flour in small bags before distributing them to wholesalers. The average weight of each bags is 8 kg with a standard deviation of 0.5 kg.
The results of a district spelling bee for both girls and boys are normally distributed. the 60 girls have a mean score of 71 with a standard deviation of 6, while the 50 boys have a mean score of 66 points with standard deviation of 5 points.
If profit earned in the manufacture and sale of X units of a product is P dollars where: P = 10X - 0.001X2
Two components of reliability 0.95 are in parallel and this subsystem is connected in series to a component with a reliability of 0.90. Calculate the overall reliability of this system.
The professor wishes to use a random-number table to determine which letter choice should correspond to the correct answer for a question.
Is there a significant difference in sales dollars of hats between the west side and east side stores at the 5 percent level of significance? (a) State the hypotheses. (b) State the decision rule and sketch it. (c) Find the test statistic and stat..
Pick a random sample of 50 homes from the enclosed 90 cases. Double the asking price and selling price and use this data to develop three predictive models:
The time between arrivals of cars at the Petroco Service Station is defined by thw following probability distribution.
The following is sample information. Test the hypothesis at the .05 significance level that the treatment means are equal.
Looking at the data, you suspect that the manufacturer is incorrect in its label claim. You want to perform hypothesis testing to prove or disprove it.
Assume that the population of heights of male college students is approximately normally distributed with mean m of 68 inches and standard deviation s of 3.75 inches. A random sample of 16 heights is obtained.
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