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1. A market research company wishes to find out whether the population of students at a university prefers brand A or brand B of instant coffee. A random sample of students is selected, and each one is asked to try first brand A and then brand B, or vice versa (with the order determined at random). They then indicate which brand they prefer. The response variable is
A. whether brand A or B is tried first.B. which brand they prefer.C. the two brands of coffee.
2. A researcher is interested in the cholesterol levels of adults in the city she lives in. A free cholesterol screening program is set up in the downtown area during the lunch hour. Individuals can walk in and have their cholesterol determined for free. One hundred and seventy-three people use the service and their average cholesterol is 217.8. The sample obtained is an example of
A. a simple random sample since the experimenter did not know beforehand which individuals would come to the screening.B. a stratified sample of high and low cholesterol individuals.C. a sample probably containing bias and undercoverage.
3. A sample was taken of the salaries of four employees from a large company. The following are their salaries (in thousands of dollars) for this year.
33 31 24 36
The variance of their salaries isA. 5.1.B. 26.C. 31.
Results are comparable to what could be expected in human serum. Are true binding percentages for five antibiotics tested all equal? Let α = 0.05.
State the alternative hypothesis that would be used to determine if Brand A has a higher proportion of defective smoke detectors than Brand B. Calculate the test statistic for determining if a difference exists between the failure rates of the two..
Briefly state the evaluation criteria for using a computed regression equation; specifically, comment on the coefficient of determination, correlation coefficient, and standard error of the estimate.
Can Mr. Rutter conclude that the mean weight of the bags is less than 50 pounds? Use the 0.1 significance level. In a brief report, tell why Mr. Rutter can use the z distribution as the test statistic.
A population consists of the following four values: 8, 10, 12, and 16. From this population, there are 6 different samples of size 2. The means of the 6 samples of size 2 are: 9, 10, 12, 11, 13, and 14. Compute the mean of the distribution of the ..
Make a graph to visualize the problem and state, without doing the calculations, whether the p-value of the test
Create a 95% confidence interval for the population mean days absent for sickness based on this sample. Select the answer closest to your results.
If two events are collectively exhaustive, what is the probability that both occur at the same time?
If there is a difference between the two groups of scores. Briefly explain how the difference may have been caused by the treatments.
Suppose we have observations x1, x2, . . . , xn. Prove that the sum of deviations of the observations from their arithmetic mean is always equal to zero.
In a simple random sample of 30 days, what is the probability that the mean number of daily emergency admissions is between 75 and 95?
Is sample of 25 papers large adequate to give a good estimate of mean score of all 42,000 students on this exam problem? Explain your answer.
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