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To determine the effect of advertising in the Yellow Pages, Bell Telephone took a sample of 40 retail stores that did not advertise in the Yellow Pages last year but did so this year. The annual sales (in thousands of dollars) for each store in both years were recorded.
a. Estimate with 90% confidence the improvement in sales between the two years.
b. Can we infer that advertising in the Yellow Pages improves sales?
c. Check to ensure that the required condition(s) of the techniques used in parts (a) and (b) is satisfied. d. Would it be advantageous to perform this experiment with independent samples? Explain why or why not.
In recent year, of the 109,857 arrest fro federal offenses, 29.1% were for drug offenses. Use a .01 significance level to test the claim that the drug offense rate is equal to 30%.
Formulate and test an appropriate set of hypotheses to determine if the machine can be qualified. Use a = 0.05. Find the P-value.
Does lovastatin reduce the risk of heart attack? Researchers gave lovastatin to 2,325 people and an placebo to 2,081 people. the average age of both groups in 58 years.
For a normal random variable X with mean 70 and standard deviation 10. Calculate the probability that 60 80}.
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How much does a typical employee and his or her family spend per year on dental expenses? Construct a 95 percent confidence interval for the population mean. Interpret the interval.
a clinical trial is run comparing a new drug for high cholesterol to a placebo. a total of 40 participants are
the marketing manager of a large supermarket chain would like to determine the effect of shelf space in feet on the
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How would you calculate cost of goods sold? What items make up cost of goods sold?
a sample of 40 los angeles pharmacies sells the tamiflu 75mg prescription drug for about 137 for a moth supply s 30.2
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