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A researcher wants to see if gender plays a role in whether a college student smokes. An analysis of survey data yields the following contingency table, chi-squared value, and p-value. Tabulated statistics: Gender, Smoke Cigarettes Rows: Gender Columns: Smoke Cigarettes No Yes All Female 119 7 126 Male 89 10 99 All 208 17 225 Cell Contents: Count Pearson Chi-Square = 1.640, DF = 1, P-Value = 0.200 a. What is the risk of smoking for Female students? b. What is the risk of smoking for Male students? c. What is the relative risk of males to females? d. What is the increased risk of males over females?
Drug Store News (September2002) provided data on annual pharmacy sales for the leading pharmacy retailers in the United States. Show a stem-and-leaf display.
As it is a 2 _ 2 table, try also two-tailed two-sample z test for ð1 = ð2 and verify that z2 is same as your chi-square statistic. Which test do you favour? Describe why?
Identify a pair of variables for which you would expect to see a strong correlation but not a cause-and-effect relationship. Suggest an explanation for the association.
Find out the best predicted household size given that the household discards 5.00 lb of plastic.
Ran parts and found 1% defective(1 out of 100). Made a change to the process and want to rerun parts. How many parts do we need to check (and find 0% defective) for a 90% confidence factor
Given the following data on Asian and European Share of U.S. Light Truck Sales(1990-2003): Which trend model is best, and why? If none is satisfactory, explain.
If the sales are $150,000 per month, determine how much the company can expect to receive of this amount.
Suppose you were preparing two-way tables of percentages for the following pairs of variables. How would you run the percentages?
Describe the distribution of sample means (shape, expected value, and standard error) for samples of n=36 selected from a population with a mean of µ=100 and a standard deviation of σ=12.
Determine the values on the 3-sided die so that the outcome probabilities for rolling the two dice described above match exactly the outcome probablities for rolling two standard (6-sided) dice.
Its known that 5% of all AA bateries made by Power Manufactures are defective. AA batteries are sold in packs of 4. Find the probability that a pack of 4 has exaclty 2 defective batteries.
Sketch the distributions involved, and (c) explain your answers to someone who has never had a course in statistics.
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