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A study ia conducted to compare an experimental treatment with a control treatment i reducing join pain in patients with arthritis. 200 patients are randomly assigned to the treatment group or contral. of the 100 patients assigned to the treatment group, 54 reported improvement in thier symtopms. ofthe 100 patients assigned to the control group, 42 reported imporvement in their symptoms. test the claim that the proportion of the people reporting imporvement was higher amoung the experimental treatment group than the control treatment. use z= 1.96.
A professor of math refutes the claim that the average student spends 3 hours studying for the midterm exam. Which hypothesis is used to test the claim?
Suppose the p-value for these test is 0.03. Is the difference in percentages at a 5% level? Explain. Suppose the p-value for this test is 0.03. Is the difference in percentages significant at a 1% level? Explain. What is the overall (weighted) sample..
If two of totes don't conform to purity requirements, determine the probability that at least one of nonconforming totes is selected in sample?
What are the primary differences between investments in corporate stock versus corporate bonds? Since bonds pay interest, does that imply the individuals risk exposure is less for investing in bonds rather than stock?
Sketch density curves that might explain distributions with fallowing shapes: symmetric, but with two peaks( i.e., two strong clusters of observations)
Determine the maximum error of the estimate, E. Determine the confidence level used for the given confidence interval.
The data obtained are shown in the Excel worksheet Problem 4 and below. You are to test to determine if the type of ticket and the type of flight are independent or not. Use alpha = .05
A committee of three is selected at random from a set consisting of five Democrats, eight Republicans, and two Independents.
Your financial advisor sees this and tells you there is a 100% chance XYZ stock will gain over the 2-month period. Would you continue to use this financial advisor? Explain.
At.05 level of significance test to find out if number of breakdowns is independent of shift.
If there are 12 business-class passengers and 50 tourist-class passengers on a particular flight, what are the expected value of total luggage weight and the standard deviation of the total luggage weight?
Calculate a 3-period moving average for period 7. Compute the MAD of the forecast.
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