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To test the effectiveness of a new drug designed to relieve pain, 250 patients were randomly selected and divided into two equal groups. One group of 125 patients was given a pill containing the drug while the other group of 125 was given a placebo. What can we conclude about the effectiveness of the drug if 62 of those actually taking the drug felt a beneficial effect while 41 of the patients taking the placebo felt a beneficial effect? Use ? = 0.05.
Secondhand smoke is somewhat harmful or very harmful. Is there statistically significant evidence against the representative's claim? Why or why not?
Determine the least squares equation. According to this information, what are the estimated sales for 2005? Listed below is the net sales in $ million for Home Depot, Inc. and its subsidiaries from 1993 to 2002.
What are the advantages and disadvantages of the surveying methods you did not used and what type of score did you use why?
At α = .05, is there a difference in variances? Illustrate all steps clearly, including illustration of the decision rule.
The important thing is having a reason for picking the model that you decide on. You should choose a model for overall characteristics like a high R^2 value. Y
1. in a well known quiz show the contestant is asked to choose between door number 1 door number 2 and door
What was the success probability of each O-ring?
three identical opaque urns each contain four marbles of identical size and weight. one urn contains 3 black marbles
If you were to draw a scatter plot of the number of women in the workforce versus the number of Christmas trees sold in the United States for each year between 1930 and the present
1. A developer wants to claim that his new "green" home design results in lower electricity use than in conventional homes. His 2,000 square foot model home uses 1,200 kilowatt hours per month on average.
a shipment of 250 netbooks contains 3 defective units. determine how many ways a vending company can buy three of these
The quality-control manager at a light bulb factory needs to determine whether the mean life of a large shipment of light bulbs is equal to 375 hours. The population standard deviation is 100 hours.
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