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Question: An article in Science News reported on a study to compare treatments for reducing cocaine use. Part of the results are short-term psychotherapy that offers cocaine abusers practical strategies for maintaining abstinence sparks a marked drop in their overall cocaine use. . . . In contrast, brief treatment with desipramine-a drug thought by some researchers to reduce cocaine cravings-generates much weaker drops in cocaine use. (Bower, 24, 31 December 1994, p. 421)
a. The researchers were obviously interested in comparing the rates of cocaine use following treatment with the two methods. State the null and alternative hypotheses for this situation.
b. Explain what the two types of error could be for this situation and what their consequences would be.
c. Although no p-value is given, the researchers presumably concluded that the psychotherapy treatment was superior to the drug treatment. Which type of error could they have made?
assuming that ssy is constant which of the following correlations would have the smallest ssresidual?please explain
Are stock splits beneficial to stockholders? SNL Securities studied stock splits in the banking industry over an 18-month period and found that stock splits tended to increase the value of an individual stock holding.
you calcuate the chi-square test statistic in a test of independence and determined that xsup2 -4.23 with 10 degrees
someone suggests that the lifetime t in days of a certain component can be modeled with the weibull distribution with
The sample mean has been calculated as 240.0. Construct and interpret the 90% and 95% confidence intervals for the population mean.
What assumption about the population distribution is needed in order to conduct the t test in (a)?
What is the probability of selecting a family that has either a visa card or an american card? 2. if a family has a M/C, what is the probability that it has a visa cardd? 3. If a family has a visa card, what is the probability Have to show work in ex..
Which supplier and which shipping quantity will provide the lowest costs for Eight Flags and Which supplier and shipping quantity will provide the lowest total cost for Horizon Cellular?
What is the slope of the line? Interpret the slope in terms of how mean January temperature is related to change in latitude.
The average Saturday attendance at a movie theater is 974 people with a standard deviation of 54 people. A random sample of 39 Saturdays is selected.
Determine the most economical monthly shipping schedule. Provide a table showing the routes and total costs.
in a test of a gender-selection technique results consisted of 276 baby girls and 252 baby boys. based on this
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