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Does alcohol consumption cause increased cravings for cigarettes? Research at Purdue University suggests this is so (see CNN.com web site article "Researchers Find Link Between Cigarette Cravings and Alcohol," dated June 13, 1997). In an experiment, 60 heavy smokers and moderate drinkers were divided into two groups. One group drank vodka tonics and the other group drank virgin tonics (tonic water alone), but all subjects were told they were drinking vodka tonics. The researchers then measured the level of nicotine cravings (by monitoring heart rate, skin conductance, etc.). Those who had consumed the vodka tonics had 35% more cravings than those who did not. Assuming that the assignment of subjects to the treatment (vodka) and control groups was made at random, do you think there are any confounding factors that would make conclusions based on this experiment questionable?
Compute and compare the proportions of positive cases for the two exposure levels. What would be your conclusion? Calculate the odds ratio associated with high exposure. Does this result support your conclusion in part (a)?
Verify that the fitted values have the same mean as the actual y-values, and that the residuals have mean zero and show that the variance of the fitted values plus the variance of the residuals adds up to the variance of y. Find the R-squared.
Compute a two-sided 90% confidence Interval estimate for µd.
Construct a 95% confidence interval estimate for the population mean turnover time. Interpret the interval constructed in (a). Do you think the quality improvement project was a success?
serum ferritin is used in diagnosing iron deficiency. in a study conducted recently researchers discovered that in a
Ninety-eight heterosexual couples, at least one of whom was HIV- infected, were enrolled in an HIV transmission study and interviewed about sexual behavior.A summary of condom use reported by heterosexual partners. How strongly do the couples agre..
If the packets are sold in multi-packs containing six packets, what is the distribution of the number of prizes in a randomly chosen multi-pack?
the number of people arriving for treatment at an emergency room can be modeled by a poisson process with a rate
several statistical tests have a way to measure effect size. what is this and when might you want to use it in looking
For an independent-measures ANOVA comparing three treatments with a sample of n = 5 in each treatment, what is the critical value for the F-ratio using a = .05?
a manufacturer of watches would like to examine preferences for digital versus analog watches. a sample of n200 people
There is significant evidence, alpha =0.05, to show that there is a difference in the proportions of patients who show improvement between treatments 1 and 2
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