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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?
Larry Jacava is considering producing a novelty item for golfers that will be sold through pro shops. Larry has decided on a selling price of $3.50 for the item. The item's variable cost of production is $2.00 per unit with a fixed cost of $3,750.
A Poisson distribution was fitted to data for the number of cars crossing a bridge in forty successive 6-minute intervals of time. The sample mean was calculated from the data to be ??¯ = 2.875 and this value was used as an estimate of the populat..
State the null hypothesis and the alternate hypothesis. State the significance level. State the decision rule. Give the formula for the test statistic.
what are your thoughts and research regarding issues facing us? what decision making process needs to be implemented? i
Write a hypothesis that you might test to compare two or more samples in your example. Indicate which hypothesis test you would use and the samples you would select.
Sun Love grapefruit growers have determined that the diameters of their grapefruits are normally distrubuted with a mean of 4.5 inches and a standard deviation of 0.3 inches.
(a) Give an example where Sn converge a.s., but are not L1-bounded. (b) If |X j |≤ 2 a.s. for all j , and Sn converges a.s., show that Sn converges in L2. Hint: Use the three-series theorem (9.7.3).
about 12 of the adult mexican-americans have been diagnosed with diabetes. if you were to randomly sample the
The Z-score cutoff (or cutoffs) on the comparison distribution at which the null hypothesis should be rejected.
the owner of a donut shop wishes to determine the best mix for her three products zingers crullers and eacuteclairs.
In testing the equality of the two means below, what is the test statistic? (Use the unequal variances formula)
A political science professor is interested in finding out whether there is a relation between political affiliation and attitude towards a recent supreme court ruling about challenges to federal affirmative-action programs.
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