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There is some evidence that men have an enzyme that begins to metabolize alcohol in the stomach. Women have lower levels of the enzyme, which means that alcohol passes directly through the stomach and into the bloodstream. As a result, women have a stronger reaction to alcohol and are affected more quickly (Lieber, 1990). To evaluate this phenomenon, a re-searcher obtains a sample of n = 10 men and a corresponding sample of n = 10 women. Each individual is tested on a driving simulator task to measure mental alertness. Then, equivalent doses of alcohol are given to each participant (adjusting for body weight), and the driving simulator test is repeated 30 minutes later.
a. For the sample of men, performance on the simulator task declined by an average of 2.9 points with s = 4.1. Is this a statistically significant change? Use a two-tailed test with = .05.
b. For the women, performance declined by an average of = 6.4 points with s = 5.2. Is this a statistically significant change? Use a two-tailed test with = .05.
If we select a crew member at random, what is the probability the crew member earns:
Solve this problem explicitly using all five steps of hypothesis testing, and illustrate your answer with a sketch showing the comparison distribution
Below are revenue and profit (both in $ billions) for nine large entertainment companies.
Identify the sampling distribution to be used: the standard normal distribution or the Student's t distribution. Find the critical value(s).
A company makes camshafts. The camshaft lengths need to be within a certain tolerance or they will not fit. They have produced x bar and s charts
Find the mean, median, mode, and midrange for these data.
Type the above data into the SPSS Data Editor window, or save this file as an unformatted text file and write SPSS syntax to read it in.
Formulate the hypotheses that can be used to test the validity of the brokerage firm executive's claim.
A random sample of 100 oranges is gathered and the mean diameter obtained was 5.12. If another sample of 100 is taken, what is the possibility that its sample mean will be greater than 5.12 inches.
Determine the probability that their SAT scores will differ by more than 50 points?
Find the percent of a standard Normal model found in the given region. Round to the nearest hundredth of a percent.
Use the relative frequency approach to construct a probability distribution for the number of tests taken.
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