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Question: For each of the following, explain whether the study summary describes an interacting variable or a confounding variable.
a. A comparison of the mean grade point averages of male and female students finds more difference for fraternity and sorority members than for students who are not fraternity and sorority members.
b. A study finds that wine drinkers tend to have better health than beer drinkers but also finds that wine drinkers tend to smoke less than beer drinkers.
c. It is found that drawing a happy face on a restaurant bill increases the mean tip percentage for female servers but does not increase the mean tip percentage for male servers.
Compute the mean and standard deviation of the random variable X, the number of smokers who started before 18 in 200 trials of the probability experiment.
a sample of 144 students is taken from a population of 2000 high school students to estimate the proportion of students
A foreman for a firm admits that on 10% of his shifts he forgets to shut off the machine. This causes the machine to overheat and the probability that a defective mold will be produced during the early morning run increases from 2% to 20%.
in a particular city the average salary of secretaries is 30000 per year. secretaries at company a claim that they are
Use the level and power values for the paired t test and Wilcoxon signed-rank test given in Table 6.18 to answer the following questions:
a manufacturer of disk drives for notebook computers wants a mtbf of at least 50000 hours. recent test results for 15
Each of the variables in this analysis was measured by having the students complete a questionnaire. Discuss how this might affect the results. How well do you think that these results can be applied to other populations of high school students?
State your hypothesis and conduct a hypothesis testing using a significance of 0.10 What is your conclusion? And why? Interpret it. Please show all formulas and work!
the standard deviation is $400. Suppose 90 claims are filed in one week. What is the probability that the average (sample mean) is more than $1900?
A two-tank system containing a heated liquid has the model shown in Figure DP9.9 (a), where T0 is the temperature of the fluid flowing into the first tank and T2 is the temperature of the liquid flowing out of the second tank.
a) What is the probability that 4 or more live in poverty? b) What is the probability that 3 live in poverty? c) What is the expected number (mean) that live in poverty
(a) Let N(t) be the number of system failures in the interval [0,t]. In what case(s) will the stochastic process {N(t),t ≥ 0} be a renewal process if the random variables Sk do not all have an exponential distribution? Justify.
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