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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.
the mean income per person in the united states is 40500 and the distribution of incomes follows a normal distribution.
the administration at western is curious in determining the average gpa of its students. previous studies have shown
The Aloha Banking Co. is studying ATM use in suburban Honolulu. A sample of 30 ATM's showed they were used the following number of times yesterday.
The Central Limit Theorem states that the sampling distribution of means is:
Standard deviation of this poll is 4%. What would be standard deviation if sample size were increased from 83 to 190?
The slopes of the lines parallel to X axis and Y axis are. The slope of the line parallel to the line y = 10x and passing through origin
An investor plans to develop a regression model for the appraisal value (in thousands of dollars) of property in her city (Y) based on 5 numerical variables:
(a) Use Excel to compute both a three-period and a five-period moving average time series of company liquidations. (b) Plot the original time series of company liquidations and the three-period and five-period moving average values on the same grap..
a. Would the results of this survey be considered a random sample? b. What type of bias might be associated with a data collection system such as this? Discuss what options might be used to reduce this bias potential.
Comment on the relative merits of using a .95 confidence interval for addressing the effectiveness of the antipollution device in Exercise.
a business person looking at data wonders does the average price for medium fuel in the united states differ
Site preparation for new housing developments for tracts of 40 houses is normally distributed with a mean of 250 workdays and a standard deviation of 25 workdays.
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