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Gas Mileage of Cars
The table gives the number of miles per gallon in the city and on the highway for the coupes and compact cars reported to have the best gasoline mileage, according to autobytel.com. Make a scatterplot, using the city mileage as the predictor.
Find the equation of the regression line for predicting the number of miles per gallon (mpg) on the highway from the number of miles per gallon in the city.
Use the equation to predict the highway mileage from a city mileage of 100 mpg. Also find the coefficient of determination and explain what it means. Finally, state which car is an outlier; find the coefficient of determination without the outlier, and comment on it.
Die with 4 sides {1, 2, 3, 4} is tossed 2 times. Let X equal maximum of two observations and let Y equal minimum. Determine joint pmf of X and Y, and correlation coefficient. Are X and Y independent?
consider that the population is normally distributed construct a 95 confidence interval estimate for the population
Construct a time series plot. What type of pattern exists in the data and show the four-quarter and centered moving average values for this time series.
PERSONNEL SELECTION Applicants for temporary office work at Carter Temporary Help Agency who have successfully completed a typing test are then placed.
Calculate the expected payoff from playing this game.
Suppose there are two elementary schools in a county. One school (A) loans all its students a laptop computer for use in classes. The other (B) does not
Based on these values, find the sample size required to provide an estimate of the mean TRAP with a margin of error of 1.5 U/l for 95% confidence.
Discuss why correlations do not necessarily mean causality. Describe two variables that may be highly correlated, but do not indicate causality; and describe under what circumstances correlation leads to causality.
Find a 95% confidence interval for the difference between the proportions of unacceptable assemblies from the two teams.
Using an appropriate statistical test determine if there is a significant association between gender and satisfaction with the new initiative.
A supplier contract calls for a key dimension of a part to be between 1.96 and 2.04 centimeters. The supplier has determined that the standard deviation of its process, which is normally distributed, is 0.04 centimeter.
Estimate the number of workers in the sample who are union members by giving the mean of the relevant distribution (that is, the expectation of the relevant random variable). Do not round your response.
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