Questions from Applied Statistics

Q: In a study of paint peel problems, a regression was suggested

In a study of paint peel problems, a regression was suggested to predict defects per million (the response variable). The intended predictors were supplier (four suppliers, coded as binaries) and subs...

Q: A hospital emergency room analyzed n = 17,664 hourly observations

A hospital emergency room analyzed n = 17,664 hourly observations on its average occupancy rates using six binary predictors representing days of the week and two binary predictors representing the 8-...

Q: Using test data on 20 types of laundry detergent, an analyst

Using test data on 20 types of laundry detergent, an analyst fitted a regression to predict Cost Per Load (average cost per load in cents per load) using binary predictors Top Load (1 if washer is a t...

Q: A researcher used stepwise regression to create regression models to predict Birth

A researcher used stepwise regression to create regression models to predict Birth Rate (births per 1,000) using five predictors: LifeExp (life expectancy in years), InfMort (infant mortality rate), D...

Q: A sports enthusiast created an equation to predict Victories (the team’s

A sports enthusiast created an equation to predict Victories (the team’s number of victories in the National Basketball Association regular season play) using predictors FGP (team fi...

Q: An expert witness in a case of alleged racial discrimination in a

An expert witness in a case of alleged racial discrimination in a state university school of nursing introduced a regression of the determinants of Salary of each professor for each year during an 8-y...

Q: Analysis of a Detroit Marathon (n = 1,015 men

Analysis of a Detroit Marathon (n = 1,015 men, n = 150 women) produced the regression results shown below, with dependent variable Time (the marathon time in minutes) and predictors Age (runnerâ...

Q: Using test data on 43 vehicles, an analyst fitted a regression

Using test data on 43 vehicles, an analyst fitted a regression to predict CityMPG (miles per gallon in city driving) using as predictors Length (length of car in inches), Width (width of car in inches...

Q: If a random experiment whose success probability is .20 is repeated

If a random experiment whose success probability is .20 is repeated 8 times, find the probability of (a) exactly 3 successes; (b) more than 3 successes; (c) at most 2 successes. (d) Which probability...

Q: (a) Use Excel’s function =NORM.INV(RAND

(a) Use Excel’s function =NORM.INV(RAND(),0,1) or Excel’s Data Analysis > Random Numbers to generate 100 normally distributed random numbers with a mean of 0 and...