Before being released to market, a drug company tests a new allergy medication for potential side effects.  A random sample of 160 individuals with allergies was selected for the study.  The new allergy medication was randomly assigned to 80 of them, and another popular allergy medication already on the market (Brand C) was assigned to the rest.  Out of the 80 given the new allergy medication, 14 reported drowsiness; 22 of the 80 taking Brand C reported drowsiness.  The 95% confidence interval for the difference in proportions reporting drowsiness is -.028 to .228.  Which of the following statements is correct?

All else being equal, increasing the level of confidence desired will ________________________ .

Which of the following is not an assumption and/or condition required for constructing a confidence interval for the proportion?

When using a plot of residuals (y-axis) vs. fitted value of the dependent variable, a plot with no pattern indicates that the:

Data were collected on the following variables:  turnover rate, job growth, number of employees, and innovative index and fit in a model to explain Turnover Rate.  To check for the possibility of collinearity, a regression among predictor variables job growth and employees predicting a third predictor variable, innovative index, was run and was found to have an R2 = 52.5%. The Variance Inflation Factor (VIF) for the predictor variable Innovative Index is ________________________ .

Data were collected for a study investigating what factors affect the size of company bonuses.  The number of employees at the company and whether or not the employees were unionized (1 = yes, 0 = no) was included in two competing multiple regression models.  Which of the following statements is true?  

Selling price and amount spent advertising were entered into a multiple regression to determine what affects flat panel LCD TV sales.  The adjusted R2 value was reported as 83.3%.  This means that ________________________ .

Before being released to market, a drug company tests a new allergy medication for potential side effects. A random sample of 160 individuals with allergies was selected for the study.  The new allergy medication was randomly assigned to 80 of them, and another popular allergy medication already on the market (Brand C) was assigned to the rest.  Out of the 80 given the new allergy medication, 14 reported drowsiness; 22 of the 80 taking Brand C reported drowsiness.  The 95% confidence interval for the difference in proportions reporting drowsiness is -.028 to .228.  Which of the following statements is correct?

A small independent organic food store offers a variety of specialty coffees.  To determine whether price has an impact on sales, the managers kept track of how many pounds of each variety of coffee were sold last month.   PRICE PER POUND POUNDS SOLD   $ 3.99 75   $ 5.99 60   $ 7.00 65   $ 12.00 45   $ 4.50 80   $ 7.50 70   $ 15.00 25   $ 10.00 35   $ 12.50 40   $ 8.99 50       Mean $ 8.75 54.50 Standard Deviation $ 3.63 18.33 Correlation -0.927   Based on the data and summary statistics shown below, the slope of the estimated regression line that relates the response variable (monthly sales) to the predictor variable (price per pound) is ________________________ .

Data were collected on company bonuses, the number of employees at the company, and whether or not the employees were unionized (1 = yes, 0 = no) on a sample of 30 randomly selected.  According to the multiple regression model below, at α = .05 we can conclude that ________________________ .