An ANOVA analysis of the hours of use before burn-out for three brands (A, B, C) of battery-operated emergency lights resulted in a “Reject H0” decision. A post hoc analysis using the Tukey method yielded the results below.  Assuming costs of the three brands are about equal, can one or more of the brands be eliminated from consideration if our goal is to achieve longest life of the batteries?   Tukey HSD results​ (95% levels) Difference 95% Lower Limit 95% Upper Limit Type B – Type A 235 62.767214 407.23279 Type C – Type A 54.75 -117.48279 226.98279 Type C – Type B -180.25 -352.48279 -8.0172141  

The regression equation below has been developed to predict sales at a store. In this equation, y = sales (in $1000s), X1 = competitor’s previous day’s sales (in $1,000s), X2 = population within 1 mile (in 1,000s), and X3 = 1 if radio advertising was used and 0 if no radio advertising was used.                                           

The 95% confidence interval estimate of β1 is closest to:

Use the following narrative to answer questions 7 – 10.  Based on long experience, the director of a museum knows that the historical distribution of visitors to the museum during the week is as follows:   Distribution of visitors Days Mon TUE WED THU FR SAT SUN Total Percentage 10% 10% 10% 10% 15% 25% 20% 100%   To monitor patronage of the museum, the following visitor data has been collected.  Is this evidence to suggest the distribution of museum visitors has changed? Visitor Data Days Mon TUE WED THU FR SAT SUN Total # Visitors 200 215 250 265 410 640 420 2400

Which of the following expressions is the reduced equation for predicting the repair cost of Welding machines specifically?

Use the following narrative and partial One-way ANOVA results shown below to answer questions 15 – 16.    A one-way ANOVA was carried out to determine whether management styles (Authoritarian, Laissez Faire, and Participative) differ among organizations and may potentially affect employee’s job satisfaction. The employees were asked to rate their level of job satisfaction on a 10-point scale.                                          Partial One-Way Anova Summary Source DF SS MS F-Stat Factor * 87.40 * * Error 27 37.40 *   Total 14 *    

Based on the scatter plot below, which of the following regression equations would be most reasonable to model the relationship between X and Y?

Use the following problem description and computer output to answer questions 25 – 30. Fire damage in the United States amounts to billions of dollars, much of it insured.  The time taken to arrive at the fire is critical.  This raises the question, “Should insurance companies lower premiums if the home to be insured is close to a fire station?”  To help make a decision, a study was undertaken wherein a number of fires were investigated.  The distance to the nearest fire station in kilometers (Distance) and the percentage of fire damage (Damage) were recorded. 

What is the value of the pooled variance estimate of σ2? Round your answer to 3 decimal places.

Use the following exhibit that includes several variables related to vehicles to answer questions 48 – 50.  Note that the exhibit shows a small number of cases taken from a very large data set of vehicle data.  The data set included vehicles from seven countries (China, Germany, India, Italy, Japan, Korea, USA) and in seven styles (SUV, Sedan, Hatchback, Convertible, Wagon, Coupe, Minivan).