Stats Help for College-level Students

Experimental design & ANOVA

Is there any difference in the average accuracy level after differing amounts of computer intensive work? b). Is there any difference in the average accuracy level to complete the task for the right hand versus the left hand? c). Is there a significant interaction effect? d). What is your recommendation to this manager? ...continues

Regression Analysis

In trying to look at the effects of shopping center expansion, the Commerce Department decided to look at the relationship between the number of shopping centers and the retail sales for different states in the same region. It collected the data for the North Central states in the U.S. and found the following:(PLEASE SEE ATTACH ...continues

Regression Analysis

How much does advertising impact market penetration? To assess the impact of advertising in the tobacco industry, a study looked at the amount of money spend on advertising a particular brand of cigarettes and brand preference among adolescents and adults. The data are shown below:(PLEASE SEE TABLE ATTACHED) a). Look at the ...continues

Scatter/Regression Steps Problem

Pls help me thru the steps below:(1). In a study about postage tariffs and revenue, the European Economic Community wanted to look at the relationship between the number of postal employees in a country and the amount of domestic mail that was processed. They collected data for six different countries and found Country Number o ...continues

Scatter Pot; Regression

(1). In a study about postage tariffs and revenue, the European Economic Community wanted to look at the relationship between the number of postal employees in a country and the amount of domestic mail that was processed. They collected data for six different countries and found Country Number of Staff Domestic Traffic ( ...continues

scatter plot & least squrares regression line

a. Create a scatter plot of the data. Do you think that there is a linear relationship between number of kilometres traveled and the number of cars? b. Find the least-squares regression line for the data. Interpret the value of the slope. c. Does the intercept make sense for these data? Why or why not? d. Plot the regre ...continues

Plot/Regression line

a. Create a scatter plot of the data. Do you think that there is a relationship between the number of stations that a company owns and the revenues generated by radio? b. Find the linear regression line for the data. c. Use the regression line to predict the radio revenues for Chancellor and Westinghouse/Infinity. Whi ...continues

Regressional Model - asap

Consider the regression model you found for the data on the number of postal workers in a country and the amount of mail processed. a. Make a plot of the residuals versus the values of the independent variables. b. What does this lead you to believe about the appropriateness of the linear model? c. Now plot the residual ...continues

Distribution graph

Look at the model you found for the data on the number of shopping centers and retail sales for the North Central states. a. Make a plot of the residuals versus the independent variable. b. From the plot, does it appear that a linear model is appropriate? c. Looking at the residual plot, do you think that the assumption ...continues

Populations

Concrete blocks are to be used in the foundations of several buildings. The specifications state that the minimum arithmetic mean compressive strength of a sample of blocks must be 1,000 pounds per square inch (psi). If two companies submit samples of blocks that have mean compressive strengths over the minimum (1,000 psi), then ...continues