QUESTION :

Project C Statistics, statistics homework help

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Question description

Using

MINITAB, perform the regression and correlation analysis for the data on income(Y),

the dependent variable, and credit balance (X), the independent

variable, by answering the following.

1.

Generate a scatterplot for income ($1,000)

versus credit balance($), including the graph of the best fit line. Interpret.

2.

Determine the equation of the best fit

line, which describes the relationship between income and credit balance.

3.

Determine the coefficient of correlation.

Interpret.

4.

Determine the coefficient of determination.

Interpret.

5.

Test the utility of this regression model

(use a two tail test with α =.05). Interpret your results, including the

p-value.

6.

Based on your findings in 1–5, what is

your opinion about using credit balance to predict income? Explain.

7.

Compute the 95% confidence interval for beta-1

(the population slope). Interpret this interval.

8.

Using an interval, estimate the average

income for customers that have credit balance of $4,000. Interpret this

interval.

9.

Using an interval, predict the income for

a customer that has a credit balance of $4,000. Interpret this interval.

10.

What can we say about the income for a customer that has a credit balance of

$10,000? Explain your answer.In an

attempt to improve the model, we attempt to do a multiple regression model

predicting income based on credit balance, years, and size.

11.

Using MINITAB, run the multiple regression analysis using the variables credit balance,

years, and size to predict income. State the equation for this multiple

regression model.

12.

Perform the global test foruUtility (F-Test). Explain your conclusion.

13.

Perform the t-test on each independent variable. Explain your conclusions and

clearly state how you should proceed. In particular, state which independent

variables should we keep and which should be discarded.

14.

Is this multiple regression model better than the linear model that we

generated in parts 1–10? Explain.

.

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