MHR 648 Final | Course Paper

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TABLE 16-13

Given below is the monthly time-series data for U.S. retail sales of building materials

over a specific year.

The results of the linear trend, quadratic trend, exponential trend, first-order

autoregressive, second-order autoregressive and third-order autoregressive model are

presented below in which the coded month for the 1st month is 0:

Linear trend model:

Quadratic trend model:

Exponential trend model:

First-order autoregressive:

Second-order autoregressive:

Third-order autoregressive:

Below is the residual plot of the various models:

Referring to Table 16-13, what is the p-value for the t test statistic for testing the

significance of the quadratic term in the quadratic-trend model?

Referring to Table 14-19, what is the p-value of the test statistic when

testing whether Income makes a signiticant contribution to the

model in the presence of LawnSize?

TABLE 14-19

The marketing manager for a nationally franchised lawn service

company would like to study the characteristics that differentiate

home owners who do and do not have a lawn service. A random

sample of 30 home owners located in a suburban area near a large

city was selected; 11 did not have a lawn service (code 0) and 19 had

a lawn service (code 1). Additional information available concerning

these 30 home owners includes family income (Income, in thousands

of dollars) and lawn size (Lawn Size, in thousands of square feet).

The PHStat output is given below:

TABLE 17-3

A financial analyst wanted to examine the relationship between salary (in $1,000) and 4

variables: age (X1 = Age), experience in the field (X2 = Exper), number of degrees (X3 =

Degrees), and number of previous jobs in the field (X4 = Prevjobs). He took a sample of

20 employees and obtained the following Microsoft Excel output:

SUMMARY OUTPUT

Regression Statistics

ANOVA

Referring to Table 17-3, the value of the coefficient of multiple determination, r2

Y.1234,

is ________.

TABLE 13-13

In this era of tough economic conditions, voters increasingly ask the question: “Is the

educational achievement level of students dependent on the amount of money the state

in which they reside spends on education?” The partial computer output below is the

result of using spending per student ($) as the independent variable and composite score

which is the sum of the math, science and reading scores as the dependent variable on

35 states that participated in a study. The table includes only partial results.

Referring to Table 13-13, the critical value at 5% level of significance of the F test on

whether spending per student affects composite score is ________.

You were told that the 1st, 2nd and 3rd quartiles of female students’ weight at a major

university are 95 lbs, 125 lbs, and 138 lbs. What percentage of the students weigh

between 95 and 138 lbs?

TABLE 2-12

The table below contains the opinions of a sample of 200 people broken down by

gender about the latest congressional plan to eliminate anti-trust exemptions for

professional baseball.

Referring to Table 2-12, construct a table of column percentages.

TABLE 5-8

Two different designs on a new line of winter jackets for the coming winter are

available for your manufacturing plants. Your profit (in thousands of dollars) will

depend on the taste of the consumers when winter arrives. The probability of the three

possible different tastes of the consumers and the corresponding profits are presented in

the following table.

Referring to Table 5-8, if you decide to choose Design A for 10% of the production

lines and Design B for the remaining production lines, what is the coefficient of

variation of your investment?