# studie help

All the students begin their courses with an introductory course. The researcher wonders if the

proportion of students who passed the introductory course is equal to the proportion who graduated.

The table below shows the proportions.

Not graduated

Graduate

Not passed introductory

97

81

Passed introductory

64

158

Total

161

239

What is the p-value associated with the test statistic for two-sided test?

Answer:

Course duration was predicted through a multiple regression test using procrastination,

IQ, gender, achievement motivation and failure anxiety. See sum of squares output below.

Sum of Squares

df

Mean Square

Regression

8275.689

5

1655.138

Residual

50173.825

140

358.384

Total

58449.514

145

What is the multiple correlation value?

Answer:

A one-way variation analysis tested if mean scores on the Deadline Avoidance Scale were

similar for the three course completion status groups (graduated, dropped out before the

end of the first year, or dropped out after the first year). See the table below.

Sum of Squares

Between Groups

2.727

Within Groups

114.637

Total

117.364

What is the value of the F test statistic?

Answer:

The correlation between the procrastination questionnaire score and course duration is

0.375. What is the proportion of variance is explained by the variable ‘procrastination’ in a

bivariate regression with course duration as the dependent variable?

Answer:

The researcher wonders if study success is associated with faculty (here, just Law and

Social Sciences). These are all nominal variables. On the basis of the table below the

researcher tests is whether the variables are associated.

Graduated

Dropped out before first year

Drop

Law

51

15

37

Social Sciences

206

39

80

What is the value of the test statistic?

Answer:

To test whether or not passing the first year depends on the student’s procrastination

score, a logistic regression analysis was conducted. The test also controlled for gender

(female = 0, male = 1). See the results in the table below.

B

S.E.

df

Sig.

Procrastination

0.397

0.192

1

0.03

Gender

0.672

0.301

1

0.02

Intercept

-2.472

0.583

1

0.00

Mean procrastination was 2.7479, with a standard deviation of 0.77183. Based on the

logistic regression model, what is the probability that a male student who has a

procrastination score one standard deviation above the mean passes the first year?

Answer:

The researcher wants to test whether mean procrastinating score (in a subset of students),

is higher for those that graduated compared to those that did not graduate. Using a table,

what is the upper limit of the probability threshold for the relevant test statistic (p

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