Inferential Statistics

James00712212
questions.docx
Home>Information Systems homework help>Inferential Statistics

QUESTION 4

Calculate the Chi-square test statistic for the goodness of fit with the following table:

The following data represents scores on a police entrance exam.

                                                             Level 1                           Level 2                   Level 3

Observed Values, O                           29                                   201                        169

Expected Values, E                             20.5                               218.8                     159.7

7.516

6.256

9.159

5.514

QUESTION 6

1. A friend brings you data that can be used to establish the independence of two variables. You run an analysis on the data and find a chi square value larger than the tabled value. Your analysis shows that the two variables

are independent

both answers are correct

are not independent

neither answer is correct

QUESTION 7

1. The way in which the data analyzed with chi square differ from those analyzed with ANOVA is that chi square data are

normally distributed

not random samples

not normally distributed

frequency counts

5 points   

QUESTION 8

1. Suppose you wanted to show the degree of relationship between autokinetic movement experienced by subjects when they are alone and the movement experienced by the same subjects when they are being influenced by others. The nonparametric test that will show the degree of relationship is

Spearman rs 

Pearson's product moment

t-test

Chi-square test

QUESTION 11

1. Suppose a researcher found an rs of .89 between amount of blood cholesterol and the severity of the heart attack. Based on an N of 6 and a two-tailed test, the researcher should conclude

significant at the .05 level

not significant

higher blood cholesterol causes more severe heart attacks

p > .05

5 points   

QUESTION 12

1. Identify the following as paired samples or independent samples. Also give the appropriate df.

Thirteen volunteers weighed themselves before and after a two-day fast.

Independent, df=12

Paired, df=12

Paired, df=10 

Paired, df=8

QUESTION 19

1. The scores below are performance scores for six subjects on Trial 1 and Trial 30 of a test of motor skills.  What test should you pick to measure if there is a relationship between trial 1 and trial 30 for the subjects?  What are the results of the statistical test (write up according to the handbook)?

Trial 1      Trial 30

                3             21

                6             25

                2             20

                6             33

                5             23

                8             34

Path: p

Words:0

QUESTION 23

1. A marketing team conducted a survey of 300 people to see if a person’s age affected their brand choice.  People under the age of twenty-five made the following choices: Brand A (25), Brand B (42), Brand C (33).  People over 65 made the following selections: Brand A (20), Brand B (38), Brand C (42).  The group between those ages made these choices: Brand A (44), Brand B(40), Brand C (16).  Form your  hypotheses, run the appropriate test, and provide a conclusion to the marketing team.