EDUR 8131

Correlation Exercise


Instructions

Present results using the table format provided in the notes entitled "Reporting Statistical Outcomes." Do not include SPSS output or hand-worked calculations; do not present symbolic or written hypotheses; present only results tables and written comments on results. 


1. Hypothesis: There is a relationship between academic self-efficacy and test anxiety. Data to test this hypotheses are provided below.

Table 1: Scores for self-efficacy and test anxiety

Student

Academic Self-efficacy

Test Anxiety

Bob

6

7

Billy

5

9

Bertha

9

7

Brent

8

6

Bryan

5

7

Brenda

9

5

Bernie

7

8

Note. Higher scores indicate high levels of each variable.

 

2. Do income in dollars per year and size of house in square footage correlate with happiness?  

Subject

Size of House

Income

Happiness

a

7125

250,000

5

b

1256

17,500

5

c

1800

43,000

9

d

1750

23,500

6

e

3100

67,500

4

f

3698

87,100

6

g

900

19,700

8

h

5100

117,500

3

j

1952

37,500

7

k

2350

22,000

8

l

2000

24,000

5

m

895

7,000

7

Note. Higher scores on the happiness scale indicate more happiness.

 

3. IGUANA: You want to determine whether there is a relationship between female iguana body weight and the number of eggs they produce. Data from 9 gravid iguanas are:

ID

 Weight

 Eggs

1

 0.90

 33

2

 1.55

 50

3

 1.30

 46

4

 1.00

 33

5

 1.55

 53

6

 1.80

 57

7

 1.50

 44

8

 1.05

 31

9

 1.70

 60 

 

4. DOLL-ECOL: Richard Doll studied the relationship between smoking and lung cancer in many different ways. In one of his earliest investigations, he compiled the information on per capita cigarette consumption in 1930 and lung cancer 20 years later in 1950 for the countries shown below. Is there a relationship between cigarette consumption per capita and mortality as a result of lung cancer?

 

  Cig      

 LungCA Mortality

Country

 Consump

 (per 100,000 p-yrs)

USA

 1300 

20

GrBrit

 1100 

46

Finland

 1100

 35

Switzerland

 510

 25

Canada 

500 

15

Holland 

490

 24

Australia

 480

 18

Denmark

 380

 17

Sweden 

300

 11

Norway

 250

 9

Iceland 

230

 6