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