Question

QUESTION 3 A teacher sees students straggling into her class at highly diverse times. She secretly records when each person comes into her class. Everyone in the class at the bell gets a score of zero. Then, as each late person comes in, the number of seconds after the bell that the person arrives is recorded. Number of seconds late, then, is each person's individual score. The scores ranged from 0 to 600 (for people who were 10 minutes late). The teacher also has each person's exam average over the semester. She wants some estimate of the degree of relationship between a person's lateness and his or her exam scores in her class. Which statistic should she use? O Z-test O One Sample t-test Independent groups t-test Dependent groups t-test One Factor ANOVA Two factor ANOVA t-test for r0 O Chi-square test 0 Phi Coefficient 0 Camers Phỉ O Point Biserial Eta-squared Or-squared or 3 points Save Answer

Answer 1

Use t test for r>0.

r is the sample correlation. Correlation gives the degree of association between 2 variables.

t test is used to determine if correlation is significantly different from 0.

So if r is significantly different from 0, it means there is association between the variables.