Question

1. The math achievements scores of two groups, each with 20 students, were compared. The degrees of freedom for the t-test would be:

   1. 40

   2. 18

   3. 42

   4. 38

2. As part of a study of the effect of zombie shows on the walking style of adolescents, researchers measured the gait of 100 subjects (using the ZombieTron 6000) before and after watching a 6 hour Walking Dead marathon. They wanted to see if the adolescents incorporated more “zombie” elements into their gait after this exposure. What would be the appropriate statistical test: Simple ANOVA, T-test, Matched pairs t-test or Correlation?

Answer 1

The math achievements scores of two groups, each with 20 students, were compared. The degrees of freedom for the t-test would be:

Answer: 38

Explanation:

For the given scenario, we have

n₁ = 20

n₂ = 20

df = n₁ + n₂ - 2

df = 20 + 20 - 2

df = 38

· As part of a study of the effect of zombie shows on the walking style of adolescents, researchers measured the gait of 100 subjects (using the ZombieTron 6000) before and after watching a 6 hour Walking Dead marathon. They wanted to see if the adolescents incorporated more “zombie” elements into their gait after this exposure. What would be the appropriate statistical test: Simple ANOVA, T-test, Matched pairs t-test or Correlation?

Answer:

Matched pairs t-test

Explanation:

For the given hypothesis test scenario, two samples are dependent samples or matched paired samples. There is a one to one relationship between the two samples. So, we need to use the matched pairs t-test for the mean difference.