Question

5) A researcher test the number of pages 10 individual before and after an "reading speed" experimental procedure. Prior to the experiment the research had no a prior hypothesis of the direction of an effect. The results are as follow:

Before	After
10.4	10.8
12.6	12.1
11.2	12.1
10.9	11.4
14.3	13.9
13.2	13.5
9.7	10.9
11.5	11.5
10.8	10.4
13.1	12.5

a) What is t_obs?

b) What is positive t_crit for an α=0.05?

c) Do you reject the null?

Answer 1

NULL HYPOTHESIS H0:

ALTERNATIVE HYPOTHESIS Ha:

a]

(TWO TAILED TEST)

b] degrees of freedom= n-1=10-1=9

t critical= 2.26

Since t critical is greater than tobs therefore NOT SIGNIFICANT

DECISION: DO NOT REJECT H0.