1. McAllister et al. (2012) compared varsity football and hockey players (n = 8)

Question

1. McAllister et al. (2012) compared varsity football and hockey players (n = 8) with varsity athletes from noncontact sports (n = 8) to determine whether exposure to head impacts during one season have an effect on cognitive performance. The t-value calculated was 1.98.

A. State the null and the alternative hypothesis (using words and symbols)

B. Set the decision criteria

C. Use the t-value provided (you don’t need to do calculations).

D. Make the decision (fail to reject or reject the null hypothesis at either or both the .01 or .05 alpha level)

Explanation / Answer

PART A.
AT 0.01 LOS
Set Up Hypothesis
Null, Ho: u1 < u2
Alternate, one season have an effect on cognitive performance. - H1: u1 > u2
to =1.98
| to | =1.98
Critical Value
The Value of |t | with Min (n1-1, n2-1) i.e 5 d.f is 3.365
We got |to| = 1.98 & | t | = 3.365
Make Decision
Hence Value of |to | < | t | and Here we Do not Reject Ho
P-Value:Right Tail -Ha : ( P > 1.98 ) = 0.05229
Hence Value of P0.01 < 0.05229,Here We Do not Reject Ho

PART B.
Set Up Hypothesis
Null, Ho: u1 < u2
Alternate, one season have an effect on cognitive performance. - H1: u1 > u2
to =1.98
| to | =1.98
Critical Value
The Value of |t | with Min (n1-1, n2-1) i.e 5 d.f is 2.015
We got |to| = 1.98 & | t | = 2.015
Make Decision
Hence Value of |to | < | t | and Here we Do not Reject Ho
P-Value:Right Tail -Ha : ( P > 1.98 ) = 0.05229
Hence Value of P0.05 < 0.05229,Here We Do not Reject Ho

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