# Thread: help with Stats hypothesis testing question

1. ## help with Stats hypothesis testing question

Hey guys, I don't have access to spss but I was wondering if I could get help on this question, its review for my exam coming up in a couple days. Thanks!

The following are data of short-term memory span for a sample of children in a special education class, following a training program that is expected to improve memory. The numbers indicate how many items a participant recalled in a memory task.

5.00
9.00
4.00
6.00
8.00
7.00
3.00
4.00
8.00
7.00
5.00
6.00
6.00
8.00
4.00
4.00
7.00
9.00
3.00
4.00
5.00
6.00
8.00
4.00
3.00
5.00
5.00
7.00
10.00
4.00
6.00
6.00
20.00
1. The average memory span for all children this age is 5.5 items with a standard deviation of 1.50 items. What can the researcher conclude about the memory performance of this sample? (Use α = .05, two-tailed test)

2. Conduct the hypothesis test again, this time removing the outlying score of 20. What conclusion is reached now about the children who received the training program?

2. ## Re: help with Stats hypothesis testing question

20 included:

$P\left[\left.\mu >\mu _0\right|\sigma ,\nu \right]=0.156>0.025$ special class to improve short-term memory of kids = no good even with the super high IQ kid included!

20 outlier exclude:

$P\left[\left.\mu >\mu _0\right|\sigma ,\nu \right]=0.30592>0.025$ excluding the super-smart kid makes the course worthless!