Paper details
Assignment Instructions
Provide a clear and concise answer to each question below making sure to address each part of the question (if the problem
requires you to perform calculations by hand, you must show work). Then, submit the file (appropriately named) with your
answers through the assignment link in this course space. Do not attach SPSS data and output files, copy and paste them into
this assignment.
1. A psychologist is examining the educational advantages of a preschool program and suspects that there will be significant
differences in achievement based on preschool attendance. Twentyfour
randomly selected 4th grade children are used in the
study. Half attend a preschool program and half do not. Each child’s achievement score is given below. Make sure to use the
appropriate ttest
for this analysis!
Preschool: 8, 6, 8, 9, 7, 9, 6, 9, 8, 9, 7, 8
No Preschool: 6, 5, 7, 6, 8, 5, 7, 5, 6, 7, 5, 6
a. What is the null and alternative hypothesis (in symbols) for this ttest?
(1 point)
b. Use SPSS to calculate the appropriate ttest
statistic, be sure to include your SPSS output for the ttest
and descriptive
statistics below. Is the ttest
significant? (2 points)
c. State your conclusion in APA format. (1 points)
2. A manager would like to know if the performance of sales representatives significantly improves over the first 6 months of
employment. For 5 new sales representatives, the number of sales in the first month is recorded and the number of sales in the
sixth month is recorded. The sales numbers at the 1st and 6th month are given below. Make sure to use the appropriate ttest
for this analysis!
Person 1st Month 6th Month
1 150 145
2 190 220
3 80 140
4 155 155
5 87 94
d. What is the null and alternative hypothesis (in symbols) for this ttest?
(1 point)
e. What is the critical value for this ttest
(α = .05)? (1 point)
f. Calculate the appropriate ttest
statistic (by hand) and determine if it is significant (α = .05) (2 points
