Assignment #4
Due: December 6, 2023
This is due prior to the beginning of live session on the due date. Use this document to
answer questions. Include the questions with answers and highlight answers. Copy and
paste relevant software output into this document in your answer. Software is only
required to be used where indicated. Please submit as a word document or pdf.
Please identify any students you worked with on this assignment.
1.
[Week 10] A developmental psychologist placed children in a social situation in which
they were either rewarded or punished (Factor A: consequence) by a parent, sibling, or
stranger (Factor B: type of adult). Following this social situation, children were placed
back in the same social situation, and the time it took them (in seconds) to engage in the
punished or rewarded behavior was recorded. The data are given in the behavior tab of
assignment4data.xlsx.
a.
Write the null hypotheses in words
b.
Write the alternative hypotheses in words
c.
Use software to obtain the test statistics and p-values. Report the two-way
ANOVA table.
d.
Make a decision about each null hypotheses using the p-value approach.
e.
Write conclusion in APA style.
f.
Use software create an interaction plot. Give a brief interpretation in context of
the variables.
2.
[Week 11] A professor notices that more and more students are using their laptop
computers in class to take notes. He wonders if this may improve academic success. To
test this, the professor records the number of times each student uses his or her laptop
during a class for one semester (Laptop) and the final grade in the class out of 100
points (Grade). The data are in the laptop tab of assignment4data.xlsx. The professor
wants to conduct a hypothesis test to test whether or not there is a significant
relationship between Laptop and Grade at the .05 level of significance.
a.
Using software, create a scatterplot and interpret. Does it seem to suggest there
is a relationship?
b.
Write the null hypothesis and alternative hypothesis in symbols
c.
Using software, obtain the correlation coefficient and report the output for the
hypothesis test
d.
Make a decision about the null hypotheses using the p-value approach
e.
Write conclusion in APA style
f.
If appropriate, calculate the effect size. If not, state why.
3.
[Week 12] A psychologist believed that as children get older, they engage in more
“inactive activities” such as playing computer games, watching TV and surfing the
internet. She collected data from 10 children. She recorded the age of each child and the
amount of activity (in hours) the child engaged in per week. The data are in the activity
tab of assignment4data.xlsx.
a.
Using software, obtain a scatterplot of the data. Discuss the relationship between
age and activity based on the scatterplot.
b.
Using software, obtain the simple linear regression linear regression line
predicting activity from age.
c.
Interpret the intercept and slope of the regression line
