Question

Does presentation methodology improve retention for remembered
material? You know that the average number of concepts remembered
from a lecture is 20. You present information using a song to a
group of four participants. Here are their scores for the number of
concepts they remember from a lecture:

20, 21, 18, 29

Please conduct all steps of hypothesis testing and evaluate using a
one tailed test and alpha =.01. You must use all five steps in
hypothesis testing:

1. Restate the question as a research hypothesis and a null
hypothesis about the populations.

2. Determine the characteristics of the comparison
distribution.

3. Determine the cutoff sample score on the comparison distribution
at which the null hypothesis should be rejected.

4. Determine your sample’s score on the comparison
distribution.

5. Decide whether to reject the null hypothesis.

Answer #1

A new school district superintendent was preparing to reallocate
resources for physically impaired students and wanted to know if
the schools in the district differed in the distribution of
physically impaired students. Samples of 20 students from each of
five schools were selected identifying 4 impaired students at
School 1; 1 impaired at School 2; 6 at School 3; 3 at School 4; and
7 at School 5.
Restate the question as a research hypothesis and a null
hypothesis about...

Do students at various universities differ in how sociable they
are? Twenty-five students were randomly selected from each of three
universities in a region and were asked to report on the amount of
time they spent socializing each day with other students. The
result for University X was a mean of 7 hours and an estimated
population variance of 3 hours; for University Y, M=6, S2=2; and
for University Z, M=8, S2=1.5. What should you conclude? Use the
0.05 level....

For each of the single sample t-tests below (problem 1-3),
please include:
1) The null and alternative hypotheses (can be written in notation
or as a sentence)
2) Calculate (show all work):
a) The estimated population variance
b) The variance of the distribution of means
c) The standard deviation of the distribution of means
3) Degrees of freedom
4) The cutoff sample score on the comparison distribution at which
the null hypothesis
should be rejected (cutoff scores)
5) The sample’s...

a researcher wanted to know if type of adult attachment
affected how well people cope with being forced to stay at home
during the COVID-19 pandemic. Here are her results.
expected effect size is medium
Table 1
ANOVA Summary Table
Source SS df MS
F
Type of Adult
Attachment 270 3 90 4.50*
Within 1200 60 20
Total 1470 63
* P < .05
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _...

A social psychologist studying mass communication randomly
assigned 82 volunteers to one of two experimental groups. Fifty
seven were instructed to get their news for a month only from
television, and 25 were instructed to get their news for a month
only from the Internet. After the month was up, all participants
were tested on their knowledge of several political issues. The
researcher simply predicted that there is some kind of difference.
These were the results of the study. TV...

Problem: A company is claiming that their new product BrawndoTM
is “what the plants crave”. As the sole researcher left in the
country, you are skeptical and worried that BrawndoTM may have too
many electrolytes for plants and actually hurts crops. You test
whether BrawndoTM hurts crop yield. Since this is such an important
decision, you want to be conservative and use a significance test
of p=.01 before making any conclusions. You know that using the
traditional water method led...

Situation:
A survey was conducted to determine
whether a proposed federal law should be passed to over haul the
health care system in U.S. The following data was collected
recording the number of people favoring the law based on their age
group. It is believed that the distribution of the people favoring
passing the law varies based on the age of the survey
participants.
Action:
Using the chi-square goodness of fit
test and either Excel or Minitab, determine whether age...

Question 28 options:
You want to know what is the optimal amount of sleep to maximize
cognitive performance. You conduct a study in which 4 participants
are randomly assigned to each of 4 conditions. The condition differ
only in how many hours of sleep they receive per night. You install
an app on the participants’ phones which wakes them up every
morning after the prescribed number of hours of sleep. After two
weeks, you give all of the participants a...

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