Question

Scientists claim eating chocolate can improve memory. So to test this theory 10 subjects were given a memory test in which they had to remember 25 items with and without having eaten chocolate. The results were as follows:

Subject | A | B | C | D | E | F | G | H | I | J |

Without Chocolate | 18 | 16 | 21 | 23 | 14 | 15 | 14 | 19 | 20 | 22 |

With Chocolate | 20 | 17 | 23 | 21 | 16 | 18 | 13 | 23 | 22 | 20 |

What is the p-value? Round answer to four decimal places (i.e. 0.1234)? Answer

At a level of significance (alpha) of 0.05, what is your decision?

reject the null hypothesis

accept the null hypothesis

fail to reject the null hypothesis

Answer #1

**p value =0.0643**

since p value > 0.05

**fail to reject the null hypothesis**

Does the use of examples improve memory for the concepts being
taught? Joe Researcher tested this possibility by teaching 10
subjects 20 concepts each. For each subject, examples were provided
to help explain 10 of the new concepts, no examples were provided
for the other 10. Joe then tested his subjects memory for the
concepts and recorded how many concepts, out of 10, that the
subject could remember. Here are his data: Test the above
hypothesis at ( alpha=0.05) level?...

Loftus and Palmer studied the relationship between implicit
recall cues and memory. They manipulated the wording in questioning
subjects about an accident they had viewed on film. Students were
shown a multi-car accident and then given a questionnaire asking
them to recall details of the collision. One group of subjects were
asked to estimate how fast the cars were travelling when they "hit"
each other, while the other group was asked to estimate how fast
the cars were travelling when...

The following data are for three groups of subjects who are
exposed to three different methods of exercise programs. The
dependent variable is the number of sit-up. Test the appropriate
hypothesis using alpha = .05.
Method A : 20, 18, 14, 16, 13, 19, 12 Method B: 19,
12, 13, 17, 15, 20, 14 Method C: 24, 35, 26, 29, 31,
25, 38
-. State the null hypothesis.
-. Report the result in a statistical term and interpret...

A study was conducted to see if students’ writing skills
continue to improve as the academic year progresses. English 101
students were asked to write essays throughout the year in
September, December, March and June. The scores were compared to
see if there is any improvement in this one-year course. Was there
a significant improvement?
The appropriate test for this problem is:
one-way ANOVA
repeated measurements
Student
September
December
March
June
1
17
23
21
24
2
25
21
21...

10 subjects in a study were randomly assigned into two
equally sized groups. One group was shown a short video on how to
fold paper cranes. The other group was given an instruction booklet
on how to do so. They were then asked to make paper cranes for the
next hour. The number of paper cranes each subject made was
recorded and is listed in the table below. The researchers are
interested in whether there was a difference in the...

12. In a study of memory recall, 5 people were given 10 minutes
to memorize a list of 20 words. Each was asked to list as many of
the words as he or she could remember both 1 hour and 24 hours
later. The result is shown in the following table. Assume we want
to use a 0.05 significance level in your analysis. The research
question is: Do students recall significantly more words after 1
hour than after 24 hours...

Based on previous research and sound theoretical considerations
an experimental psychologist believes that memory of pictures is
superior to memory for words. To test this hypothesis the
psychologist performs an experiment in which students from an
introductory psychology class are used as subjects. Eight randomly
selected students view 30 slides with random nouns printed on them
and another group of eight randomly selected students
views 30 slides with actual pictures of the objects represented by
the same nouns. Each slide...

Test the claim that the mean gas MPG (city) is equal for all
three car sizes. This requires the use of one-way ANOVA (single
factor) to test for equality of three or more means (12.2).
Calculate the null and alternate hypothesis, test statistic,
critical value, p-value, and state the conclusion.
Size
Class
Gas MPG - City
Driving
Small
25
Small
27
Small
25
Small
25
Small
29
Midsize
19
Small
22
Midsize
20
Midsize
21
Midsize
21
Small
20
Midsize...

The Chart Listed Is The Only Info You Need
(Anderson et al. 2015) A sample of 8 seafood restaurants, 8
Italian restaurants and 8 Steakhouses is selected. The meal price
(the average amount paid per person for dinner and drinks, minus
the tip) is recorded for each restaurant. The data is provided in
the spreadsheet "GrandStand.xlsx", which is available in the Week6
folder.
Use level of significance 0.05 to test whether there is a
significant difference among the mean meal...

A fitness course claims that it can improve an individual's
physical ability. To test the effect of a physical fitness course
on one's physical ability, the number of sit-ups that a person
could do in one minute, both before and after the course, was
recorded. Ten individuals are randomly selected to participate in
the course. The results are displayed in the following table. Can
it be concluded, from the data, that participation in the physical
fitness course resulted in significant...

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