Question
In: Statistics and Probability
) In a study of the effects of caffeine on alertness, 32 subjects were randomly assigned...
) In a study of the effects of caffeine on alertness, 32 subjects were randomly assigned to four groups. These groups were C1: wait-list control (no treatment), C2: placebo control, E1: experimental group 1 (mild caffeine treatment) and E2: experimental groups 2 (high caffeine treatment). Several subjects were not able to complete the study, reducing the group n’s to 7, 5, 6, and 3, respectively. The dependent variable scores were performance scores on a visual-motor task requiring alertness. The results are as follows:
| C1 | C2 | E1 | E2 |
| 18 | 20 | 25 | 32 |
| 16 | 18 | 22 | 26 |
| 15 | 15 | 19 | 20 |
| 14 | 12 | 17 | |
| 13 | 10 | 14 | |
| 12 | 11 | ||
| 10 |
Do the results indicate a significant difference between treatment groups? State the null hypothesis, Fcritical, η2, and use Scheffe’s test to determine which treatment conditions differ in the event of rejecting the null hypothesis. Conclude with a summary appropriate for publication.
Solutions
orchestra answered 10 months agoRelated Solutions
1) In a study of the effects of caffeine on alertness, 32 subjects were randomly assigned...
1) In a study of the effects of caffeine on alertness, 32
subjects were randomly assigned to four groups. These groups were
C1: wait-list control (no treatment), C2: placebo control, E1:
experimental group 1 (mild caffeine treatment) and E2: experimental
groups 2 (high caffeine treatment). Several subjects were not able
to complete the study, reducing the group n’s to 7, 5, 6, and 3,
respectively. The dependent variable scores were performance scores
on a visual-motor task requiring alertness. The results...
12 subjects in a study were randomly assigned into two equally sized groups. One group was...
12 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...
In a study, 272 moderately obese subjects were randomly assigned to one of three diets: low-fat,...
In a study, 272 moderately obese subjects were randomly
assigned to one of three diets: low-fat, restricted-calorie;
Mediterranean, restricted-calorie; or low-carbohydrate,
nonrestricted-calorie. The prediction was that subjects on a
low-carbohydrate diet would lose weight, on the average. After
two years, the mean weight loss was 5.5 kg for the 109 subjects in
the low-carbohydrate group with a standard deviation of 7.0 kg.
The technology output below shows results of a significance test
for testing
Upper H 0 : mu equals...
In a study, 272 moderately obese subjects were randomly assigned to one of three diets: low-fat,...
In a study, 272 moderately obese subjects were randomly
assigned to one of three diets: low-fat, restricted-calorie;
Mediterranean, restricted-calorie; or low-carbohydrate,
nonrestricted-calorie. The prediction was that subjects on a
low-carbohydrate diet would lose weight, on the average. After
two years, the mean weight loss was 5.5 kg for the 109 subjects in
the low-carbohydrate group with a standard deviation of 7.0 kg.
The technology output below shows results of a significance test
for testing
Upper H 0 : mu equals...
An experiment on memory was performed, in which 16 subjects were randomly assigned to one of...
An experiment on memory was performed, in which 16 subjects were
randomly assigned to one of two groups, called "Sentences" or
"Intentional". Each subject was given a list of 50 words. Subjects
in the "Sentences" group were told to form multiple sentences, each
using at least two words from the list, and to keep forming
sentences until all the words were used at least once. Subjects in
the "Intentional" group were told to spend five minutes memorizing
as many of...
An experiment on memory was performed, in which 16 subjects were randomly assigned to one of...
An experiment on memory was performed, in which 16 subjects were
randomly assigned to one of two groups, called "Sentences" or
"Intentional". Each subject was given a list of 50 words. Subjects
in the "Sentences" group were told to form multiple sentences, each
using at least two words from the list, and to keep forming
sentences until all the words were used at least once. Subjects in
the "Intentional" group were told to spend five minutes memorizing
as many of...
An experiment on memory was performed, in which 16 subjects were randomly assigned to one of...
An experiment on memory was performed, in which 16 subjects were
randomly assigned to one of two groups, called "Sentences" or
"Intentional". Each subject was given a list of 50 words. Subjects
in the "Sentences" group were told to form multiple sentences, each
using at least two words from the list, and to keep forming
sentences until all the words were used at least once. Subjects in
the "Intentional" group were told to spend five minutes memorizing
as many of...
An experiment on memory was performed, in which 16 subjects were randomly assigned to one of...
An experiment on memory was performed, in which 16 subjects were
randomly assigned to one of two groups, called "Sentences" or
"Intentional". Each subject was given a list of 50 words. Subjects
in the "Sentences" group were told to form multiple sentences, each
using at least two words from the list, and to keep forming
sentences until all the words were used at least once. Subjects in
the "Intentional" group were told to spend five minutes memorizing
as many of...
An experiment on memory was performed, in which 16 subjects were randomly assigned to one of...
An experiment on memory was performed, in which 16 subjects were
randomly assigned to one of two groups, called "Sentences" or
"Intentional". Each subject was given a list of 50 words. Subjects
in the "Sentences" group were told to form multiple sentences, each
using at least two words from the list, and to keep forming
sentences until all the words were used at least once. Subjects in
the "Intentional" group were told to spend five minutes memorizing
as many of...
An experiment on memory was performed, in which 16 subjects were randomly assigned to one of...
An experiment on memory was performed, in which 16 subjects were
randomly assigned to one of two groups, called "Sentences" or
"Intentional". Each subject was given a list of 50 words. Subjects
in the "Sentences" group were told to form multiple sentences, each
using at least two words from the list, and to keep forming
sentences until all the words were used at least once. Subjects in
the "Intentional" group were told to spend five minutes memorizing
as many of...
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