Stats Review - PowerPoint PPT Presentation

PPT – Stats Review PowerPoint presentation | free to download - id: 79e828-ZTY3Y

The Adobe Flash plugin is needed to view this content

Get the plugin now

View by Category
Title:

Stats Review

Description:

Stats Review Identify the appropriate statistic A researcher randomly assigns five individuals to receive a new experimental procedure and five to a control condition. – PowerPoint PPT presentation

Number of Views:13
Avg rating:3.0/5.0
Slides: 23
Provided by: LF8
Category:
Tags:
Transcript and Presenter's Notes

Title: Stats Review

1
Stats Review
2
Identify the appropriate statistic
• A researcher randomly assigns five individuals to
receive a new experimental procedure and five to
a control condition. At the end of the study, all
10 are measured. Scores for those in the
experimental group were 7, 6, 9, 7, and 6. Scores
for those in the control group were 5, 2, 4, 3,
and 6.

3
Identify the appropriate statistic
• A researcher randomly assigns five individuals to
receive a new experimental procedure and five to
a control condition. At the end of the study, all
10 are measured. Scores for those in the
experimental group were 7, 6, 9, 7, and 6. Scores
for those in the control group were 5, 2, 4, 3,
and 6.
• Independent measures t-test

4
Identify the appropriate statistic
• An experiment compares the effects of four
treatments, giving each treatment to 20
participants and then assessing their performance
on a standard measure.

5
Identify the appropriate statistic
• An experiment compares the effects of four
treatments, giving each treatment to 20
participants and then assessing their performance
on a standard measure.
• One way ANOVA

6
Identify the appropriate statistic
• A medical researcher has heard anecdotal evidence
that certain anti-depressive drugs can have the
positive side-effect of lowering neurological
pain in those individuals with chronic,
neurological back pain, when administered in
doses lower than those prescribed for depression.
The researcher identifies 3 well-known,
anti-depressive drugs which might have this
positive side-effect, and labels them Drug A,
Drug B and Drug C. The researcher then recruits a
group of 60 individuals with a similar level of
back pain and randomly assigns them to one of
three groups - Drug A, Drug B or Drug C treatment
groups - and prescribes the relevant drug for a 4
week period. At the end of the 4 week period, the
researcher asks the participants to rate their
back pain on a scale of 1 to 10, with 10
indicating the greatest level of pain. The
researcher wishes to compare the levels of pain
experienced by the different groups at the end of
the drug treatment period.

7
Identify the appropriate statistic
• A medical researcher has heard anecdotal evidence
that certain anti-depressive drugs can have the
positive side-effect of lowering neurological
pain in those individuals with chronic,
neurological back pain, when administered in
doses lower than those prescribed for depression.
The researcher identifies 3 well-known,
anti-depressive drugs which might have this
positive side-effect, and labels them Drug A,
Drug B and Drug C. The researcher then recruits a
group of 60 individuals with a similar level of
back pain and randomly assigns them to one of
three groups - Drug A, Drug B or Drug C treatment
groups - and prescribes the relevant drug for a 4
week period. At the end of the 4 week period, the
researcher asks the participants to rate their
back pain on a scale of 1 to 10, with 10
indicating the greatest level of pain. The
researcher wishes to compare the levels of pain
experienced by the different groups at the end of
the drug treatment period.
• Kruskal-Wallis test

8
Identify the appropriate statistic
• A researcher studied the relation between
psychotherapists degree of empathy and their
patients satisfaction with therapy

9
Identify the appropriate statistic
• A researcher studied the relation between
psychotherapists degree of empathy and their
patients satisfaction with therapy
• Correlation

10
Identify the appropriate statistic
• A researcher wants to examine whether music (no
music", "classical music" and "dance music) has
an effect on the perceived psychological effort
required to perform an exercise session. The
researcher recruited 12 runners who each ran
three times on a treadmill for 30 minutes. For
consistency, the treadmill speed was the same for
all three runs. In a random order, each subject
ran (a) listening to no music at all (b)
listening to classical music and (c) listening
to dance music. At the end of each run, subjects
were asked to record how hard the running session
felt on a scale of 1 to 10, with 1 being easy and
10 extremely hard

11
Identify the appropriate statistic
• A researcher wants to examine whether music (no
music", "classical music" and "dance music) has
an effect on the perceived psychological effort
required to perform an exercise session. The
researcher recruited 12 runners who each ran
three times on a treadmill for 30 minutes. For
consistency, the treadmill speed was the same for
all three runs. In a random order, each subject
ran (a) listening to no music at all (b)
listening to classical music and (c) listening
to dance music. At the end of each run, subjects
were asked to record how hard the running session
felt on a scale of 1 to 10, with 1 being easy and
10 extremely hard
• Friedman test

12
Identify the appropriate statistic
• A director of a small psychotherapy clinic is
wondering whether there is any difference in the
use of the clinic during different seasons o fthe
year. Last year, there were 28 new clients in the
winter, 33 in the spring, 16 in the summer, and
52 in the fall. On the basis of last years data,
should the director conclude that seasons makes a
difference?

13
Identify the appropriate statistic
• A director of a small psychotherapy clinic is
wondering whether there is any difference in the
use of the clinic during different seasons o fthe
year. Last year, there were 28 new clients in the
winter, 33 in the spring, 16 in the summer, and
52 in the fall. On the basis of last years data,
should the director conclude that seasons makes a
difference?
• Chi-square goodness of fit

14
Identify the appropriate statistic
• A pain researcher is interested in finding
methods to reduce lower back pain in individuals
without having to use drugs. The researcher
thinks that having acupuncture in the lower back
might reduce back pain. To investigate this, the
researcher recruits 25 participants to their
study. At the beginning of the study, the
researcher asks the participants to rate their
back pain on a scale of 1 to 10, with 10
indicating the greatest level of pain. After 4
weeks of twice weekly acupuncture the
participants are asked again to indicate their
level of back pain on a scale of 1 to 10, with 10
indicating the greatest level of pain. The
researcher wishes to understand whether the
participants' pain levels changed after they had
undergone the acupuncture

15
Identify the appropriate statistic
• A pain researcher is interested in finding
methods to reduce lower back pain in individuals
without having to use drugs. The researcher
thinks that having acupuncture in the lower back
might reduce back pain. To investigate this, the
researcher recruits 25 participants to their
study. At the beginning of the study, the
researcher asks the participants to rate their
back pain on a scale of 1 to 10, with 10
indicating the greatest level of pain. After 4
weeks of twice weekly acupuncture the
participants are asked again to indicate their
level of back pain on a scale of 1 to 10, with 10
indicating the greatest level of pain. The
researcher wishes to understand whether the
participants' pain levels changed after they had
undergone the acupuncture
• Wilcoxon signed-rank test

16
Identify the appropriate statistic
• Researchers mailed a survey to a random sample of
physicians. Half were offered 1 if they would
return the questionnaire this was the
experimental group) the other half served as a
control group. The point of the study was to see
if even a small incentive would increase the
return rate for physicians surveys

17
Identify the appropriate statistic
• Researchers mailed a survey to a random sample of
physicians. Half were offered 1 if they would
return the questionnaire this was the
experimental group) the other half served as a
control group. The point of the study was to see
if even a small incentive would increase the
return rate for physicians surveys
• Chi-square tests of independence

18
Identify the appropriate statistic
• Van Prooijen and colleagues (2004) carried out a
series of studies focusing on the effect of
belongingness and being able to voice ones
opinion about a decision on a persons
satisfaction with the decision making process.
The researchers measured procedural satisfaction
by asking the students to rate how satisfied they
were with the way they were treated by the other
people on their team.

19
Identify the appropriate statistic
• Van Prooijen and colleagues (2004) carried out a
series of studies focusing on the effect of
belongingness and being able to voice ones
opinion about a decision on a persons
satisfaction with the decision making process.
The researchers measured procedural satisfaction
by asking the students to rate how satisfied they
were with the way they were treated by the other
people on their team.
• Factorial ANOVA

20
Identify the appropriate statistic
• The effectiveness of advertising for two rival
products (Brand X and Y) was carried out at a
local shopping centre. Participants were shown
ads for two brands of coffee, which they then
rated on the overall likelihood of them buying
the product (out of 10, with 10 being definitely
going to buy the product). Half of the
participants gave ratings for one of the
products, the other half gave ratings for the
other product

21
Identify the appropriate statistic
• The effectiveness of advertising for two rival
products (Brand X and Y) was carried out at a
local shopping centre. Participants were shown
ads for two brands of coffee, which they then
rated on the overall likelihood of them buying
the product (out of 10, with 10 being definitely
going to buy the product). Half of the
participants gave ratings for one of the
products, the other half gave ratings for the
other product
• Mann-Whitney test

22
Some humour