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Stats Review

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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

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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
  • http//www.youtube.com/watch?vJS9GmU5hr5w
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