Exam code: 7182
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Psychologists conduct probability and significance testing to see if their results show real differences or correlations or if they are due to:
a) chance
b) the independent variable
c) controlled conditions
a.
Psychologists conduct probability and significance testing to see if their results show real differences or correlations, or if they are due to chance.
How is the 5% probability level expressed?
a) p > 0.05
b) p < 0.05
c) p < 0.5
b.
The 5% probability level is expressed as p < 0.05.
Which one of the following questions is not used to determine the critical value?
a) What is the N value?
b) What is the independent variable?
c) Is the test one-tailed or two-tailed?
d) What is the level of significance?
b.
'What is the independent variable?' is not used to determine the critical value.
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Psychologists conduct probability and significance testing to see if their results show real differences or correlations or if they are due to:
a) chance
b) the independent variable
c) controlled conditions
a.
Psychologists conduct probability and significance testing to see if their results show real differences or correlations, or if they are due to chance.
How is the 5% probability level expressed?
a) p > 0.05
b) p < 0.05
c) p < 0.5
b.
The 5% probability level is expressed as p < 0.05.
Which one of the following questions is not used to determine the critical value?
a) What is the N value?
b) What is the independent variable?
c) Is the test one-tailed or two-tailed?
d) What is the level of significance?
b.
'What is the independent variable?' is not used to determine the critical value.
What is a Type I Error?
A Type I Error occurs when the null hypothesis is rejected when it should have been accepted.
The researcher claims that the results are significant when in fact they are not (also known as a false positive).
A Type II Error occurs when the hypothesis is when it should have been .
A Type II Error occurs when the null hypothesis is accepted when it should have been rejected.
The researcher claims that the results are not significant when in fact they are (also known as a false negative).
The Sign Test is used when the data collected (dependent variable) uses which level of measurement?
a) Nominal
b) Ordinal
c) Interval
a.
The Sign Test is used when the dependent variable uses nominal data.
Which one of the following is not a criteria for when to use the Sign Test?
a) Testing a correlation
b) Nominal data
c) Repeated measures
d) Testing a difference
a.
Testing a correlation is not a criteria for when to use the Sign Test.
The first step in calculating the Sign Test is to the score in one condition from the score in the other condition.
The first step in calculating the Sign Test is to subtract the score in one condition from the score in the other condition.
Step 3 of the Sign Test is to count the number of:
a) scores in total
b) tied scores
c) + and - signs
c.
Step 3 of the Sign Test is to count the number of + and - signs.
True or False?
A Sign Test is used when a study uses independent groups (unrelated design).
False.
A Sign Test is used when a study uses repeated measures (related design).
Which three factors determine the choice of statistical test?
The three factors that determine the choice of statistical test are:
if it is a test of difference or correlation
the design of the test (related/unrelated)
the level of measurement/type of data (nominal/ordinal/interval)
A test of correlation using ordinal data would be tested using the:
a) Mann Whitney test
b) Spearman's rho test
c) Pearson's r test
d) Wilcoxon test
b.
A test of correlation using ordinal data would be tested using the Spearman's rho test.
Which three factors determine the use of a Chi-squared test?
A Chi-squared test is used when:
Testing for a difference
Using nominal data
Using an unrelated design
True or False?
The related t-test is a test of correlation using interval data.
False.
The related t-test is a test of difference using interval data (with a related design).
What is the difference between choosing a Mann-Whitney test and an unrelated t-test?
A Mann-Whitney test is used when the data is ordinal, and an unrelated t-test is used with interval data.