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Descriptive and inferential statistics quiz
Descriptive and inferential statistics quiz
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Descriptive and inferential statistics quiz
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1
When would you NOT use the mean as a measure of central tendency?
When you had extreme scores
When you had a skewed distribution
When you wanted to find the average
When you had a normal distribution
2
Which parametric test would you use to test the correlation between 2 continuous variables?
Spearman's rho correlation
Related t-test
Binomial Sign test
Pearson correlation
3
Would a probability level of p<0.05 be significant?
No
Probably not
Yes
Possibly maybe
4
If comparing 2 groups and the distribution of outcome data is normal, which test should I use?
Anova
Ancova
Correlation
t-test
5
The power of a test can be increased by...
using a larger sample size
using a smaller sample size
choosing a smaller value for alpha
none are correct
6
The confidence interval that is used the most is:
90%
100%
80%
95%
7
Which non-parametric statistical test would you use with a correlation?
Spearman's rho
Sign test (Binomial)
Wilcoxon signed ranks test
Mann-Whitney U test
8
What type of graph is this?
Scatergraph
Pie chart
Frequency polygon
Bar chart
9
Would a probability level of p>0.05 be significant?
Probably
Yes
Possibly
No
10
Which parametric test would you use to compare more than 2 groups?
Anova
t-test
Chi-square
Regression
11
the optimal sample size...
tells you how much variation you have
provides a good estimate of the true value
is too costly to figure out
None is correct
12
This branch of statistics organizes sample information.
Inferential Statistics
Descriptive Statistics
None are correct
Numerical Statistics
13
What is an outlier?
A value that is 3 Standard Deviations far from the mean
A value that is always useless
A value too far from the mean
A value that may be human error or experimental error
14
What non-parametric statistical test would you use to compare independent groups?
Wilcoxon signed ranks
Chi-square test
Mann-Whitney U test
Spearman's rho
15
What type of distribution is this?
A positively skewed distribution
A negatively skewed distribution
A positive correlation
A normal distribution
16
A correlation coefficient of + 0.86 indicates . . .
a strong positive correlation
a strong negative correlation
a moderate positive correlation
a moderate negative correlation
17
If your probability level is p<0.05 which hypothesis should you accept?
Negative hypothesis
Null hypothesis
Alternate hypothesis
Dispositional hypothesis
18
Which statistical method measures the relationship between two
continuous
variables?
t-test
Anova
chi-square
linear regression
19
What type of correlation does this graph show?
Negative
No correlation
A significant difference
Positive
20
If you use a p<0.01 level of significance you are more likely to make a…
Type 1 error
Significant result
False positive
Type 2 error
21
If you had a matched pairs design and your distribution is not normal, what test would you use?
Spearman's rho test
Chi-square test
Wilcoxon signed ranks test
Mann-Whitney U test
22
What type of graph is this?
Scattergraph
Bar chart
Histogram
Frequency polygon (line graph)
23
if you received a p-value of of 0.02, which of the following would you do?
reject the null hypothesis
fail to reject the null hypothesis
accept the null hypothesis
reject the alternative hypothesis
24
What is standard deviation?
How scores vary from the mean
The range
The square root of the variance
The average
25
What are the requirements of a parametric test?
A big difference in standard deviation scores
Skewed distribution of outcome data
Normal distribution of outcome data
Nominal data
26
In p<0.05 what does the p stand for?
Probability
Primary data
Possibility
Partiality
