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Statistics Review
Statistics Review
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1
What does a Z-score represent?
The probability of an event occurring
The raw score of a data point
The mean of a sample distribution
The number of standard deviations a value is from the mean
2
In a one-tailed test, a researcher is interested in:
Two variables that are unrelated
Only one specific direction of difference
Any significant difference between two groups
The relationship between multiple independent variables
3
Curve B would best be described as:
Mesokurtic
Normal
Platykurtic
Leptokurtic
4
The sharpness of the peak of a frequency-distribution curve is called:
Kurtosis
Deviation
Skewness
Distribution
5
If I wanted to know the mean of an entire group of people, I would use...
Scientific method
None of the above
Inferential statistics
Descriptive statistics
6
Which of the following is an example of a continuous variable?
Marital status
Age (in years)
Gender
Eye color
7
A Pearson's
r
of .9 suggests that the variables are:
Positively correlated
Negatively correlated
Have no correlation
Slightly correlated
8
Which measure of central tendency is most affected by extreme values?
Median
Range
Mode
Mean
9
All of the following are scales of measurement EXCEPT:
Ordinal
Metrical
Nominal
Interval
10
What is the primary purpose of a sampling distribution?
To eliminate errors in statistical analysis
To define the standard deviation of a dataset
To estimate the population mean using sample means
To measure the correlation between variables
11
Which of the following is an example of a discrete variable?
Number of schools attended
Anxiety score on a 100-point scale
Temperature in Celsius
Height
12
In a research study, the variable that is manipulated by the researcher is called:
Independent variable
Control variable
Dependent variable
Constant variable
13
The following image represents a data set that is:
Semi-skewed
Positively skewed
Negatively skewed
Normally distributed
14
What type of error occurs when a researcher rejects a null hypothesis that is actually true?
Type I error (false positive)
Type II error (false negative)
Measurement error
Sampling error
15
According to the Central Limit Theorem, as sample size increases, the sampling distribution will:
Increase standard deviation
Become more skewed
Become more normal
Become less normal
