# PSY 245 WEEK 4 Descriptive Statistics Quiz

## PSY 245 WEEK 4 Descriptive Statistics Quiz

Descriptive Statistics Quiz

**Answer** each of the following questions (multiple-choice or short-answer) according to the question prompt.

- The number that occurs most frequently in a data set is
- mean
- median
- mode
- harmonic

- What type of graphic presents data in terms of frequencies per category?
- Pie chart
- Line graph
- Bimodal distribution
- Histogram

- When you are dealing with a normal distribution of scores, which measure of central tendency is preferred?
- Mean
- Median
- Mode
- All of the above, as they will be the same in this distribution

- The _______ is a single number that represents the total amount of variability in a distribution.
- standard deviation
- variance
- range
- mean

- Correlation coefficients represent
- The degree of relationship between two variables
- causality between two relationships
- whether the independent variable had an effect
- all of the above

- Which of the following would probably be negatively correlated?
- The number of days in class and exam grade
- The height and weight of college students
- The number of difficult classes taken and semester GPA
- Overall college GPA and graduate school GPA

- A perfect positive correlation occurs when
- an increase of 1 unit is always accompanied by a proportional increase in the other variable
- there is no relationship between the two variables
- an increase of 1 unit is always accompanied by a lesser increase in the other variable
- an increase of 1 unit is always accompanied by a greater increase in the other variable

- You are reading an article that says age and number of sick days taken per year has a correlation of -0.72. How would you interpret this correlation?
- A weak, positive correlation
- A weak, negative correlation
- A strong, negative correlation
- A strong, positive correlation

- If a data set has the following data points―5,6,7,6,7―you would expect the standard deviation to be
- a small number, because the numbers do not vary much from the mean of 6.2
- a large number, because the numbers do not vary much from the mean of 6.2
- a large number, because the numbers vary a great deal from the mean of 6.2
- a small number, because the numbers vary a great deal from the mean of 6.2

- Descriptive statistics are
- procedures using the experimental method
- procedures used to analyze data after an experiment
- procedures used to summarize a set of data
- all of the above

- The standard deviation is the square root of the
- variance
- mean
- range
- sum of the raw scores

- Define
*nominal data*, and provide an example.

- Define
*ordinal data*, and provide an example.

- Define
*interval data*, and provide an example.

- Define
*ratio data*, and provide an example.

- If you are dealing with percentages that total 100%, the best graph to represent your data is a
- bar graph
- pie chart
- histogram
- frequency polygon

- If you want to know which score in a data set occurred the most often, you would use a
- mean
- median
- range
- mode

- Which measure of central tendency is less accurate if there are a few extremely large or extremely small numbers in the data set?
- Median
- Mode
- Mean
- Range

- Graphical representations of data sets
- allow an easy way to represent large sets of numbers
- are less confusing than several numbers in a descriptive paragraph
- allow a point to be easily understood
- all of the above

- Which type of graph is frequency used to depict experimental results?
- Pie chart
- Histogram
- Frequency polygon
- Line graph

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PSY 245 WEEK 4 Descriptive Statistics Quiz