PSY 245 Week 4 Descriptive Statistics Quiz

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 PSY 245 Week 4 Descriptive Statistics Quiz
 

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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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