Descriptive Statistics Quiz- PSY 245 WEEK 4

Descriptive Statistics Quiz- PSY 245 WEEK 4

Descriptive Statistics Quiz- PSY 245 WEEK 4
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

Click the Descriptive Statistics Quiz- PSY 245 WEEK 4  and submit.

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