Data Description and Analysis Quiz

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Questions and Answers

When describing data with averages, which measure is influenced by extreme values?

Mean (correct)
Median
Range
Mode

What type of data can be described using normal distributions and standard (z) scores?

Interval data (correct)
Nominal data
Ordinal data
Ratio data

Which type of variable can take on an infinite number of possible values within a given range?

Discrete variable
Binary variable
Continuous variable (correct)
Categorical variable

When describing data with averages, which measure is less influenced by extreme values?

Median (B) Signup and view all the answers

In describing variability, which measure represents the average of the squared differences from the mean?

Variance (A) Signup and view all the answers

Which type of variable can take on only a limited, distinct number of values?

Discrete variable (B) Signup and view all the answers

Match the following types of data with their descriptions:

Quantitative data = Can be measured and expressed numerically Categorical data = Consists of categories or groups Ordinal data = Has a natural order or ranking Nominal data = No intrinsic ranking or order Signup and view all the answers

Match the following variables with their types:

Independent variable = Manipulated or controlled by the experimenter Dependent variable = Affected by changes in the independent variable Discrete variable = Takes on specific, separate values Continuous variable = Can take on any value within a given range Signup and view all the answers

Match the following measures of variability with their descriptions:

Range = The difference between the highest and lowest values Variance = The average of the squared differences from the mean Standard deviation = A measure of the amount of variation or dispersion of a set of values Interquartile range = The range of the middle 50% of the data Signup and view all the answers

What type of data is described in Unit II?

Quantitative and qualitative data (D) Signup and view all the answers

Which method is NOT used for describing data in the unit?

Regression analysis (C) Signup and view all the answers

What is used for describing data with tables and graphs?

Frequency distributions (B) Signup and view all the answers

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Study Notes

Descriptive Statistics

When describing data with averages, the mean is influenced by extreme values.
The mean is less influenced by extreme values compared to the median.

Types of Data and Variables

Continuous variables can take on an infinite number of possible values within a given range.
Discrete variables can take on only a limited, distinct number of values.
Normal distributions can be described using standard (z) scores.

Measures of Variability

Variance represents the average of the squared differences from the mean.
Standard deviation is used to describe variability, but its description is not provided.

Data Description and Visualization

Unit II data is described using tables and graphs.
Frequency tables and histograms are used for describing data in the unit.
Scatter plots are not used for describing data in the unit.