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Data Analysis Basics
Test your understanding about data analysis tools like descriptive, inferential, and bivariate
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If Pearson’s correlation coefficient between stress level and workload is .8, how much variance in stress level is not accounted for by workload?
1 point
20%
64%
8%
36%
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When the correlation coefficient, r, is close to one:
1 point
there is no relationship between the two variables
there is a strong linear relationship between the two variables
it is impossible to tell if there is a relationship between the two variables
the slope of the regression line will be close to one
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Which of the following BEST differentiates data analysis from interpretation?
1 point
Interpretation requires more conceptual and integrative thinking than data analysis.
Interpretation involves computerized analysis of data.
Data analysis is explanatory and interpretation is conceptual.
Data analysis involves conceptualization but interpretation does not.
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R2 is known as the:
1 point
Multiple correlation coefficient.
Coefficient of determination.
Partial correlation coefficient.
Semipartial correlation coefficient.
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A correlation of .7 was found between time spent studying and percentage on an exam. What is the proportion of variance in exam scores that can be explained by time spent studying?
1 point
.70
.49
.30
.7
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Ordinal level data are characterized by:
1 point
Data that can be meaningfully arranged by order of magnitude.
Equal intervals between each adjacent score.
A fixed zero.
None of the above.
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The number of Indians travelling to work by car today is an example of
1 point
discrete numerical data.
categorical data.
continuous numerical data.
discrete categorical data.
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The intercept in linear regression represents:
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the strength of the relationship between x and y
the expected x value when y is zero
the expected y value when x is zero
a population parameter
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In analysing categorical data, the following graphical device is not appropriate
1 point
Pie chart.
Pareto diagram
Stem and leaf display.
Bar chart.
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A summary measure that is computed from only a sample of the population is called
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A parameter.
A census.
A statistic.
The scientific method.
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The process of using sample statistics to draw conclusions about population parameters is called
1 point
experimentation.
inferential statistics.
primary sources.
descriptive statistics.
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