Data Analysis Basics

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Test your understanding about data analysis tools like descriptive, inferential, and bivariate

If Pearson’s correlation coefficient between stress level and workload is .8, how much variance in stress level is not accounted for by workload?

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20%

64%

36%

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When the correlation coefficient, r, is close to one:

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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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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 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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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?

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.70

.49

.30

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The process of using sample statistics to draw conclusions about population parameters is called

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experimentation.

inferential statistics.

primary sources.

descriptive statistics.

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The number of Indians travelling to work by car today is an example of

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discrete numerical data.

categorical data.

continuous numerical data.

discrete categorical data.

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Ordinal level data are characterized by:

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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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Which of the following BEST differentiates data analysis from interpretation?

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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:

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Multiple correlation coefficient.

Coefficient of determination.

Partial correlation coefficient.

Semi-partial correlation coefficient.

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In analysing categorical data, the following graphical device is not appropriate

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Pie chart.

Pareto diagram

Stem and leaf display.

Bar chart.

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