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Exam 15: Correlation

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Question 41

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Correlation does not show causation.

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Question 42

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A positive correlation is always stronger than a negative correlation.

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The closer that data points fall to the regression line,the more closely two factors are related.

A correlation of r = .38 in a sample of 30 participants is statistically significant for a two-tailed test at a .05 level of significance.

A researcher measures the correlation of the time it take participants to complete two tasks purported to measure the same cognitive skill.Participant times are converted to ranks from fastest to slowest.If = 165 and n = 20,then what is the decision for this correlation test?

The correlation coefficient ranges from -1.0 to +1.0,with values closer to ±1.0 indicating

Homoscedasticity is the assumption that there is an equal variance of data points dispersed along the regression line.

The coefficient of determination is mathematically equivalent to eta-squared.

The point-biserial correlation coefficient is used to measure the correlation between two dichotomous variables.

The denominator of the Pearson correlation coefficient measures the extent to which two factors vary together.

A researcher measures the correlation in rankings for a sample of restaurants and consumers' rankings of their favorite restaurants.If = 96 and n = 12,then what is the value of the correlation coefficient?

A researcher computes the following phi correlation coefficient: = 0.42.If the sample size was 20,then what is the decision for this correlation test?

A researcher measures the correlation between gender and student aptitude scores from 0 to 100 among 20 participants.If = 0.49,then what is the decision for this correlation test?

The value of the sum of products can be positive or negative.

The coefficient of determination is the square root of the correlation coefficient.

An unanticipated variable not accounted for in a research study that could be causing or associated with observed changes in one or more measured variables is called

The phi correlation coefficient is a measure for the direction and strength of the linear relationship between two ________ variables.

If = 5.32 and n = 40,then what is the value of the coefficient of determination?

The following graphs display the data points for two linear correlations.Based on the information provided in these graphs,________ displays a negative correlation and ________ displays a stronger correlation.

The denominator of the correlation coefficient measures the extent to which two variables