Exam 12: Understanding Research Results: Description and Correlation

_____ refers to the strength of association between variables.

How does restricting the range of a variable affect the correlation coefficient?

Anastasia finds the relationship between alcohol consumption and reaction time as -.63. However, the relationship between coffee consumption and reaction time is +.52. What can she conclude from this data?

Variables with _____ scale levels exhibit minimal quantitative distinctions.

A correlation coefficient can be used when both variables use:

A researcher finds that the correlation between two variables is +.63, but this correlation drops to +.20 when a third variable is partialed out. In this case, the researcher should conclude that the third variable:

Which of the following is a measure of variability?

The Pearson product-moment correlation coefficient (r) does not detect:

Which of the following is a measure of central tendency?

In the general form of a regression equation given by Y = a + bX, the letter X represents _____.

At the beginning of the season, a sports writer predicts the teams that will finish in the top three places in the eastern, central, and western divisions. In this scenario, which type of measurement scale is the sports writer likely to have used?

The measure of central tendency that reflects the most frequent score is the _____.

Which of the following statements is true of the correlation coefficient?

A researcher obtains a -.87 correlation between the age of job applicants and their likelihood to be hired. However, she thinks that job skills may be an important influence. In this case, she should calculate:

When studying the effect of temperature on the sale of ice cream, a researcher records the number of ice cream cones sold on cold days versus those sold on hot days. In this case, the researcher would most likely compare _____ to describe the results.

Which of the following statements is true about standard deviation?

An interval scale is preferable to an ordinal scale because:

Craig examines the effect of different genres of music, such as jazz, rock, rap, on task performance. Which type of measurement scale do the genres of music represent?

A professor at a university ranks subjects based on students' preferences identified through a survey. He ranks science first, mathematics second, and management third. What type of measurement scale has the professor employed?

In the context of effect size, the r² value is sometimes referred to as the: