Exam 23: Using Statistics to Examine Relationships

The Pearson product-moment correlation for two variables, fear of embarrassment and anxiety just before making an oral presentation, is r = 0.78, with a coefficient of determination of 0.6084. This means that what percentage of anxiety just before making an oral presentation can be attributed to fear of embarrassment?

What is the connection between a scatter plot and a calculation of correlation?

The calculated Pearson r was -0.95 in a research study on number of hours parents spent at children's sporting events and number of arrests those children had experienced by age 30. What does this Pearson r value signify?

A researcher develops a new instrument for measuring adjustment to widowhood in dependents whose spouses were killed in armed conflict. The researcher's initial instrument contains 55 items, and the researcher wants to trim these down to 25 or 30 but doesn't want to lose any of the main concepts. What method of statistical analysis will the researcher use, in order to pare this tool down to a manageable size without loss of content?

A study examines the relationship between strength of belief in previous lives (Yes, Not Sure, and No) and percentage of butterfat in milk most commonly purchased (Non-Fat, 1%, 2%, Whole). The data could be analyzed by which statistical test?

Twelve research studies show a strong correlation between low levels of education and poverty. A social scientist declares that the "cure" for poverty is in free education for all of the children of the poor. What are valid arguments against this declaration?

What does bivariate correlational analysis do?

Which of the following variables are able to be analyzed using the Pearson product-moment correlation?

A Pearson correlational analysis examines the relationship between variable A, hours of sleep per week, and B, symptom severity, in 43 women with post-polio syndrome. In accessing the table of values, the researcher should use which number for degrees of freedom?

In the results and conclusions sections of a research article about adult morbid obesity and a history of being underweight during the first 2 years of life, the researcher mentions the strong negative correlation between these two variables. What does the author imply by stating this?

For which of the following levels of measurement would a parametric statistical test like the Pearson product-moment correlation coefficient be used?

What does the correlational diagram X Y mean?

In the results and conclusions sections of a research paper about predelinquent behavior, the researcher mentions the strong correlational relationship between the number of incidents of predelinquent behavior and the number of hours the mother works outside the home. What does the author imply by stating this?

Which correlation coefficient shows the strongest relationship?