Questions from Essentials of Statistics

Q: The following table summarizes the results from a two-factor study

The following table summarizes the results from a two-factor study with two levels of factor A and three levels of factor B using a separate sample of n = 8 participants in each treatment condition. F...

Q: The diathesis stress approach to mental illness proposes that neither environmental stress

The diathesis stress approach to mental illness proposes that neither environmental stress alone nor genetic factors alone are enough to produce mental illness. Instead, both environmental stress and...

Q: Eyewitnesses in jury trials are influenced by memory processes like forgetting.

Eyewitnesses in jury trials are influenced by memory processes like forgetting. Jurors seem to also be influenced by instructions that encourage skepticism and the language used in eyewitness testimon...

Q: Suppose that a researcher was interested in the effect of caffeine on

Suppose that a researcher was interested in the effect of caffeine on memory. She measured memory performance either immediately after studying (0-day delay) or after a 10-day delay. Half of the parti...

Q: Ford and Torok (2008) found that motivational signs were effective

Ford and Torok (2008) found that motivational signs were effective in increasing physical activity on a college campus. Signs such as “Step up to a healthier lifestyle” and “An average person burns 10...

Q: The following matrix presents the results of a two-factor study

The following matrix presents the results of a two-factor study with n = 10 scores in each of the six treatment conditions. Note that one of the treatment means is missing. a. What value for the missi...

Q: A researcher conducts an independent-measures, two-factor study

A researcher conducts an independent-measures, two-factor study with two levels of factor A and three levels of factor B, using a sample of n = 10 participants in each treatment condition. a. What are...

Q: Calculate SP (the sum of products of deviations) for the

Calculate SP (the sum of products of deviations) for the following scores. Note: Both means are whole numbers, so the definitional formula works well.

Q: For the following set of scores, / a.

For the following set of scores, a. Compute the Pearson correlation. b. Add 2 points to each X value and compute the correlation for the modified scores. How does adding a constant to every score affe...

Q: Judge and Cable (2010) demonstrated a positive relationship between weight

Judge and Cable (2010) demonstrated a positive relationship between weight and income for a group of men. The following are data similar to those obtained in the study. To simplify the weight variable...