Questions from Essentials of Statistics

Q: A researcher conducts an independent-measures study comparing two treatments and

A researcher conducts an independent-measures study comparing two treatments and reports the t statistic as t(20) = 2.09. a. How many individuals participated in the entire study? b. Using a two-taile...

Q: In a recent study, Piff, Kraus, Côté, Cheng

In a recent study, Piff, Kraus, Côté, Cheng, and Keltner (2010) found that people from lower socioeconomic classes tend to display greater prosocial behavior than their higher-class counterparts. In o...

Q: If other factors are held constant, explain how each of the

If other factors are held constant, explain how each of the following influences the value of the independent measures t statistic, the likelihood of rejecting the null hypothesis, and the magnitude o...

Q: In 1974, Loftus and Palmer conducted a classic study demonstrating how

In 1974, Loftus and Palmer conducted a classic study demonstrating how the language used to ask a question can influence eyewitness memory. In the study, college students watched a film of an automobi...

Q: One sample has SS = 80 and a second sample has SS

One sample has SS = 80 and a second sample has SS = 48. a. If n = 17 for both samples, find each of the sample variances, and calculate the pooled variance. Because the samples are the same size, you...

Q: Two separate samples receive different treatments. After treatment, the first

Two separate samples receive different treatments. After treatment, the first sample has n = 5 with SS = 60, and the second has n = 9 with SS = 84. a. Compute the pooled variance for the two samples....

Q: Research results suggest a relationship between the TV viewing habits of 5

Research results suggest a relationship between the TV viewing habits of 5-year-old children and their future performance in high school. For example, Anderson, Huston, Wright, and Collins (1998) repo...

Q: Draw a polygon for the distribution of scores shown in the following

Draw a polygon for the distribution of scores shown in the following table.

Q: Does posting calorie content for menu items affect people’s choices in fast

Does posting calorie content for menu items affect people’s choices in fast-food restaurants? According to results obtained by Elbel, Gyamfi, and Kersh (2011), the answer is no. The researchers monito...

Q: A long history of psychology research has demonstrated that memory is usually

A long history of psychology research has demonstrated that memory is usually improved by studying material on multiple occasions rather than one time only. This effect is commonly known as distribute...