Questions from Essentials of Statistics

Q: Problem 17 demonstrates that removing individual differences can substantially reduce variance and

Problem 17 demonstrates that removing individual differences can substantially reduce variance and lower the standard error. However, this benefit only occurs if the individual differences are consist...

Q: Exercise is known to produce positive psychological effects. Interestingly, not

Exercise is known to produce positive psychological effects. Interestingly, not all exercise is equally effective. It turns out that exercising in a natural environment (e.g., jogging in the woods) pr...

Q: Gamification refers to the application of game design and development to social

Gamification refers to the application of game design and development to social, industrial, and educational settings. For example, a gamification program might award points or achievements to people...

Q: To construct the following data, we started with the scores in

To construct the following data, we started with the scores in Problem 20 and scrambled the scores in Treatment 2 to eliminate the consistency of the individual differences. a. If the data were from a...

Q: Explain the difference between a matched-subjects design and a repeated

Explain the difference between a matched-subjects design and a repeated-measures design.

Q: A researcher conducts an experiment comparing two treatment conditions with 20 scores

A researcher conducts an experiment comparing two treatment conditions with 20 scores in each condition. a. If an independent-measures design is used, how many participants are needed for the study? b...

Q: A repeated-measures, a matched-subjects, and an

A repeated-measures, a matched-subjects, and an independent-measures study all produce a t statistic with df = 10. How many participants were used in each study?

Q: Traumatic brain injury (TBI) is a significant health problem.

Traumatic brain injury (TBI) is a significant health problem. TBI is caused by impacts to the head that might occur during contact sports, motor vehicle accidents, and similar events. TBI is known to...

Q: If you are using coffee to compensate for sleep loss, you

If you are using coffee to compensate for sleep loss, you might want to consider drinking your coffee under blue light. Beaven and Ekstrom (2013) recruited n 5 21 participants who completed a series o...

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

For the following set of scores: a. Construct a frequency distribution table. b. Sketch a histogram showing the distribution. c. What is the shape of the distribution?