Questions from Essentials of Statistics

Q: The stimulant Ritalin has been shown to increase attention span and improve

The stimulant Ritalin has been shown to increase attention span and improve academic performance in children with ADHD (Evans et al., 2001). To demonstrate the effectiveness of the drug, a researcher...

Q: Callahan (2009) demonstrated that Tai Chi can significantly reduce symptoms

Callahan (2009) demonstrated that Tai Chi can significantly reduce symptoms for individuals with arthritis. Participants were 18 years old or older with doctor-diagnosed arthritis. Self-reports of pai...

Q: There is some evidence suggesting that you are likely to improve your

There is some evidence suggesting that you are likely to improve your test score if you rethink and change answers on a multiple-choice exam (Johnston, 1975). To examine this phenomenon, a teacher gav...

Q: a. A repeated-measures study with a sample of n

a. A repeated-measures study with a sample of n = 6 participants produces a mean difference of MD = 4 with SS= 30. Use a two-tailed hypothesis test with a = .05 to determine whether this sample provid...

Q: a. A repeated-measures study with a sample of n

a. A repeated-measures study with a sample of n = 8 participants produces a mean difference of MD = 3 with a variance of s2 = 72. Use a two tailed hypothesis test with a = .05 to determine whether it...

Q: A sample of difference scores from a repeated-measures experiment has

A sample of difference scores from a repeated-measures experiment has a mean of MD = 4 with a standard deviation of s = 6. a. If n = 9, is this sample sufficient to reject the null hypothesis using a...

Q: Participants enter a research study with unique characteristics that produce different scores

Participants enter a research study with unique characteristics that produce different scores from one person to another. For an independent-measures study, these individual differences can cause prob...

Q: Swearing is a common, almost reflexive, response to pain.

Swearing is a common, almost reflexive, response to pain. Whether you knock your shin into the edge of a coffee table or smash your thumb with a hammer, most of us respond with a streak of obscenities...

Q: Place the following scores in a frequency distribution table. Based on

Place the following scores in a frequency distribution table. Based on the frequencies, what is the shape of the distribution?

Q: Playing three-dimensional video games can improve cognitive function in older

Playing three-dimensional video games can improve cognitive function in older adults. In a recent experiment (West et al., 2017), a sample of n = 15 older adults were instructed to play Super Mario 64...