Questions from Essentials of Statistics

Q: For the data in the following sample: 1, 1,

For the data in the following sample: 1, 1, 9, 1 a. Find the mean, SS, variance, and standard deviation. b. Now change the score of X = 9 to X = 3, and find the new values for SS, variance, and standa...

Q: Luhmann, Schimmack, and Eid (2011) were interested in

Luhmann, Schimmack, and Eid (2011) were interested in the relationship between income and subjective well-being. The researchers measured participants’ income across time between 199...

Q: Everyone experiences “ups and downs” in life satisfaction. Boehm

Everyone experiences “ups and downs” in life satisfaction. Boehm, Winning, Segerstrom, and Kubzansky (2015) studied whether such variability in life satisfaction is...

Q: If you have ever tried to learn a new mechanical skill,

If you have ever tried to learn a new mechanical skill, you probably noticed that the hand-eye coordination needed to perform the skill is learned with practice. To demonstrate the effects of such pra...

Q: One population has a mean of μ = 50 and a standard

One population has a mean of μ = 50 and a standard deviation of σ = 15, and a different population has a mean of μ = 50 and a standard deviation of σ = 5. a. Sketch both distributions, labelling μ and...

Q: You are interested in how much time you spend on InstagramTM so

You are interested in how much time you spend on InstagramTM so you recorded the number of minutes spent browsing your newsfeed each day for three weeks. You obtain the following data: a. Create a gro...

Q: A teacher is interested in the effect of a study session on

A teacher is interested in the effect of a study session on quiz performance. Two different classes receive a pretest (before the study session) and a posttest (after the study session). Thus, the tea...

Q: Calculate the range and interquartile range for the following set of scores

Calculate the range and interquartile range for the following set of scores from a continuous variable: 23, 13, 10, 8, 10, 9, 11, 12.

Q: In words, explain what is measured by variance and standard deviation

In words, explain what is measured by variance and standard deviation.

Q: Is it possible to obtain a negative value for SS (sum

Is it possible to obtain a negative value for SS (sum of squared deviations), variance, and standard deviation?