Questions from Essentials of Statistics

Q: Calculate SS, variance, and standard deviation for the following sample

Calculate SS, variance, and standard deviation for the following sample of n = 5 scores: 2, 9, 5, 5, 9.

Q: / for the following set of sample scores: 2,

/ for the following set of sample scores: 2, 8, 4, 6, 5. What is your best guess about the actual value of variance in the population?

Q: A sample of n = 12 scores has a sample mean of

A sample of n = 12 scores has a sample mean of M = 60 and a sample standard deviation of s = 3. What are the values of ΣX and SS?

Q: A sample of n = 10 scores has a sample mean of

A sample of n = 10 scores has a sample mean of M = 25 and a sample standard deviation of s = 4. What are the values of ∑X and SS?

Q: For each of the following, list the class intervals that would

For each of the following, list the class intervals that would be best for a grouped frequency distribution. a. Lowest X = 3, highest X = 84 b. Lowest X = 17, highest X = 32 c. Lowest X = 52, highest...

Q: A population has a mean of μ = 100 and a standard

A population has a mean of μ = 100 and a standard deviation of σ = 20. Sketch a frequency distribution for the population and label the mean and standard deviation.

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

A population has a mean of μ = 50 and a standard deviation of σ = 10. a. If 3 points were added to every score in the population, what would be the new values for the mean and standard deviation? b. I...

Q: Compute the mean and standard deviation for the following sample of n

Compute the mean and standard deviation for the following sample of n = 5 scores: 70, 72, 71, 80, and 72. Hint: To simplify the arithmetic, you can subtract 70 points from each score to obtain a new s...

Q: For the following sample of n = 8 scores: 0,

For the following sample of n = 8 scores: 0, 1, 1/2, 0, 3, ½, 0, 1 a. Simplify the arithmetic by first multiplying each score by 2 to obtain a new sample. Then, compute the mean and standard deviation...

Q: For the following population of N = 6 scores: 2,

For the following population of N = 6 scores: 2, 9, 6, 8, 9, 8 a. Calculate the range and the standard deviation. (Use either definition for the range—see page 113.) b. Add 2 points to each score and...