# Question

For each of the following samples, determine the interval width that is most appropriate for a grouped frequency distribution and identify the approximate number of intervals needed to cover the range of scores.

a. Sample scores range from X 5 8 to X 5 41.

b. Sample scores range from X 5 16 to X 5 33.

c. Sample scores range from X 5 26 to X 5 98.

a. Sample scores range from X 5 8 to X 5 41.

b. Sample scores range from X 5 16 to X 5 33.

c. Sample scores range from X 5 26 to X 5 98.

## Answer to relevant Questions

What information can you obtain about the scores in a regular frequency distribution table that is not available from a grouped table? A sample of n = 15 scores has a mean of M = 6. One person with a score of X = 22 is added to the sample. What is the value for the new sample mean? A sample of n = 9 scores has a mean of M = 20. One of the scores is changed and the new mean is found to be M = 22. If the changed score was originally X = 7, what is its new value? In words, explain what is measured by each of the following: a. SS b. Variance c. Standard deviation Calculate SS, variance, and standard deviation for the following sample of n = 4 scores: 7, 4, 2, 1.Post your question

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