a. A sample of n = 8 scores has a mean of M = 7. If one score is changed from X = 20 to X = 4, what is the value of the new sample mean? b. A sample of n = 5 scores has a mean of M = 12. If one new...

a. A sample of n = 8 scores has a mean of M = 7. If one score is changed from X = 20 to X = 4, what is the value of the new sample mean?

b. A sample of n = 5 scores has a mean of M = 12. If one new score with a value of X = 18 is added to the sample, then what is the mean for the new sample?