Chapter 4

You are to calculate the z-score that is associated with the equivalent raw score for EACH of the raw score options listed below from the variable "SIBS." Use the mean and standard deviation calculated in the first part of the homework under descriptive statistics.

Using the "Standardize" Excel function (p. 94), please transform the raw score answers to their respective z-scores.It is NOT necessary to select, or highlight, the variable to calculate the z-score for a specific raw score.In fact, it may seem easier to use a blank Excel spreadsheet so as not to type over any information.The formula for transforming a raw score into a z-score is listed below.While I encourage you to use Excel, those who feel comfortable simply plugging the numbers into the formula may do so as it is a straight-forward formula.

Number of Siblings, X

What is the z-score when the raw score X = 0?

What is the z-score when the raw score X = 1?

What is the z-score when the raw score X = 2?

What is the z-score when the raw score X = 3?

What is the z-score when the raw score X = 4?

What is the z-score when the raw score X = 5?

What is the z-score when the raw score X = 6?

What is the z-score when the raw score X = 7?

If you have correctly calculated the z-scores for the above raw scores, when X = 3 or less, the transformed Z-score is negative.On the other hand, when X = 4 or more, the transformed z-score is positive.Why would that be?