Exercise: Test of Equal Variances
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Data File: Equal_Variances.MTW
Situation:
A nutrition consulting company created an education program to increase the calcium intake in children ages 9 to 13. To measure the effectiveness of the program, an analyst performs an experiment in which 198 children are assigned randomly to either the control group (no education program) or the treatment group (with education program). The average daily dietary calcium intake is calculated from three-day diet records.
Before the analyst can perform hypothesis tests, she needs to know if the variances of the two groups are equal or not so that she can determine what type of hypothesis test to use (parametric or non-parametric). Use the “Equal_Variances.MTW” data file to perform a test of equal variances and determine if the two groups have equal variances.
Question:
Do the two groups have different variances?
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