You are comparing a sample average to a population average.A Z-score of 1.22 is obtained.This means that the observed difference between the two averages is real and meaningful and not due to chance.

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A Z-score of 1.22 indicates that the sample average is 1.22 standard deviations away from the population average, but it does not necessarily mean the difference is real, meaningful, or not due to chance. Typically, a Z-score must be greater than 1.96 or less than -1.96 (at a 0.05 significance level) to suggest a statistically significant difference.

You Are Comparing a Sample Average to a Population Average