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35% of a sample of 300 professional baseball players indicated that their parents did not play...

35% of a sample of 300 professional baseball players indicated that their parents did not play baseball. Based on this sample, we estimate that approximately 35% of the parents of all professional baseball players did not play baseball, plus or minus 5%. This is an example of:

Finding the significance level.

Calculating descriptive statistics.

Using inferential statistics.    

Calculating the confidence level.
Math   Statistics-And-Probability   
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