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I have a hunch that people are getting taller, and I want to test to see...

I have a hunch that people are getting taller, and I want to test to see if my hunch is true. I selected a random sample of 15 fathers and their adults sons to be in a study. I find that fathers have an average height of 71 inches and their sons have an average height of 73 inches. the standard deviation of the difference betweenn the means is 1.3 set alpha to 0.5

IV ? DV ? H0 ? HA? is this a one tailed or two tailed test ? state the criterion for rejection .... compute and report the test statistic ? make a decision and report conclusion.

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