Sample surveys conducted in a large county in a certain year and again 20 years later showed that originally the average height of 400 ten-year-old boys was 53.8 inches with a standard deviation of...


Sample surveys conducted in a large county in a certain year and again 20 years

later showed that originally the average height of 400 ten-year-old boys was 53.8

inches with a standard deviation of 2.4 inches, whereas 20 years later the average

height of 500 ten-year-old boys was 54.5 inches with a standard deviation of 2.5

inches. Use 0.05 level of significance to test the null hypothesis μ1 − μ2 = −0.5

against the alternative hypothesis μ1 − μ2 <>


Sep 10, 2022
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