Suppose a 95% confidence interval for the difference between two means is -1.34 and 2.79. Find the midpoint of these numbers, which is the best guess for the difference
Find the Midpoints of the Frequency Table. Class Frequency 90 − 99 4 80 − 89 6 70 − 79 4 60 − 69 3 50 − 59 2 40 − 49 1 Class Frequency 90 - 99 4 80 - 89 6 70 - 79 4 60 - 69 3 50 - 59 2 40 - 49
You can find the midpoint of each class by adding the lower class limit and the upper class limit, then dividing by two: Class midpoint = (lower
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