exam Maths Puzzle Numerical Ability

A paired difference test is being conducted involving 19 pairs of observations. What is the number of degrees of freedom for the test statistic?
a. 18
b. 19
c. 37
d. 38

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exam Other Question

find the length x in the following triangle

express it in simplified radical form

the left side is 12 the right side is x and the bottom is 8
Find an equation of an ellipse having the given intercepts:

x-intercept: ±3

y-intercept: ±4