exam Maths Puzzle Numerical Ability

In order to use the test statistic for the difference between two sample means both samples must have a population of at least 30 and the samples must be from dependent populations. Is this answer true or false?

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exam Other Question

SUPPOSE X IS A POSITIVE AND Y IS A NEGATIVE. WHICH EQUATION WOULD RENDER THE HIGHEST NUMBER?

A. X+Y
B. X-Y
C. Y-X
D. /Y/-X Are the sets of lines parallel, perpendicular, or neither:
Line 1 is through (-4,-7) and (1,3) and Line 2 is through (2,6) and (4,10)
Thanks in advance