# The overall mean is a weighted mean

? Question 1 10 out of 10 points

The overall mean is a weighted mean.

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? Question 2 10 out of 10 points

The mean must have a value equal to one of the scores in the distribution.

? Question 3 10 out of 10 points

The variance is the square root of the standard deviation.

? Question 4 10 out of 10 points

The equation for standard deviation is the same regardless of whether the scores are of a sample or a population.

? Question 5 10 out of 10 points

The symbol SS stands for sum of squares.

? Question 6 10 out of 10 points

If a group of 100 people has an average IQ of 107 and a group of 50 people has an average IQ of 101, the average IQ of all the people is 105.

? Question 7 10 out of 10 points

In general, ? X2 = (? X)2

? Question 8 10 out of 10 points

A deviation score is the same thing as a raw score.

? Question 9 10 out of 10 points

In a positively skewed distribution, the mean has a higher value than the median.

? Question 10 10 out of 10 points

With grouped scores, the mode is the mid-point of the interval with the highest frequency.