Exam 3: Univariate Population Parameters and Sample Statistics

Without doing any computations, which of the following distributions has the largest variance? X f Y f Z f 64 1 50 2 80 3 66 1 60 2 81 2 69 5 75 2 82 2 74 2 80 2 83 2 76 1 85 6 84 2 78 4 90 2 85 4 79 1 95 2 86 2 80 5 100 2 87 3

Without doing any computations, which of the following distributions has the largest variance? X f Y f Z f 100 1 110 5 99 1 111 4 112 1 120 4 115 1 114 2 125 4 120 1 117 2 127 4 122 4 118 2 130 2 125 1 125 1 132 3 130 1 128 1 135 1 135 7 129 6 175 1

Without doing any computations, which of the following distributions has the largest variance? X f Y f Z f 30 3 41 2 45 3 36 2 42 4 46 1 40 3 44 2 48 1 41 2 45 4 51 3 48 2 51 2 53 3 50 3 52 2 55 3 52 2 53 2 59 3 60 3 54 2 60 3

The mean is a function of which scores in the distribution?

Compute the mean for the following values: 4, 8, 6, 1, 0, 9

For the following data, and assuming an interval width of 1, compute the following using SPSS: a. Mode b. Median c. Mean d. Exclusive range e. Standard deviation f. Variance X 15000 15000 15000 15000 15000 15000 15000 25000 25000 25000 25000 25000 42000 42000 45000 45000 50000 50000 65000 70000

For the following data, and assuming an interval width of 1, compute the following: X 25 21 16 18 19 21 21 22 17 19 a. Mode b. Median c. Mean d. Exclusive and inclusive range e. H spread f. Variance and standard deviation

For which measurement scales is computing the mean appropriate? Select all that apply.