Trial Calcs.docx

# Trial Calcs.docx - Given the following table Step 1 Plot...

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Given the following table Step 1: Plot, and calculate M, variance, SD, a) Observe the scores of both x and y, does it look that there is high variability? Low variability. Is there more variability in x or y (on face value) b) Sketch a scatterplot of x and y, do you observe a likely positive or negative correlation? c) Calculation the M, variance, and SD of both x and y Remember, variance = s 2 , so you find the mean, and take each individual value, and subtract the mean from this value (column XA and YA), then square each new value (columns XB and YB), sum these values, and fill in column SSx, and SSy, these are you sums of squares d) Divide your Sums of Squares by n-1 (this is a sample, after all) e) You have your variance (s 2 ) f) Calculation your standard deviations (sqrrt your variance), interpret them, are they consistent with what you thought they would be at face value? Step 2: Get your z scores. a) In the x column of scores, there is a value (4), calculate the associated Z b) Do the same for value 7 c) What proportion falls between these two numbers, using the z table. Look at the actual

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• Fall '19

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