What do Test Scores Really Mean?. Rebecca Mann rlmann@purdue.edu. Why test?. School effectiveness Determine what students know and can do Compare student achievement to achievement of similar students Compare student ability level and achievement. Norm vs. Criterion Referenced.

ByVariability. Chapter 4. What is it?. How much difference there is from person to person How spread out scores are No variability = all scores are the same. Why do we care?. Less variability = more know about the population based on the sample

By1-7 Variance & Standard Deviation. Investigation…. Let’s take a look at the following two sets of notebook grades: A: {59, 60, 60, 62, 63, 64, 67, 68, 68, 69} B: {59, 63, 64, 64, 64, 64, 64, 64, 65, 69} Create a dotplot for each set of data…. 59 61 63 65 67 69.

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ByChapter 5 – Measurements of Variability. Math 22 Introductory Statistics. Measures of Variability. Range - The difference between the highest and lowest measurement. Range = Highest – Lowest Deviation = Observation – Mean . Standard Deviation and Variance.

ByValuing Cash Flows. Non-Contingent Payments. Non-Contingent Payouts. Given an asset with fixed payments (i.e. independent of the state of the world), the asset’s price should equal the present value of the cash flows. . Treasury Notes.

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ByAre you here?. Yes, and I’m ready to learn Yes, and I need a nap No. Apple Problem. When a truck load of apples arrives at a packing plant, a random sample of 125 is selected and examined for bruises, discoloration, and other defects.

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ByStandard Deviation and Z score. Algebra I. Standard Deviation. Definition – When looking at a set of data, the distance away from the mean. The center is considered the most ‘typical’. How far from ‘typical’ is the data?. Standard Deviation.

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