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# Using Data and Grading on a Curve

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1. Is primary data (self-collected data) better than secondary data (someone else's collected data; for example, school database data or census data? Which one would you use in your action research?

2. As a teacher, you have made the decision to grade your class based on the normal curve. Is this fair to students? Why or why not?

#### Solution Preview

1. I can see benefits for both primary and secondary data. If you collect it yourself, then you have complete control over the methodology and will probably have significant confidence in the outcomes. You were in control of the research, so there is only one chef in the kitchen. I would think this would also increase the validity of the findings as well.

However, using secondary data also has benefits. Sure, you are reading someone else's findings so the chances of there being some kind of error is present. But, one thing all good scientists are always looking for is was to improve upon the experiment. Every empirical article I have ever read has an "implications for the future" section. By using some else's data, you have the ability to deeply analyze what they did, find the holes, and ...

#### Solution Summary

This response discusses the advantages of using primary data sources versus secondary data sources. It also gives an opinion about the educational process of grading on a curve.

\$2.19

## Normal distributions and Z scores Box plot and relation to normal distribution Grading on a curve. Pros and Cons.

Give an example from everyday life where you could use the Normal distribution to determine the probability of something.

What is a z score and how could calculating a z help you in a business situation?

How does a box plot relate to the normal distribution? In what ways are they similar? In what ways are they different?

When working with the normal distribution to find probabilities, we often have to subtract the probability value that we found in the table from .5. Why do we do this? What is a good way to remember when to subtract from .5 or not?

Some teachers grade on a curve using the normal distribution to even out the scores. What do you think of this practice?

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