| MA 117 Probability and Statistics Math - Block 4 - 2001 |
| Reading in preparation for Tuesday, Day TWO: |
| Chapter Nineteen | |||||||||
| Read this chapter, pp. 333 - 346 (sections 1 to 7, but not 8) | Make sure you understand the meanings of
the following concepts:
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| Poliomyelitis Handout | Turn in your written answers to questions 2, 6, 7, and 9 at the end of the handout on Tuesday. | ||||||||
| Chapter Three | |||||||||
| Read about histograms, pp. 31 - 33. |
1. Notice that it is area rather than height which represents a percentage in a histogram. Refer to the graph at the top of page 32, and answer this question as true or false: More families earn $5,000 to $6,000 than earn $25,00 to $30,0002. Look through about half the exercises in set A. |
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| Read pp. 35 - 37 about drawing a histogram. |
3. Make a histogram of the following data: A group of people take a personality test. 40% score between 0 and 5, 40% score between 5 and 15, and 20% score between 15 and 20. (The left endpoint convention is being used). Don’t plot the percents!!
4. What if anything would be wrong with using a historical control to determine if the Salk vaccine was effective or not? |
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| Read about the density scale pp. 38 - 41 | 5. Add a scale to your histogram from the
last question. Why is it not appropriate to simply call the vertical scale
on your graph ‘percentage’.
6. Can you answer question 1 in exercise set C by using the density scale? |
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| Read about Variables pp.
42 -44
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7. What variable is being measured in question 3 above? Is the variable quantitative? Discrete? 8. Give two additional examples of quantitative variables, and of qualitative variables. |
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| Read about Controlling for a Variable, pp. 45 - 7 | 9. Is the study of the effect of the contraceptive pill on blood pressure a controlled experiment or an observational study? What are possible confounding factors? | ||||||||
| Read about cross tabulation, pp. 47 - 48. | 10. Answer question 2 from exercise set F. | ||||||||
| Chapter Four | |||||||||
| Read about the average, and longitudinal vs. cross sectional studies, pp. 57 - 63 |
1. Is the HANES survey cross-sectional or longitudinal? 2. Why does 5 feet 3.5 inches not represent the height of an average college aged woman well? 3. If a histogram has a long tail extending to the right, is its median or its mean likely to be larger? |
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| Read about the root mean square and standard deviation, pp. 66 - 74. |
4. Consider the list 4 2 3 3. A) What is the rms of the list? B) What are the deviations? C) What is the rms of the deviations? D) What is the standard deviation? 5. Enter -1 and 1 as data into you calculator and have your calculator figure out the standard deviation. Is you calculator finding SD or SD+?
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