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# Homework for Statistics Lesson 1

 `Answer Completely.` `Use complete sentences.` `Due Tue., July 12, 2005, 10:30:00.000, EDT.` `Due on the teacher's desk in BH114.`
1. The Hinkle textbook on pages 1 and 2 gives at least three meanings for the word statistics. What are they? Which one correlates with the meaning of statistic given on page 12?

2. Use summation notation to express the average of: 1, 1, 2, 4, 7.

3. The additional answer given for the Hinkle textbook chapter 1 exercises 6c, 6d, and 7c are not explained in the textbook. Are they correct? Why or why not.

4. What might the mnemonic "Please Excuse My Dear Aunt Sally" have to do with anything in this chapter?

5. At http://etd.nd.edu search for a dissertation by Calkins and examine the abstract. You will find a precise value given for the cesium D1 centroid frequency. How many significant digits are there in that result?

6. Consider the phrase "The data is ...." Is this common usage? Is this grammatically correct?

7. The Hinkle textbook on page 9 says the letter grades for a history course are ordinal. Are they for this course?

8. The Hinkle textbook on page 10 says "Temperature is ... measured on an interval scale." Is this true for Kelvin and Rankine?

9. Consider grade point averages (GPAs) which assign numeric values to certain letter grades. What level of measurement is a GPA? What does this assume about the level of measurement of the underlying letter grades?

10. Look in another statistics textbook to find out whether it uses a capital X bar or a lowercase x bar for sample mean. Be sure to indicate the textbook name and author.

11. (Bonus) The Hinkle textbook on page 11 carefully distinguishes between discrete versus continuous measurements. Is this description consistent with quantum mechanics where a particle's spin can only take on values of ±½hbar?

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