Contents
- Preface
1Sampling and Data
- Introduction
- 1.1Definitions of Statistics, Probability, and Key Terms
- 1.2Data, Sampling, and Variation in Data and Sampling
- 1.3Frequency, Frequency Tables, and Levels of Measurement
- 1.4Experimental Design and Ethics
- 1.5Data Collection Experiment
- 1.6Sampling Experiment
- Key Terms
- Chapter Review
- Practice
- Homework
- Bringing It Together: Homework
- References
- Solutions
10Hypothesis Testing with Two Samples
- AAppendix A Review Exercises (Ch 3–13)
- BAppendix B Practice Tests (1–4) and Final Exams
- CData Sets
- DGroup and Partner Projects
- ESolution Sheets
- FMathematical Phrases, Symbols, and Formulas
- GNotes for the TI-83, 83+, 84, 84+ Calculators
- HTables
- Index
7.4
Central Limit Theorem (Pocket Change)
Stats Lab
Central Limit Theorem (Pocket Change)
Student Learning Outcome
- The student will demonstrate and compare properties of the central limit theorem.
Note
This lab works best when sampling from several classes and combining data.
Collect the Data
- Count the change in your pocket. (Do not include bills.)
- Randomly survey 30 classmates. Record the values of the change in Table 7.1.
__________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ Table 7.1 - Construct a histogram. Make five to six intervals. Sketch the graph using a ruler and pencil. Scale the axes.
Figure 7.10 - Calculate the following (n = 1, surveying one person at a time):
- = _______
- s = _______
- Draw a smooth curve through the tops of the bars of the histogram. Use one to two complete sentences to describe the general shape of the curve.
Collecting Averages of Pairs:Repeat steps one through five of the section Collect the Data with one exception. Instead of recording the change of 30 classmates, record the average change of 30 pairs.
- Randomly survey 30 pairs of classmates.
- Record the values of the average of their change in Table 7.2.
__________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ Table 7.2 - Construct a histogram. Scale the axes using the same scaling you used for the section titled Collect the Data. Sketch the graph using a ruler and a pencil.
Figure 7.11 - Calculate the following (n = 2, surveying two people at a time):
- = _______
- s = _______
- Draw a smooth curve through the tops of the bars of the histogram. Use one to two complete sentences to describe the general shape of the curve.
Collecting Averages of Groups of Five:Repeat steps one through five (of the section titled Collect the Data), with one exception. Instead of recording the change of 30 classmates, record the average change of 30 groups of five.
- Randomly survey 30 groups of five classmates.
- Record the values of the averages of their change.
__________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ __________ Table 7.3 - Construct a histogram. Scale the axes using the same scaling you used for the section titled Collect the Data. Sketch the graph using a ruler and a pencil.Figure 7.12
- Calculate the following (n = 5, surveying five people at a time):
- = _______
- s = _______
- Draw a smooth curve through the tops of the bars of the histogram. Use one to two complete sentences to describe the general shape of the curve.
Discussion Questions
- Why did the shape of the distribution of the data change, as n changed? Use one to two complete sentences to explain what happened.
- In the section titled Collect the Data, what was the approximate distribution of the data?
- X ~ _____(_____, _____)
- In the section titled Collecting Averages of Groups of Five, what was the approximate distribution of the averages? ~ _____(_____, _____)
- In one to two complete sentences, explain any differences in your answers to the previous two questions.