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MATH 120 Statistics

Joshua Hernandez

Homework #1

Section 1.2

1. What is a voluntary response sample?

A sample in which the subjects decide whether to be included in the study.

2. Why is a voluntary response sample generally not suitable for statistical study?

This sample may have a bias resulting from subjects that have a special interest in the subject being studied.

3. What is the difference between statistical significance and practical significance?

Statistical significance is when methods used to reach a conclusion that some findings are effective but common sense may find that findings do not make enough difference to justify a use or to be practical.

6. In the study of the Weight Watchers weight loss program from Exercise #5, subjects were found using the method described as follows: “We recruited study candidates from the Greater Boston area using newspaper advertisement and television publicity.” Is the sample a voluntary response sample? Why or why not?

Yes the test subjects are a voluntary response sample because they volunteered to be part of the case study.

15. Refer to the table of nicotine amounts. Is each x value matched with a corresponding y value, as in Table 1-1 on page 5? That is, is each x value associated with the corresponding y value in some meaningful way? If the x and y values are not matched, does it make sense to use the difference between each x value and the y value that is in the same column?

The x and y values are not matched. Since this is true it will not work if you use the difference between each x value and y value that are in the same column.

16. The Federal Trade Commission obtained the measured amounts of nicotine in the table. Is the source of the data likely to be unbiased?

The FTC is a federal agency and will not profit from the results, because of this it is likely to be an

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