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CHAPTER 6

1. In the blank, write L for larger, or S for smaller.

If you keep the level of confidence constant, then lowering the sample size will make the margin of error ____

If you keep the sample size constant, then lowering the margin of error will give a ____ confidence level.

If you keep the margin of error constant, then raising the confidence level will necessitate a sample size which is _____

2. True/False

T F A margin of error representing two standard deviations is larger than one representing one standard deviation.

T F A margin of error representing two standard deviations gives a lower level of confidence than one representing one standard deviation.

3. Given a sample size of 10 and a level of confidence of .95, the margin of error Is ± 30. Suppose that 4 out of the 10 jellybeans you pick from a big bag of jellybeans are blue. Diagram this information on a rectangle like those in the book:













What conclusion should you draw about the % of blue jellybeans in the sample? (State it carefully.)

 

 

What conclusion can you draw about the % of blue jellybeans in the big bag? (State it carefully.)