determine the lower and upper values of the error bar for the data set described below and compare to a given error bar. Use a 95 % confidence interval.

Given

XX = 8.55 cm

s = 3.88 cm

n = 1.0E1 (Unitless)

Question(s)

1. What is the Significance of the Confidence Interval used to calculate the Error Bar (as a fraction)?

(Unitless) (Answer Significant Figures = 3)

2. What probability will be used to calculate the Critical Value (i.e., is placed in tail of distribution)?

3. Calculate the Degrees of Freedom for the sample. Enter "NA" (i.e., not applicable) if the Test Statistic does not have Degrees of Freedom.

4. Calculate the Critical Value used to determine the Error Bar Limits. If the population standard deviation is unknown, use the T Distribution regardless of the sample size.

5. Calculate the Lower Limit of the Error Bar.

6. Calculate the Upper Limit of the Error Bar.

7. Compare your data set to one with a (95 % CI) error bar that stretches from 8 to 12. Based on the Error Bars, enter (1) if the means of the two data sets are different in a statistically significant way, (2) if they are not different in a significantly different way, or (3) if the error bars signify nothing.