8. In Chapter 4 of this study guide, you had the opportunity to determine the variability in employee satisfaction for a sample of 12 employees (N=12) from a particular company. The following data were given:X= 30,X²⁼ 350. Possible scores were between -10 and +10 with higher scores indicating greater satisfaction. Now, calculate a 98% confidence interval to estimate employee satisfaction for all employees in the company based on this sample of 12 and what is the interpretation of your findings.

9. In past chapters of this study guide, you had the opportunity to learn about the Clock Test and do some calculations related to it. Here is the description of the test again if you need it.The Clock Test is a technique for studying human vigilance. In the Clock Test, a hand moves regularly at one step per second, but sometimes, at random intervals, it jumps two steps. The participant's task is to notice the two-step jumps and press a button.

The statistics that follow are the percentages of two-step jumps that were missed by 100 participants (N=100) during the first 15 minutes and the last 15 minutes of a two-hour watch.

Statistics on Time of Test:

First 15 min of watch:Sample Mean (X-bar) = 12Sample Standard Deviation (s-hat)=3.54

Last 15 min of watch:Sample Mean (X-bar) =25Sample Standard Deviation (s-hat)=9.62

a. Calculate a 95% confidence interval about the mean for lapses during the first 15 minutes of a two-hour watch.

b. Calculate a 95% confidence interval about the mean for lapses during the last 15 minutes of a two-hour watch.

c.What is the interpretation of your findings.