Below is a printout of a confidence interval estimate for the proportion of the clients who are female using the 108 data points. Do a sample of 20 data points. Use 20 random numbers that is below, to select the files.
|
Confidence Interval Estimate for the Mean
|
|
Data
|
|
Sample Size
|
108
|
|
Number of Successes
|
64
|
|
Confidence Level
|
95%
|
|
Intermediate Calculations
|
|
|
Sample Proportion
|
0.592592593
|
|
Z Value
|
-1.95996398
|
|
Standard Error of the Proportion
|
0.047280351
|
|
Interval Half Width
|
0.092667785
|
|
Confidence Interval
|
|
|
Interval Lower Limit
|
0.499924807
|
|
Interval Upper Limit
|
0.685260378
|
1. When would you use hypothesis testing and when would you use confidence intervals?
2. In news articles on surveys and polling, there usually is a statement on the margin of error. This is another term for the significance level. In few sentences describe one that you have seen either on TV or in newspapers or magazines.