## Confidence Interval for Proportions Test

Unit Test #78

Select your answers to the following 5 questions from the pop-up menus in the right hand column. Clicking the "Begin Test Again" button will clear all the answers.

 Q1: An apple grower finds that 40 out of 200 of his apples are too small for export. Find a 99% confidence interval for the proportion of fruit that is too small in his whole orchard. A. (0.17, 0.23) B. (0.16, 0.24) C. (0.14, 0.28) D. (0.13, 0.27) Answer 1: A                    B                    C                    D Q2: What would be the equivalent z-score for a confidence level of 86%? A. 1.476 B. 1.47 C. 0.1664 D. 1.664 Answer 2: A                    B                    C                    D Q3: Find a 86% confidence interval for the proportion of fruit that is too small in the orchard in question 1. A. (0.17, 0.23) B. (0.15, 0.25) C. (0.16, 0.24) D. (0.13, 0.27) Answer 3: A                    B                    C                    D Q4: A random survey carried out by a bank of their customers' bank accounts found that 134 out of 187 had overdrafts. What proportion is this, rounded to 3 significant figures? A. 0.715 B. 0.716 C. 0.717 D. 0.718 Answer 4: A                    B                    C                    D Q5: Find a 99% confidence interval for the proportion of overdrawn bank accounts at the bank in question 4. A. (0.635, 0.805) B. (0.684, 0.750) C. (0.685, 0.751) D. (0.632, 0.801) Answer 5: A                    B                    C                    D