1A) The proportions of defective parts produced by two machineswere compared, and the following data were collected. Determine a90% confidence interval for p1 -p2. (Give your answers correct to threedecimal places.)
| Machine 1: n = 151; number of defective parts =11 |
| Machine 2: n = 153; number of defective parts = 8 |
Lower Limit -
Upper Limit -
1B) Find the value of t for the difference between twomeans based on an assumption of normality and this informationabout two samples. (Use sample 1 - sample 2. Give youranswer correct to two decimal places.)
| Sample | Number | Mean | Std. Dev. |
| 1 | 24 | 37.8 | 13.3 |
| 2 | 23 | 44 | 10.3 |
