| | Brand X | Brand Y | Brand Z |
| | 501 | 410 | 488 |
| | 475 | 398 | 467 |
| | 495 | 391 | 483 |
| | 490 | 412 | 484 |
| | 478 | 391 | 498 |
| | 493 | 404 | 491 |
| | 474 | 382 | 481 |
| | 481 | 411 | 502 |
| | 499 | 407 | 511 |
| | 499 | 430 | 524 |
| Sample Size (n) | 10 | 10 | 10 |
| Mean | 489 | 404 | 493 |
| Standard Deviation (s) | 10.54 | 13.70 | 16.40 |
| T - Distribution for Confidence Interval = 95% | 2.26 | 2.26 | 2.26 |
| Note**(Critical value based on sample size found in book) degrees of freedom | pg. 498 |
| | | Confidence Interval |
| x(mean) + (t *s)/sqrt(n) | 496.04 | 413.39 | 504.62 |
| x(mean) - (t *s)/sqrt(n) | 480.96 | 393.81 | 481.18 |
| | | Prediction Interval |
| x(mean) + t * sqrt(s^2 + s^2/n) | 513.49 | 436.08 | 531.78 |
| x(mean) - t * sqrt(s^2 + s^2/n) | 463.51 | 371.12 | 454.02 |
| | | | Male | Females | Total |
| | | Resigned | 22 | 12 | 34 |
| | | Remained | 686 | 144 | 830 |
| | (n) | Total | 708 | 156 | 864 |
| Confidence Interval for Proportion | | Resigned | 0.03107 | 0.07692 | 0.03935 |
| | | Remained | 0.96893 | 0.92308 | 0.96065 |
| Proportion Difference (p) | | | -0.93785 | -0.84615 | -0.92130 |
| Proportion Interval | | | Males (P1) | Females (P2) | Proportion (+) | Proportion (-) |
| p + 1.96*sqrt (p(1-p)/n) | | Resigned | | | -0.0449 | -0.0468 |
| p - 1.96*sqrt (p(1-p)/n) | | Remained | | | 0.0468 | 0.0449 |
| for homework assingment 9 find the non service contract number from the total and service contract numbers |
courseangel
510_week_10_classwork.xlsx
