Loading in 5 sec....

2.3 (cont.) Using the Mean and Standard Deviation TogetherPowerPoint Presentation

2.3 (cont.) Using the Mean and Standard Deviation Together

- 143 Views
- Uploaded on

Download Presentation
## PowerPoint Slideshow about '2.3 cont. Using the Mean and Standard Deviation Together' - blythe

**An Image/Link below is provided (as is) to download presentation**

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript

### Z-scores: Standardized Data Values weights displayed in this dotplot is

Example: textbook costs

286 291 307 308 315 316 327 328 340 342 346 347 348 348 349 354 355 355 360 361 364 367 369 371 373 377 380 381 382 385 385 387 390 390 397 398 409 409 410 418 422 424 425 426 428 433 434 437 440 480

Example: textbook costs (cont.)

286 291 307 308 315 316 327 328 340 342 346 347 348 348 349 354 355 355 360 361 364 367 369 371 373 377 380 381 382 385 385 387 390 390 397 398 409 409 410 418 422 424 425 426 428 433 434 437 440 480

Example: textbook costs (cont.)

286 291 307 308 315 316 327 328 340 342 346 347 348 348 349 354 355 355 360 361 364 367 369 371 373 377 380 381 382 385 385 387 390 390 397 398 409 409 410 418 422 424 425 426 428 433 434 437 440 480

Example: textbook costs (cont.) 286 291 307 308 315 316 327 328 340 342 346 347 348 348 349 354 355 355 360 361 364 367 369 371 373 377 380 381 382 385 385 387 390 390 397 398 409 409 410 418 422 424 425 426 428 433 434 437 440 480

The best estimate of the standard deviation of the men’s weights displayed in this dotplot is

- 10
- 15
- 20
- 40

7

Measures the distance of a number from the mean in units of the standard deviation

z-score corresponding to y weights displayed in this dotplot is

- Exam 1: y weights displayed in this dotplot is1 = 88, s1 = 6; exam 1 score: 91
Exam 2: y2 = 88, s2 = 10; exam 2 score: 92

Which score is better?

Comparing SAT and ACT Scores weights displayed in this dotplot is

- SAT Math: Eleanor’s score 680
SAT mean =500 sd=100

- ACT Math: Gerald’s score 27
ACT mean=18 sd=6

- Eleanor’s z-score: z=(680-500)/100=1.8
- Gerald’s z-score: z=(27-18)/6=1.5
- Eleanor’s score is better.

Z-scores add to zero weights displayed in this dotplot is

In 2007-08 the mean tuition at 4-yr public colleges/universities in the U.S. was $6185 with a standard deviation of $1804. In NC the mean tuition was $4320. What is NC’s z-score?

- 1.03
- -1.03
- 2.39
- 1865
- -1865

10

End of Section 2.3 colleges/universities in the U.S. was $6185 with a standard deviation of $1804. In NC the mean tuition was $4320. What is NC’s z-score?

Download Presentation

Connecting to Server..