ENGR.ECONOMIC ANALYSIS
ENGR.ECONOMIC ANALYSIS
14th Edition
ISBN: 9780190931919
Author: NEWNAN
Publisher: Oxford University Press
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2 The sample variance is _______.
a 8285.94    
b 9469.64    
c 10521.83    
d 11690.92    
Students in the population of all students taking E270 were asked to state how much they spent
on textbooks in the current semester.
Jse the following textbook expense data (in dollars) to answer the following 5 questions.
475
550
540
350
330
510
335
530
370
455
525
545
515
435
335
485
540
645
435
405
340
470
455
345
650
375
520
275
465
330
555
460
455
380
520
620
580
335
565
420
510
465
540
545
350
410
440
530
505
455
655
520
360
405
325
525
545
350
450
435
265
385
540
465
460
560
495
530
385
685
470
375
545
555
520
490
440
495
570
370
340
435
360
590
550
430
425
390
490
430
665
610
655
410
560
390
365
595
550
385
440
395
395
505
545
430
575
530
415
265
420
470
350
525
325
620
325
525
505
335
490
560
240
425
460
435
280
510
485
510
665
335
430
375
555
445
460
490
360
420
470
425
410
680
295
415
230
475
430
395
370
380
375
490
410
330
610
430
305
590
605
315
485
400
480
375
500
445
310
455
355
575
310
370
265
415
345
575
395
385
650
540
435
380
380
495
460
370
400
550
575
385
555
535
650
530
445
340
410
545
470
365
360
375
375
620
395
490
445
465
600
585
310
430
620
420
405
435
365
555
510
530
445
435
610
385
540
415
535
515
440
530
570
295
Arandom sample selected from the above population yielded the following data:
430
440
545
605
310
345
395
440
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Transcribed Image Text:Students in the population of all students taking E270 were asked to state how much they spent on textbooks in the current semester. Jse the following textbook expense data (in dollars) to answer the following 5 questions. 475 550 540 350 330 510 335 530 370 455 525 545 515 435 335 485 540 645 435 405 340 470 455 345 650 375 520 275 465 330 555 460 455 380 520 620 580 335 565 420 510 465 540 545 350 410 440 530 505 455 655 520 360 405 325 525 545 350 450 435 265 385 540 465 460 560 495 530 385 685 470 375 545 555 520 490 440 495 570 370 340 435 360 590 550 430 425 390 490 430 665 610 655 410 560 390 365 595 550 385 440 395 395 505 545 430 575 530 415 265 420 470 350 525 325 620 325 525 505 335 490 560 240 425 460 435 280 510 485 510 665 335 430 375 555 445 460 490 360 420 470 425 410 680 295 415 230 475 430 395 370 380 375 490 410 330 610 430 305 590 605 315 485 400 480 375 500 445 310 455 355 575 310 370 265 415 345 575 395 385 650 540 435 380 380 495 460 370 400 550 575 385 555 535 650 530 445 340 410 545 470 365 360 375 375 620 395 490 445 465 600 585 310 430 620 420 405 435 365 555 510 530 445 435 610 385 540 415 535 515 440 530 570 295 Arandom sample selected from the above population yielded the following data: 430 440 545 605 310 345 395 440
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