Transcript Applying ANOVA Using brute-force, Excel and Minitab to perform ANOVA

Applying ANOVA
Using brute-force, Excel and
Minitab to perform ANOVA
Warm-up
 Look
at the following applet from the IPS
website to remind you that ANOVA and Fscores investigate two sets of variances:
• Variances between data sets
• Variances within data sets
Example 12.21 (pg 786)
Time
Energy intake (kcal/d)
4 Months
5 months
6 Months


499
620
469
485
660
588
675
517
649
404
738
628
609
617
704
558
653
548
490
395
402
177
475
617
616
587
528
370
431
518
639
368
538
519
506
585
647
477
445
485
703
528
465
209
N1 = 19
518
N2 = 19
N3 = 8
Graph data – use boxplots if you have a stats
package
Prepare a table giving n, m and s for each
group
Boxplot of data
 Are
the means different?
Example 12.23 (pg 787)
Bone Density (mg/cm3)
Group
Control
611
621
614
593
593
653
600
554
603
569
Low Jump
635
605
638
594
599
632
631
588
607
596
High Jump
650
622
626
626
631
622
643
674
643
650