Question

ely ran- lar size and age roups. One group p with drug of ge and treatments. Does d to 3 was -bacco Fected rone was 11.4 Fifteen juniper pythons of similar size were randomly assigned to 3 groups. One was treated with drug A, one group with B, and the third group was not treated. T systolic blood pressure was measured 24 h after administration of the treatments either drug affect blood pressure? Doe have more or less of an effect than the other? Drug A Drug B Untreated 118 105 130 120 110 135 125 98 132 119 106 128 121 105 130 Exercises 11.5 through 11.8 are appropriate for the 1. 1 TAL. 11. a by ne?

solve by using Anova on minitab
what is the P value of the residual plot?
what's the F value from the Anova?
which drug has the biggest impact on blood pressure?

Answer 1

Result:

Data are entered as two coloumns. one for group information and another for SBP values.

Group	SBP
Drug A	118
Drug A	120
Drug A	125
Drug A	119
Drug A	121
Drug B	105
Drug B	110
Drug B	98
Drug B	106
Drug B	105
Untreated	130
Untreated	135
Untreated	132
Untreated	128
Untreated	130

solve by using Anova on minitab
what is the P value of the residual plot?

After ANOVA,Onway, residuals are stored and Graph--Probability plot menu is used to get the graph.

Probability Plot of RESI Normal - 95% CI Mean StDev 1.705303E-14 3.071 AD P-Value 0.345 0.436 Percent TTTTTT FFF + H+ NFIT EHHHHEEE _LILILLL + 5 0 RESI

P value = 0.436.

what's the F value from the Anova?

One-way ANOVA: SBP versus Group

Method

Null hypothesis	All means are equal
Alternative hypothesis	Not all means are equal
Significance level	α = 0.05

Equal variances were assumed for the analysis.

Factor Information

Factor	Levels	Values
Group	3	Drug A, Drug B, Untreated

Analysis of Variance

Source	DF	Adj SS	Adj MS	F-Value	P-Value
Group	2	1740.4	870.20	79.11	0.000
Error	12	132.0	11.00
Total	14	1872.4

Model Summary

S	R-sq	R-sq(adj)	R-sq(pred)
3.31662	92.95%	91.78%	88.98%

Means

Group	N	Mean	StDev	95% CI
Drug A	5	120.60	2.70	(117.37, 123.83)
Drug B	5	104.80	4.32	(101.57, 108.03)
Untreated	5	131.00	2.65	(127.77, 134.23)

Pooled StDev = 3.31662

Tukey Pairwise Comparisons

Grouping Information Using the Tukey Method and 95% Confidence

Group	N	Mean	Grouping
Untreated	5	131.00	A
Drug A	5	120.60		B
Drug B	5	104.80			C

Means that do not share a letter are significantly different.

Tukey Simultaneous Tests for Differences of Means

Difference of Levels	Difference of Means	SE of Difference	95% CI	T-Value	Adjusted P-Value
Drug B - Drug A	-15.80	2.10	(-21.39, -10.21)	-7.53	0.000
Untreated - Drug A	10.40	2.10	(4.81, 15.99)	4.96	0.001
Untreated - Drug B	26.20	2.10	(20.61, 31.79)	12.49	0.000

Individual confidence level = 97.94%

F value from the Anova = 79.11

which drug has the biggest impact on blood pressure?

Group	N	Mean	StDev	95% CI
Drug A	5	120.60	2.70	(117.37, 123.83)
Drug B	5	104.80	4.32	(101.57, 108.03)
Untreated	5	131.00	2.65	(127.77, 134.23)

Mean value of Drug B is 104.80 and is lowest among the three groups. Drug B has the biggest impact on blood pressure.