Question

please answer all the questions and explain and write clearly

You are interested in studying the neurological effects of dehydrogenated brominate oil, a food additive. You randomly select 25 Sprague-Dawley rats and add a dosage to their drinking water. Because the additive is odorless and colorless, the rats readily consume it. After six months you sacrifice the rats, microsection their brains and count the number of lesions in the hippocampus. 30mg 35mg 15mg 20mg 2 5mg 17S 12 15 7 17 1 8 15 10 1 8 111822 9 18 19 19 28 22 19 GO 17

what do you mean this is all the complete question I have there is nothing else

Answer 1

The Excel output is:

	Mean	n	Std. Dev
	11.8	5	4.15	15 mg
	15.0	5	3.74	20 mg
	18.4	5	2.51	25 mg
	21.0	5	4.30	30 mg
	11.6	5	2.70	35 mg
	15.6	25	4.97	Total
ANOVA table
Source	SS	df	MS	F	p-value
Treatment	338.96	4	84.740	6.69	.0014
Error	253.20	20	12.660
Total	592.16	24
Post hoc analysis
p-values for pairwise t-tests
		35 mg	15 mg	20 mg	25 mg	30 mg
		11.6	11.8	15.0	18.4	21.0
35 mg	11.6
15 mg	11.8	.9301
20 mg	15.0	.1465	.1704
25 mg	18.4	.0067	.0082	.1465
30 mg	21.0	.0005	.0006	.0148	.2616
Tukey simultaneous comparison t-values (d.f. = 20)
		35 mg	15 mg	20 mg	25 mg	30 mg
		11.6	11.8	15.0	18.4	21.0
35 mg	11.6
15 mg	11.8	0.09
20 mg	15.0	1.51	1.42
25 mg	18.4	3.02	2.93	1.51
30 mg	21.0	4.18	4.09	2.67	1.16
critical values for experimentwise error rate:
		0.05	2.99
		0.01	3.74

The plot is:

Comparison of Groups 15 mg 20 mg 25 mg 30 mg 35 mg

Yes, there is a significant difference.

Since the p-value (0.0014) is less than the significance level (0.05), we can reject the null hypothesis.

Therefore, we have sufficient evidence to conclude that there is a significant difference.

The post-hoc analysis shows that 25 mg and 35 mg is significant.

Therefore, food additives have different effects.

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