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Chapter 9: Q4BSC (page 414)

Robust What does it mean when we say that the F test described in this section is not robust against departures from normality?

Short Answer

Expert verified

The given statement means that the F test will not give the desired and accurate results if the populations from which the samples are extracted are not normally distributed, irrespective of the sample size.

Step by step solution

01

Given information

It is given that the F test is not robust against departures from normality.

02

Interpretation of the F-test not being robust

In statistics, robust means that a statistic works well for the given hypothesis test and produces a correct conclusion.

If the distribution of the test statistic is robust against departure from normality, it implies that the distribution is not very strict about the requirement of the population to be normally distributed and will produce accurate results even if the population is not normally distributed.

If the distribution of the test statistic is not robust against departure from normality, the distribution is very strict about the requirement of the population to be normally distributed and will not work well if the population is not normally distributed.

Therefore, the F test is not robust against departure from normality and will not give accurate results if the populations from which the samples are extracted are not normally distributed, irrespective of the sample size.

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Subject

A

B

C

D

E

F

G

H

I

J

K

L

Before

200

174

198

170

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182

193

209

185

155

169

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After

191

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177

167

159

151

176

183

159

145

146

177

Using Confidence Intervals

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Female

4.4

3.4

4.8

2.9

4.4

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3.5

3.7

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4.8

Male

4

3.6

4.1

4.1

3.5

4.6

4

4.3

4.5

4.3
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