DDT is a pesticide banned in Australia for its danger to humans and animals. In an experiment on the impact of DDT, six rats were exposed to DDT poisoning and six rats were not. For each rat in the experiment, a measurement of nerve sensitivity was recorded. The researchers suspected that the mean nerve sensitivity for rats exposed to DDT is greater than that for rats not poisoned. The following data was obtained:
Let 1 be the mean nerve sensitivity for rats poisoned with DDT. Let 2 be the mean nerve sensitivity for rats not poisoned with DDT.
Which of the following is a reasonable conclusion from an appropriate test of significance based on the data?

Question

DDT is a pesticide banned in Australia for its danger to humans and animals. In an experiment on the impact of DDT, six rats were exposed to DDT poisoning and six rats were not. For each rat in the experiment, a measurement of nerve sensitivity was recorded. The researchers suspected that the mean nerve sensitivity for rats exposed to DDT is greater than that for rats not poisoned. The following data was obtained:  
 Let 1 be the mean nerve sensitivity for rats poisoned with DDT. Let 2 be the mean nerve sensitivity for rats not poisoned with DDT. 
 Which of the following is a reasonable conclusion from an appropriate test of significance based on the data?

Accepted Answer

There is fairly strong evidence to support a conclusion that the mean nerve sensitivity is greater in rats exposed to DDT than in rats not exposed to DDT.

Answer

This test is unreliable because the populations sampled are heavily skewed.

Answer

There are outliers in these data, so we can't rely on the two-sample t test.

Answer

There isn't much evidence to support a conclusion that the mean nerve sensitivity is greater in rats exposed to DDT than in rats not exposed to DDT.

Poisoned rats:	12.207	16.869	25.050	22.429	8.456	20.589
Unpoisoned rats:	11.074	9.686	12.064	9.351	8.182	6.642

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DDT is a pesticide banned in Australia for its danger to humans and animals. In...

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