Question

A forensic pathologist wants to know whether there is a difference between the rate of cooling of freshly killed bodies and those which were reheated, to determine whether you can detect an attempt to mislead a coroner about time of death. He tested several mice for their "cooling constant" both when the mouse was originally killed and then after the mouse was re-heated. Here are the results:

Mouse	Freshly killed	Reheated
1	573	481
2	482	343
3	377	383
4	390	380
5	535	454
6	414	425
7	438	393
8	410	435
9	418	422
10	368	346
11	445	443
12	383	342
13	391	378
14	410	402
15	433	400
16	405	360
17	340	373
18	328	373
19	400	412

Carry out the appropriate parametric statistical test to determine if there is any difference in the cooling constants between freshly killed and reheated corpses? Please provide me with copies of your INTERPRETED SPSS output and summarize the main results and conclusions in the space below Please note if pairing was valid as well as whether the means are significantly different from one another

1. Carry out the appropriate non-parametric test for the same data. What do you conclude from these tests and does it agree with the output of your parametric tests?

Answer 1

(Parametric test) The SPSS output is:

The p-value is 0.064.

Since the p-value (0.064) is greater than the significance level (0.05), we fail to reject the null hypothesis.

Therefore, we cannot conclude that there is a difference in the cooling constants between freshly killed and reheated corpses.

(Non-parametric test) The SPSS output is:

The p-value is 0.103.

Since the p-value (0.103) is greater than the significance level (0.05), we fail to reject the null hypothesis.

Therefore, we cannot conclude that there is a difference in the cooling constants between freshly killed and reheated corpses.

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