A study was done to determine the effect of the MECLR (methanol extract of C lut

Question

A study was done to determine the effect of the MECLR (methanol extract of C lutea) on the mating habits of rabbits.

Twenty male rabbits were randomly assigned to one of four groups:

Control: no MECLR or sildenafil citrate
40 mg/kg body weight of MECLR
80 mg/kg body weight of MECLR
0.5 mg/kg body weight of sildenafil citrate

The next day, each male was paired with a female rabbit, and the number of times the male tried to mount the female (“mounting frequency”) was recorded. The results are as follows:

Control rabbits: 2, 3, 3, 3, 3
40 mg/kg MECLR: 4, 5, 5, 5, 6
80 mg/kg MECLR: 6, 6, 7, 8, 8
0.5 mg/kg sildenafil: 8, 9, 11, 11, 11

Question:

If a researcher concludes that MECLR has an effect on mating behavior of rabbits, and it is later proven that MECLR has no effect on rabbits, what error did the researcher make?

A. The researcher made a Type I error but not a Type II error

B. The researcher made a Type II error but not a Type I error

C. The researcher made both a Type I error and a Type II error

D. The researcher did not make an error, based on the data available at the time

E. The researcher’s original error was Type I, but became a Type II error when the new information became available

Explanation / Answer

The researcher concludes that MECLR has an effect on mating behavior of rabbits, this means that he has rejected the null hypothesis which was later found out to be true. Hence,

The researcher has made Type I error.

Option A is correct.

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