You want to develop a drug to increase IQ. So far, you have created 4 candidate

Question

You want to develop a drug to increase IQ. So far, you have created 4 candidate substances - A, B, C and D. They all shifted the group IQ mean (tested on 30 volunteers each) away from the population mean. You calculated the following parameters A: z-score of 2.5 B: Group mean = 115, SD = 15 C: Group mean = 130, SEM = 2 D: Group mean = 130, SEM = 4 Which of the 4 outcomes is most unlikely - and thus most promising to increase IQ?

A. Substance D

B. They are all equally (un)likely

C. Substance A

D. Substance B

E. Substance C

Explanation / Answer

Solution:- E. Substance C

A: z-score of 2.5

B: Group mean = 115, SD = 15

C: Group mean = 130, SEM = 2

D: Group mean = 130, SEM = 4

Out of the 4 outcomes Substance C is most unlikely beacuse the standard error of C is very less due to which the z-score will be very high as compared to any other Substance, therefore Substance C most promising to increase IQ.

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