A pharmaceutical company is testing a new drug to increase memorization ability.

Question

A pharmaceutical company is testing a new drug to increase memorization ability. It takes a sample of individuals and splits them randomly into two groups. After the drug regimen is completed, all members of the study are given a test for memorization ability with higher scores representing a better ability to memorize. You are presented a 90% confidence interval for the difference in population mean scores (with drug-without drug) of (-14.88, -0.58). What can you conclude from this interval? 1) We are 90% confident that the average memorization ability of those not on the drug is higher than those who are on the drug those on the drug compared to those not on the drug higher than those who are not on the drug 2) There is no significant difference between the average memorization abilities for 3) We are 90% confident that the average memorization ability of those on the drug is 4) we are 90% confident that the difference between the two sample means falls 9) We do not have enough information to make a conclusion within the interval.

Explanation / Answer

Correct answer: Option (1) we are 90% confidenct that the average memorization ability of those not on the drug is higher than those who are on the drug

correct answer: option (4) There is not significant difference between the average sales quantity before or after the ad campaign

8) correct answer: Option (2) 4.6961
Margin of error, E = 4.696137

9) Correct answer: Option (5) 1.149 and p-value 0.251
since
Alternative Hypothesis:
p not equal p(hyp)

Sample proportion: 0.7826087
Test Statistic, z: 1.1485
Critical z: ±1.9600
P-Value: 0.2508

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