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. One group is administered the drug, and the other is given a placebo. 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 (-8.63, 6.33). What can you conclude from this interval?

Question 8 options:

1)There is no significant difference between the average memorization abilities for those on the drug compared to those not on the drug.

2)We do not have enough information to make a conclusion.

3)We are 90% confident that the difference between the two sample means falls within the interval.

4)We are 90% confident that the average memorization ability of those on the drug is higher than those who are not on the drug.

5)We are 90% confident that the average memorization ability of those not on the drug is higher than those who are on the drug.