Question 9 (1 point) A pharmaceutical company is testing a new drug to increase memorization ability. it takes a sample of individuais 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 (-0.37', 12.77). What can you conclude from this interval? 0 1) We are 90% confident that the average memorization ability of those on the drug is higher than those who are not on the drug. 0 2} There is no significant difference between the average memorization abilities ' for those on the drug compared to those not on the drug. 0 3) We are 90% confident that the difference between the two sample means falls within the interval. 0 4i We do not have enough information to make a conclusion. 0 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. Question 10 (1 point) The operations manager at a light bulb factory wants to determine whether there is any difference in the average life expectancy of bulbs manufactured on two different types of machines- A random sample of 55 light bulbs obtained from machine I indicates a sample mean of 353.27 hours and a sample of 55 from machine ll indicates a sample mean of 458.214 hours. The sample standard deviation of machine 1 is 71.86 hours and machine II is 133.?81 hours. She creates a 99% condence interval for the true difference in bulb lifetime to be (-158.635. 51.253]. Of those listed below. what is the best interpretation of this interval? 0 1) We are 99% confident that of the lightbulbs sampled. the difference in average lifetimes of bulbs made by machine I and machine [I is between 458.635 and -51.253. 2) We are certain that the average difference in bulb lifetime of all bulbs made by machine | and machine if is between 458.635 and 61.253 '3) We are 99% sure that the average difference in bulb lifetime of incandescent lightbulbs and LED lightbulbs is between 458.635 and -51.253. 0 4) We are 99% confident that the difference between the average lifetime of all bulbs made by machine i and machine II is between 458.635 and -51.253 5) We do not know the population means so we do not have enough information to make an interpretation