A pharmaceutical company is testing a new drug to increase memorization ability. It takes a sample of individuals and sp

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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 95% confidence interval
for the difference in population mean scores (with drug - without
drug) of (0.87, 13.58). What can you conclude from this
interval?
Question 8.A options:
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A restaurant wants to test a new in-store marketing scheme in a
small number of stores before rolling it out nationwide. The new ad
promotes a premium drink that they want to increase the sales of.
10 locations are chosen at random and the number of drinks sold are
recorded for 2 months before the new ad campaign and 2 months
after. The average difference in the sales quantity (after -
before) is -59.462 with a standard deviation of 44.9217. Calculate
a 90% confidence interval to estimate the true average difference
in nationwide sales quantity before the ad campaign and after.
Question 8.B options:
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5)