Statistics exercises help - point estimate, confidence interval, etc.? (table of monthly profits)

Herondaleheir

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Apr 1, 2019
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I'm given a table of monthly profits in the pic below and I'm asked to solve the following questions but I'm struggling to figure out how and was wondering if someone could walk me through them? Some steps would be appreciated because I'm awful at math and often get lost trying to understand solutions.

a. Find a point estimate for the difference in the average monthly profits of these two phone companies.

b. What is the margin of error for a 99% confidence interval for the difference in the average monthly profits of these two phone companies?

c. Based on the constructed 99% confidence interval in part b, can we conclude that there is a difference in the average monthly profits of these two phone companies?

d. Given the level of significance α = 1%, test whether Bell's average monthly profit is more than Rogers'.

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