Two tailed t test for two companies' monthly profits
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I have a question revolving around two tailed tests, confidence intervals, etc, and I'm really struggling to figure out how to find the correct answers. For some reason I can't seem to properly wrap my mind around t-tests and two tail tests. Below you'll find the question and my attempt at some of the answers, which are probably way off. Monthly profits (in million dollars) of two phone companies were collected from the past five years (60 months) and some statistics are given in the following table. Company | Mean | SD Rogers | $123.7 | $25.5 Bell | $242.7 | $15.4 (a) Find a point estimate for the difference in the average