Apharmaceutical company makne tranquilizers that an elaimed to have amean effective period of 2.8 hr. researchers in a hospital used the drug on a random sample of 81 patients and found the mean effective period to be 2.5 hr with a standard deviation of 0.4 hr. does this indicate that the company's claim is too high? (use a 1% level of significance.) ao: has (et decision interpetdian 4

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step-by-step explanation: g=6

the figures below are made out of circles, semicircles, quarter … find the area and the perimeter of each figure and give your answers as a completely simplified exact value in terms of π (no approximations). remember that we'll also have to cut whatever areas we get in half, since we're only dealing

step-by-step explanation:

x + 4/7

step-by-step explanation:

use cymath

is there a picture

step-by-step explanation: