To estimate m, the mean salary of full professors at american colleges and universities, you obtain the salaries of a random sample of 400 full professors. the sample mean is x = $73,220 and the sample standard deviation is s = $4400. a 99% confidence interval for m is a) 73220 â± 11440. b) 73220 â± 572. c) 73220 â± 431. d) 73220 â± 28.6.

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step-by-step explanation:

16.80 times .20= 3.36

step-by-step explanation:

yx = 36

step-by-step explanation:

cos f = opposite side/ hypotenuse

cos f = yw / yx

we know cos f = 4/9 and yw =16

4/9 = 16/yx

multiply each side by yx

4/9 yx = 16/ yx * yx

4/9 yx = 16

multiply each side by 9/4

9/4 * 4/9 yx = 16 *9/4

yx = 36

15 / 2 = 7.5

100 / 7.5 = 13.