A researcher drew a sample of 400 people, measured their IQs, and tested the null hypothesis that IQ = 100. The researcher obtained z = +3.00, which led her to reject the hypothesis (was 15.0). (a) What was the standard error of the mean?
(b) What was the mean of the sample?
(c) The test yielded a statistically significant outcome. Does it appear to be an important one? Explain.
(d) How much of a standard deviation did the discrepancy between X and hyp amount to?

14.3

step-by-step explanation:

add all the numbers together.

9 + 12 + 15 + 16 + 17 + 17 = 86

now, divide 86 by how many numbers we have: 6.

86 / 6 = 14.3

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step-by-step explanation:

first, you divide the triangle in two, tô form a retangle triangle. after, using pythagoream theorem:

18^2 = 14^2 + (x/2)^2

(x^2/4) + 196 = 324

x^2/4 = 324 - 196

x^2/4 = 128

x^2 = 512

x = √512

x = √2^9

x = 16√2 cm

i hope i you.

just get this app called photo math it should be able to do those