(A) An architect estimates that the average height of the buildings of 30 or more stories in Suva is at least 500 feet. A random sample of 12 buildings is selected, and the heights in feet are shown. At =0.025, is there enough Evidence to reject the claim?
634 385 411 741 625 515
345 420 435 535 516 482
(B)A survey by Men’s Health magazine stated that 40% of men said they used alcohol to reduce stress. At 0.10,test the claim that a random sample of 100 men was selected and 30 said that they used alcohol to reduce stress. Use the P-value method
(A) Find the mean first = sum of scores/number of scores
Subtract each of the scores from the mean and square each difference. Find the sum of these squares. Divide that by the number of scores to get variance.
Standard deviation = square root of variance
Z = (score-mean)/SEm
SEm = SD/√n
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability related to the Z score. How does it relate to .025?
I'll let you do the calculations.