Qmb 3200 I\'m having a problem trying to see how they recieve part A in the ques

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Qmb 3200 I'm having a problem trying to see how they recieve part A in the question... When I did the problem (work below second picture) my answer is 0.575 and 0.724..Pearson's answer is below in the picture.. i'm off by 0.012 points and I believe I did the math correctly several times so I want to see how you do it, IF YOU CAN PLEASE PROVIDE EACH STEP, so I can see where I went wrong.

Edit View History Bookmarks Window Help ca89% Wed mathxl.com QMB 3200 RVF Fall 2017 Jenniffer Gonzalez 8/30/17 10:23 8.4 Calculating Confidence Intervals for Proportions Objective: Determine the margin of error for and

Explanation / Answer

a)

Normal approximation to the binomial calculation:

Standard error of the mean = SEM = x(N-x)/N3 = 0.038

= (1-CL)/2 = 0.025

Standard normal deviate for = Z = 1.960

Proportion of positive results = P = x/N = 0.637

Lower bound = P - (Z*SEM) = 0.563

Upper bound = P + (Z*SEM) = 0.712

Here, P = 0.637 not 0.65

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