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Chrome File Edit View History Bookmarks People Tab Window Help 60% Wed Jul 29 6:44 PM Home: S2020STAT205L01:0 x You are scree
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Answer #1

TRADITIONAL METHOD
given that,
possible chances (x)=84
sample size(n)=194
success rate ( p )= x/n = 0.433
I.
sample proportion = 0.433
standard error = Sqrt ( (0.433*0.567) /194) )
= 0.0356
II.
margin of error = Z a/2 * (standard error)
where,
Za/2 = Z-table value
level of significance, α = 0.06
from standard normal table, two tailed z α/2 =1.881
margin of error = 1.881 * 0.0356
= 0.0669
III.
CI = [ p ± margin of error ]
confidence interval = [0.433 ± 0.0669]
= [ 0.3661 , 0.4999]
-----------------------------------------------------------------------------------------------
DIRECT METHOD
given that,
possible chances (x)=84
sample size(n)=194
success rate ( p )= x/n = 0.433
CI = confidence interval
confidence interval = [ 0.433 ± 1.881 * Sqrt ( (0.433*0.567) /194) ) ]
= [0.433 - 1.881 * Sqrt ( (0.433*0.567) /194) , 0.433 + 1.881 * Sqrt ( (0.433*0.567) /194) ]
= [0.3661 , 0.4999]
-----------------------------------------------------------------------------------------------
interpretations:
1. We are 94% sure that the interval [ 0.3661 , 0.4999] contains the true population proportion
2. If a large number of samples are collected, and a confidence interval is created
for each sample, 94% of these intervals will contains the true population proportion
a.
proportion pf sampled players who are canadian = 0.433
b.
multiplier in the confidence interval is z α/2 =1.881
c.
94% sure that the interval [ 0.3661 , 0.4999]
d.
interpretations:
1. We are 94% sure that the interval [ 0.3661 , 0.4999] contains the true population proportion
2. If a large number of samples are collected, and a confidence interval is created
for each sample, 94% of these intervals will contains the true population proportion

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