A web based software company is interested in estimating the proportion of individuals who use the Firefox browser. In a sample of 200 of individuals, 18 users stated that they used Firefox. Using...

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A web based software company is interested in estimating the proportion of individuals who use the Firefox browser. In a sample of 200 of individuals, 18 users stated that they used Firefox. Using this data, construct a 99% confidence interval for the proportion of all individuals that use Firefox.
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Answered Same DayDec 20, 2021

Answer To: A web based software company is interested in estimating the proportion of individuals who use the...

Robert answered on Dec 20 2021
127 Votes
99% Confidence Interval for p
p̂ = x
n
= 18200 = 9/100 = 0.09
Significance level = α = 1− confidence = 1 − 0.99 = 0.01
Critical z-value = zα/2 = z0.01/2 = z0.005 = 2.58 (closest value From z table)
Standard error of p̂ : SE =
√
p̂× (1 − p̂)
n
=
√
0.09 × 0.91
200 ≈ 0.020236
E = zα/2...
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