Proportion, p = 60 / 300 = 0.2 (Proportion of people who own a bicycle)
Significance level = 1 - 0.95 = 0.05
Critical z-vale at 0.05 alpha= Z= 1.96 (from the table)
Standard Error for p = SE =
SE =
SE = 0.02
Let Q = Z *
Q = 1.96*0.02
Q = 0.04
Lower Limit of Confidence Interval = p - Q = 0.2 - 0.04 = 0.16
Upper Limit of Confidence Interval = p + Q = 0.2 + 0.04 = 0.24
So, 95% confidence Interval: 0.16 < p < 0.24
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