Question

2.In a sample of 180 adults, 155 had children. Construct a 90% confidence interval for the true population proportion of adults with children.

Give your answers as decimals, to three places

_____< p < _____

Answer 1

Total number of sample (n) = 180
number of favourable events (X) = 155

Sample size (n) = 180
Confidence interval(in %) = 90
z @ 90% = 1.645
Since we know that

Required confidence interval = (0.8611-0.0424, 0.8611+0.0424)
Required confidence interval = (0.8187, 0.9035)
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