Solution :
=> Answer :- The confidence interval is (0.625 , 0.803)
Given that x = 50, n = 70
=> proportion p = x/n
= 50/70
= 0.7143
= 0.714 (rounded)
=> q = 1 - p = 0.286
=> for 90% confidence interval, Z = 1.645
=> A 90% confidence interval of the population proportion is
=> p +/- Z*sqrt(p*q/n)
=> 0.714 +/- 1.645*sqrt(0.714*0.286/70)
=> (0.6252 , 0.8028)
=> (0.625 , 0.803) (rounded)
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Solution :
Given that n = 246, x = 105
(a)
=> The point estimate for the proportion of cell phone owners
aged 18 - 24 who have an android phone is
=> p = x/n
= 105/246
= 0.4268
= 0.427 (rounded)
Use the given data to construct a 90% confidence interval for the population proportion p. x=50,...
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