Mary opened a savings account with a deposit of $18,000.
1 answer:
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Solution:
Required margin of error = 0.05
Estimated population proportion p = 0.8
Significance level = 0.10
The p is 0.8
The significance level, α = 0.1 is , which is obtained by looking into a standard normal probability table.
The number of patients surveyed to estimate the population proportion p within the required margin of error :
= 173.15
Therefore, the number of patients surveyed to satisfy the condition is n ≥ 173.15 and it must be an integer number.
Thus we conclude that the number of patients surveyed so the margin of error of 90% confidence interval is within 0.05 are n= 174.