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Rama09 [41]
3 years ago
5

Find the sample size, n, needed to estimate the percentage of adults who have consulted fortune tellers. Use a 0.02 margin of er

ror, use a confidence level of 98% and use results from a prior poll suggesting that 20% of adults have consulted fortune tellers.
Mathematics
1 answer:
Brrunno [24]3 years ago
3 0

Answer: 2172

Step-by-step explanation:

Formula to find the sample size n , if the prior estimate of the population proportion(p) is known:

n= p(1-p)(\dfrac{z^*}{E})^2 , where E=  margin of error and z* = Critical z-value.

Let p be the population proportion of adults have consulted fortune tellers.

As per given , we have

p= 0.20

E= 0.02

From z-table , the z-value corresponding to 98% confidence interval = z*=2.33

Then, the required sample size will be :

n= 0.20(1-0.20)(\dfrac{2.33}{0.02})^2

n= 0.20(0.80)(116.5)^2

n= 2171.56\approx2172

Hence, the required sample size = 2172

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