1 answer

I need some help on this question for my stats homework, any help is appreciated! Thank...

Question:

I need some help on this question for my stats homework, any help is appreciated! Thank you!

Question:

For 3 and 4, find the sample size needed to give the desired margin of error in estimating a population proportion with the i

For 3 and 4, find the sample size needed to give the desired margin of error in estimating a population proportion with the indicated level of confidence. 3. A margin of error within plus or minus 3% with 90% confidence. The sample proportion was 0.3.

Answers

Q.3)

Given that, margin of error ( E ) = 3% = 0.03

sample proportion = p = 0.3

A 90% confidence level has significance level = 0.10 and critical value is, a/2 1.645

We want to find, the sample size ( n ),

n = p * (1-p) * (za/2)2-0.3 * (1-0.3) * 0tJ)2 = 631.4058 0,03

n 632 (rounded to next whole number )

Therefore, required sample size is 632

Note: If you want sample size is nearest to interger the, n = 631

.

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