Find the minimum sample size needed to estimate the percentage of Democrats who have a sibling. Use a 0.1 margin of error, use a confidence level of 98%, and use the results from a prior Harris poll that gave a confidence interval of (0.44, 0.51) for the proportion of Democrats who have a sibling.

The minimum sample size is  

Step-by-step explanation:

From the question we are told that

   The confidence interval is

    The margin of error is  

Generally the sample  proportion can be mathematically evaluated as

Given that the confidence level is  98% then the level of significance can be mathematically evaluated as

Next we obtain the critical value of   from the normal distribution table  

   The value is

Generally the minimum sample size is evaluated as

sinn is the total amount of students now and m were the students before, you subtract them both (n-m) and divide that by m. then, since to get a percentage from a fraction you have to multiply by 100, your answer should look like this: n-m/m*100

step-by-step explanation: