what size sample should be obtained if the estimate is to be within 0.01 with a 95% confidence if my previous estimate of 0.32 ? And if I didn't use any previous estimates

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We wish to estimate what percent of adult residents in a certain county are parents. Out of 200 adult residents sampled, 110 had kids. Based on this, construct a 99% confidence interval for the proportion ππ of adult residents who are parents in this county.Give your answers as decimals, to three places. < ππ <

A sample of size n=77 is drawn from a population whose standard deviation is 0= 33. Part 1 of 2 (a) Find the margin of error for a 95% confidence interval for µ. Round the answer to at least three decimal places. The margin of error for a 95% confidence interval for µ is Part 2 of 2 (b) If the confidence level were 90%, would the margin of error be larger or smaller? (Choose one) ▼ because the confidence level is (Choose one) ▼

The mean diastolic blood pressure for a random sample of 50 people was 96 millimeters of mercury. If the standard deviation of individual blood pressure readings is known to be 8 millimeters of mercury, find a 95% confidence interval for the true mean diastolic blood pressure of all people.  Carry the intermediate computations to at least three decimal places. Round the answers to one decimal place.  (a)  What is the lower limit of the 95% confidence interval?   (b)  What is the upper limit of the 95% confidence interval?

find the 80% confidence interval estimate of the proportions between lincoln residents with college degrees, between 1960 and 2010 X1= 490    X2=12,000 N1= 3200 N2= 48,000 please do not use scientific calculator, i need to understand how to solve this with a TI-30XIIS calculator. thank you