Question

Describe examples of situations where you could appropriately use the following. Explain why the procedure is the correct one to use and identify the statistic to be used and explain why that is the correct choice. (I'M EXTREMELY STUCK AND NEED SOME HELP PLEASE)

1. Confidence interval for a proportion.
2. Confidence interval for a mean, unknown σ.   
3. Describe procedure for following and provide an example of the calculations: Sample size determination for 95% confidence level.

Answer 1

Answer from the given data, let, a) Confidence interval fos proportion (p): - " If sample size(n) is sufficiently large - ii) Let, ß. sample proportion. DP 25 o - P225 - 1) Assuming normality In this case "z- test for proportion is used (z-state) b) confidence interval for a mean, unknown when population Standard deviation c is unknown. then to test statistics will be used. c) sample size determination for 951. confidence Level: -> sample size determination is name of method by which the value of n sample size) can be determined by using margin of eroor and confidence limit.

- suppose, we have given margin of error value is 0.50 for past (13), then we can determine value of (n) by using below steps margin of error = I2d/25 0.5:11.96 (36) tot (1963 05 n. (196333 0.5 n = 138.29 (n = 138] the sample size need (138) for margin of extor (050)