Please provide an example and explination fo the following:

a) Point estimates vs. interval estimates. Interpreting confidence intervals.

b) Calculating 95%, 90% and 99% confidence intervals for a population mean.

c) Calculating 95% confidence intervals for a population proportion.

d) How to calculate the necessary sample size for a desired level of precision in the context of a 95% CI for a population mean.

e) Understanding Standard Error and knowing that variation can be broken down into a
natural component and a measurement error component.

You can use any problem as an example, so long as it's described in detail. Definitions alone won't work for me, I need examples if you please!