Could someone please assist me with the following? thanks!

Show Intro/Instructions Constructing a Confidence Interval for a Population Mean Assume that a sample is used to estimate a population mean /. Find the 95% confidence interval for a sample of size 25 with a mean of 83.9 and a standard deviation of 16.3. Round your answers to two decimal places.Constructing a Confidence Interval for a Population Mean Assume that a sample is used to estimate a population mean /. Find the 95% confidence interval for a sample of size 10 with a mean of 72.1 and a standard deviation of 8.3. Round your answers to two decimal places.Constructing a Confidence Interval for a Population Mean In a survey, 28 people were asked how much they spent on their child's last birthday gift. The results were roughly bell- shaped with a mean of $30 and standard deviation of $10. Construct a confidence interval at a 90% confidence level. Give your answers to one decimal place. Enter the confidence interval in the form: Sample Mean + Margin of ErrorConstructing a Confidence Interval for a Population Mean You intend to estimate a population mean / with the following sample. 11 13 11 18 11 18 13 18 14 16 11 14 You believe the population is normally distributed. Find the 95% confidence interval for the population mean. Enter your answer as an open-interval (i. e., parentheses) accurate to two decimal places. 95% C.I. =