Hey there,

please find attached my assignment which has 2 page in the same file

it is just 3 questions.

thank you.

1. Assuming a random sample of 50 observations from a population with a standard deviation of 25 and sample mean 100. a. Estimate the population mean with 90% confidence interval b. Repeat part a using a 95% confidence interval c. Repeat part a using 99% confidence interval d. What is the effect of changing confidence level? 2. A random sample of 25 was drawn from a normal distribution with a standard deviation of 5. The sample mean is 80. a. Determine the 95% confidence interval estimate of the population mean b. Repeat part a with a sample size 100 c. Repeat part a with a sample size 400 d. What is the effect of changing sample size. 5 and sample mean 100. e sample mean is 80. 1. Suppose a random sample of 200 rates of return on stocks was computed. Assuming the standard deviation of all return of return on all stocks with 90% confidence. Interpret the estimate Rate 9.75% 8.09% 13.22% 14.17% 9.91% 12.71% 13.95% 10.35% 8.60% 11.86% 13.59% 13.67% 12.76% 14.71% 10.68% 11.58% 10.73% 12.96% 13.54% 12.37% 11.14% 13.98% 13.45% 11.71% 11.78% 10.02% 12.32% 12.21% 12.22% 13.83% 7.70% 9.43% 13.76% 9.30% 10.01% 8.63% 10.41% 13.46% 14.13% 12.27% 14.38% 6.10% 9.83% 12.40% my email s.aljahani@hotmail.com 10.74% 13.55% 9.13% 13.97% 12.55% 13.22% 10.69% 10.67% 11.22% 14.00% 8.28% 8.68% 12.84% 13.02% 11.78% 10.73% 11.24% 13.63% 12.78% 10.75% 13.81% 11.00% 11.70% 13.06% 10.63% 10.68% 11.40% 10.27% 7.96% 13.71% 13.75% 12.27% 12.79% 10.09% 12.78% 12.53% 15.70% 9.42% 11.15% 14.02% 13.64% 12.99% 9.95% 15.14% 12.30% 16.27% 12.03% 15.09% 14.04% 14.95% 14.57% 12.76% 11.52% 14.53% 11.94% 8.08% 10.66% 15.34% 13.53% 12.97% 13.36% 11.94% 14.19% 13.67% 10.59% 13.40% 15.09% 10.62% 14.09% 10.97% 13.34% 10.84% 11.49% 4.75% 15.38% 8.08% 9.69% 12.00% 8.03% 13.08% 13.31% 15.80% 11.43% 15.25% 14.03% 16.14% 8.16% 13.65% 11.11% 12.25% 16.02% 11.82% 10.95% 17.26% 9.03% 11.24% 13.70% 12.09% 11.74% 13.89% 14.39% 12.09% 13.54% 11.69% 11.92% 11.55% 14.57% 10.46% 7.87% 11.24% 12.32% 12.92% 11.30% 11.65% 12.41% 8.02% 10.98% 12.93% 10.68% 14.71% 14.67% 15.40% 17.11% 13.27% 14.56% 12.30% 13.86% 13.19% 16.39% 14.27% 12.34% 14.28% 7.37% 9.71% 16.18% 9.64% 9.28% 13.61% 12.00% 12.74% 8.59% 14.53% 10.34% 12.61% 9.36% 10.07% 10.54% 7.29% 8.39% 15.16% 13.40% 8.37% 10.36% 11.85% 12.46% 14.66% rd deviation of all returns is 2.1%, estimate the mean rate