TOPIC: Sampling distribution of sample mean Read and analyze the following problems and show the complete solution. 1. A study of 40 SHS English teachers established that they spent 12.6 minutes revising a student's term paper. 2. Find the 90% confidence interval in the mean time for all composition papers when minutes. 3. If the teacher affirmed that she spent an average of 30 minutes revising a term paper, what would be your reaction? 4. Find the sample size to estimate a population mean within 95% confidence if the standard deviation is 6.2. 5.The prices for LED are listed: 22 500, 24 000, 21 500, 20 200, 20 600, 21 100, 210 000, 19 300, 25 000 and 22 500. Estimate the true mean of the data set with 90% confidence level. 4. Louie wants to estimate the average value of the lot in his town with 99% confidence interval. Use his random sample of 36 lots with an average value of Php251, 131.42 and a standard deviation of Php 1 321.467 to find the confidence interval. 6. A survey conducted for 200 students to determine if they need financial assistance in their studies, it found out that 168 of them needed this assistance. Find the 90% confidence interval for the population proportion of students needing loans or scholarships. THANKS IN ADVANCE, HOPE YOU CAN HELP ME OUT