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Use a confidence level of 90%, to find the positive critical value for a confidence interval to estimate a population mean when the population standard deviation is known. z= (Round to 3 decimal places.) Question Help: Video Message instructor Question 8 0/5 pts 399 Detail For a confidence level of 90% with a sample size of 27 , find the critical t value. t= (Round to 3 decimal places.) Question Help: Video Message instructor If n=23,x(xbar)=46, and s=7, find the margin of error at a 90% confidence level Give your answer to two decimal places. Question Help: Video Message instructor Question 11 0/5 pts 399 (i) Details You measure 39 watermelons' weights, and find they have a mean weight of 72 ounces. Assume the population standard deviation is 11.4 ounces. Based on this, what is the maximal margin of error associated with a 90% confidence interval for the true population mean watermelon weight. Give your answer as decimal, to two places ounces Question Help: Video Message instructor Question 12 0/5 pts O399 (D) Details You measure 27 randomly selected textbooks' weights, and find they have a mean weight of 36 ounces. Assume the population standard deviation is 8.9 ounces. Based on this, construct a 95% confidence interval for the true population mean textbook weight. Give your answers as decimals, to two places