Find the df for problem 1

Find the interval for problem 2

Find the interval for problem 3

Mia is interested in estimating how long it takes students at school to complete a maze she designed. She takes an SRS of 4 Interval students and records how long it takes each of them to complete the maze. She finds that their average is 39 seconds with a . standard deviation of 8.83 seconds. They Units Seconds work separately, so she is willing to assume independence. Assume all conditions are met. Construct a 95% confidence interval % for the mean time (in seconds) it takes t 3.182 students to complete this maze. Suppose a company that produces over 1,000 tins of tuna per day took an SRS of 20 | Interval tins from one day's production. The sample showed a mean of 99.8 g of tuna per tin with a standard deviation of 0.9 g, end text. The amounts were roughly symmetric with no Unit S grams outliers. Based on this sample, construct a 95% confidence interval for the mean amount of tuna (in grams) per tin from that day's production. 19 A quality control expert at a drink bottling factory took a random sample of 9 bottles from a production run of over 1,000 bottles and measured the amount of liquid in each bottle in the sample. The sample data were roughly symmetric with a mean of 505 ml and a standard deviation of 6 ml. Based on this sample, construct a 95% confidence interval for the mean amount of liquid per bottle (in ml) in this production run. df Interval |(500.39, 509.61)