You want to find out if the premiere of a new Marvel movie h…

You want to find out if the premiere of a new Marvel movie has an effect on the sales of Marvel comic books. When the newest movie was about to open, you went to seven comic book stores, and recorded their sales for Marvel comics. After the movie’s opening weekend, you went back to the same seven stores and recorded the sales of Marvel comics again. You recorded the sales in thousands of dollars in the table below. Determine the critical value for a test of significance at the 95% confidence level. Report the critical value to the third decimal place.

You work for Let’s Potato Chip Co., and have been assigned t…

You work for Let’s Potato Chip Co., and have been assigned to determine if the machine that fills the chip bags is working properly. Each bag is advertised to have 10.5 oz. of chips. You take 35 bags of Let’s Chips, and weigh the chips inside. You find a sample mean of 10.274 oz. and a standard deviation of 0.687 oz. State the conclusion of the test.

A forester at a logging company believes that the logging cr…

A forester at a logging company believes that the logging crews working under her are not loading the log trucks with the proper amount of timber when cutting. A fully loaded log truck weighs approximately 40 tons. After weighing 47 log trucks, the forester finds an average weight of 43.9 tons with a standard deviation of 4.1 tons. Find the upper boundary for the 99% confidence interval. Round your answer to the third decimal place.