statistics

You work for a company that produces electronics with integrated circuits. One of your products is called a "shift register." This product is designed to automatically shut down if its operating temperature exceeds 175 degrees Celsius. The manufacturing process has been designed to have a standard deviation of o = 0.4 degrees Celsius. You test a random sample 18 shift registers, and you record the following shut-down temperatures. Construct a 90% confidence interval for the overall mean shutdown-temperature. 174.22 175.08 174.49 174.67 174.99 174.62 174.94 174.67 174.67 175.02 175.25 174.81 175.45 175.05 174.26 174.79 175.05 175.08 (Checksum: 3147.11) a) Find the critical value and Of . Critical Value: b) Find the confidence interval