Q4: Please answer/ show steps.

Question 4 0/1 pt 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 16 shift registers, and you record the following shut- down temperatures. Construct a 90% confidence interval for the overall mean shutdown-temperature. 175.27 174.52 174.73 174.93 175.26 174.82 175.16 174.79 175.15 175.56 175.23 174.43 174.82 174.38 175.32 174.62 (Checksum: 2798.99) es a) Find the critical value and Of . Critical Value: b) Find the confidence interval