A production process is considered out of control if the produced parts have a mean length different from 27.5 mm or a standard deviation that is greater than 0.5 mm. A sample of 30 parts yields a sample mean of 27.63 mm and a sample standard deviation of 0.87 mm. If we assume part length is a normally distributed variable, does this sample indicate that the process should be adjusted to correct the standard deviation of the product? Use .
Answer to relevant QuestionsJulia Jackson operates a franchised restaurant that specializes in soft ice cream cones and sundaes. Recently she received a letter from corporate headquarters warning her that her shop is in danger of losing its franchise ...a. State two ways in which the standard normal distribution and Student’s t-distribution are alike. b. State two ways in which they are different. The National Highway Traffic Safety Administration found the U.S. average EMS response time from EMS notification to arrival at the crash scene in urban areas to be 6.85 minutes. A random sample of 20 reported fatal crashes ...Lunch breaks are often considered too short, and employees frequently develop a habit of “stretching” them.The manager at Giant Mart randomly identified 22 employees and observed the lengths of their lunch breaks (in ...Explain the relationship between the critical values found in the bottom row of Table 6 and the critical values of z given in Table 4A.
Post your question