You have joined a ball bearing company making the small balls used in the assembly. You have sampled 50 balls and found the sample standard deviation to be 0.0057 mm. For the company to maintain the process capability on this operation the standard deviation of the balls can be no more than 0.0050 mm. You are going to use hypothesis testing to see if you have exceeded the level of 0.0050 mm. Use alpha equal to 0.05. What is the null hypothesis?
