efficiency experts study the processes used to manufacture items in order to make them as efficient as possible. one of the steps used to manufacture a metal clamp involves the drilling of three holes. suppose a simple random sample of 24 clamps has an average manufacturing time of 50.4 seconds with a standard deviation of 8 seconds and comes from a normal population. we are interested in the manufacturing time.a) what parameter are we estimating? select an answerb) we can work this problem because: select an answerc) what is the point estimate of that parameter? select an answerd) what is the standard deviation of the sampling distribution for the sample means? e) find the margin of error for a 90% confidence interval for the true average manufacturing time for the clamps. use your t-table to do this and round to the fourth f) round to the fourth. we are 90% confident that the true average manufacturing time for the clamps is between and .