Question

3.) today you took 16 randomly sampled widgets from your new production line (which makes thousands per day) and measured dimension x. You obtained a sample mean of 17.63 mm. You know from how long experience with your production process that the population standard deviation of x is 0.25 mm and the distribution of x is very close to norma. What is the 95% confidence interval for the population mean of x? You may either give a low & high pair of values or an expression involving :plus or minus) (+/-).

Answer 1