1. The volumes of milk are sampled of 12 as follows: 154 , 149 , 156 , 148 , 151 , 157 , 156 , 141 , 150 , 150 , 147 , 155 , 154. The s.d is 4.1. Construct a 95% confidence interval for the mean volume of a standard glass. Also, what are we assuming is true about the distribution?
2. The heights of workers are normally distributed. A random sample o 25 is taken, and from which we get: Σx = 62.3 , Σx^2 = 111.1 . Construct a 99% confidence interval for the mean height.
