Use exact values for calculations and round final answers to 3 or 4 decimal places.

The built-in data set Loblolly is a data frame recording the growth of Loblolly pine trees. We are interested in the height column of Loblolly. Using R we can convert this column into the vector x by the assignment x 30 we can create a confidence interval for [4 using a normal critical value. If we want the condence interval to be at the 95% level and we use a normal critical value, then what critical value should we use.7 i) Calculate a 95% condence interval(using a normal critical value) for )4. ( I ) j) How long is the 95% condence interval just created in part