1. 

Samples of both surface soil and subsoil were taken from nine randomly selected agricultural locations in a particular county. The samples were analyzed to determine both surface soil pH and subsoil pl with the results shown in the following tables Surface soil 6.22 5.68 6.43 6.18 5.92 6.17 5.59 6.01 5.98 PH Subsoil pH 5.88 6.18 6.01 6.10 5.91 5.80 6.14 5.95 6. 78 Construct a 98% confidence interval for the true standard deviation for surface soil pH reading (10 marks)