Question 7 of 12 1 Point Fill in the blanks: The percentage of shrinkage on drying is an important feature of plastic clays. Test specimens of a particular type of plastic clay showed an average shrinkage percentage of 18.4 and a standard deviation of 1.2. If the percent of shrinkage is to be estimated to within 0.2 with a confidence coefficient of 0.98, how many specimens should be tested