Question 11 of 12 lPoint ll in the blanks: The percentage of shrinkage on drying is an important feature of plastic clays. 45 test specimens of a particular type of plastic clay shovved an average shrinkage percentage of 18.4 and a standard deviation of 'I .2. Calculate the true average percent shrinkage for this type of specimen. within a 98% confidence interval or =( _ . I _) Express in the nearest hundredths