A researcher has been observing the local Republican Party in a large city and has compiled some information about a random sample of 40 party regulars. Data with regard to the number of years in the party for 40 party regulars are presented below. Descriptive results produced by SPSS are also presented below. 25 12 26 5 29 4 8 00 3 1 20 17 32 14 4 15 20 25 2144 50 10 25 30 25 17 40 15 9 15 7 176 14 15 25 21 1 2 Statistics number of years in the party N Valid 40 Missing 0 Mean 15.73 Std. Error of Mean 1.753 Median 14.50 Mode 25 Std. Deviation 11.087 Variance 122.922 Skewness Std. Error of Skewness .976 374 Kurtosis 1.040 Std. Error of Kurtosis .733 Percentiles 75 25.00 For every case, you can find a correspondent z score. What is the standard deviation of these z scores?