FOR THIS SET OF DATA: 1997 = 0.6, 1998 = 2.3, 1999 = 1.7, 2000 = 0.8, 2001 = 1.8, 2002 = 0.5, 2003 = 1, 2004 = 0, 2005 = 1.6, 2006 = 2.4, 2007 = 0.8, 2008 = 0.6, 2009 = 0.7, 2010 = 3, 2011 = 1.3, 2012 = 1.8, 2013 = 0.7, 2014 = 0.6, 2015 = 1.3, 2016 = 2.1, 2017 = 1.5, 2018 = 0.6, 2019 = 1.1, 2020 = 1.2, 2021 = 2.1. If it is normally distributed, calculate the standard deviation, and select a value for z-score calculation and confidence interval