Question: LA rainfall 2018 The Los Angeles Almanac website reports recent annual rainfall (in inches), as shown in the table. 1. Create a 90% confidence interval

LA rainfall 2018 The Los Angeles Almanac website reports recent annual rainfall (in inches), as shown in the table.

1. Create a 90% confidence interval for the mean annual rainfall in LA.

2. If you wanted to estimate the mean annual rainfall with a margin of error of only 2 inches, how many years’ data would you need?

3. Do these data suggest any change in annual rainfall as time passes? Check for an association between rainfall and year.

4. Consider the residuals. If there are outliers, look them up (“Rainfall in Los Angeles in ####”). Comment.

Year Rain(in) 1991 11.47 1992 21 1993 27.36 1994 8.11 1995 24.35

Year Rain(in) 1991 11.47 1992 21 1993 27.36 1994 8.11 1995 24.35 1996 12.46 1997 12.4 1998 31.01 1999 9.09 2000 11.57 2001 17.94 2002 4.42 2003 16.49 2004 9.24 Year Rain(in) 2005: 37.25 2006 13.19 2007 3.21 2008 13.53 2009 9.08 2010 16.36 2011 20.2 2012 8.69 2013 5.85 2014 6.08 2015 8.52 2016 9.65 2017 19 2018 4.79

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