LA rainfall The Los Angeles Almanac website reportsrecent annual rainfall (in inches), as shown in the table.a) Create a 90% confidence interval for the mean annualrainfall in LA.b) If you wanted to estimate the mean annual rainfallwith a margin of error of only 2 inches, how manyyears’ data would you need?c) Do these data suggest any change in annual rainfallas time passes? Check for an association betweenrainfall and year. Year Rain (in.) Year Rain (in.)1980 8.96 1991 21.001981 10.71 1992 27.361982 31.28 1993 8.141983 10.43 1994 24.351984 12.82 1995 12.461985 17.86 1996 12.401986 7.66 1997 31.011987 12.48 1998 9.091988 8.08 1999 11.571989 7.35 2000 17.941990 11.99 2001 4.42

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Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.