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Statistics

The Los Angeles Almanac Web site reports recent annual rainfall (in inches), as shown in the table.

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

b) 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?

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

Year	Rain(in.)	Year	Rain(in.)
1980	8.96	1991	21.00
1981	10.71	1992	27.36
1982	31.28	1993	8.14
1983	10.43	1994	24.35
1984	12.82	1995	12.46
1985	17.86	1996	12.40
1986	7.66	1997	31.01
1987	12.48	1998	9.09
1988	8.08	1999	11.57
1989	7.35	2000	17.94
1990	11.99	2001	4.42

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Statistics and Probability, Statistics

Category:- Statistics and Probability
Reference No.:- M92236094

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