Limit your attention to the most "recent" temperature data, (which we define as years 1990-2013), for New York City. Answer the following questions:

(A) For how many years during the recent period, did the annual temperature rise above the historical mean calculated for the entire period? Does this represent a reasonable, relatively large or relatively small percentage of the recent years?

(B) Of the 25 warmest years in recorded history, what percentage occurs during the recent period? Do you think the recent period has more or less than its fair share of warmer years? (Hint: It may help to re-sort the data according to temperature).

(C) Is the mean temperature for the recent period higher or lower than that of the entire period? Calculate the z-score for the recent mean based on the mean and standard deviation for the entire period. What does the value of the z-score tell you about the difference between the two means?

(D) Draw a Box Plot for the recent years and place it next to the Box Plot obtained from the data corresponding to the years prior to 1990. Are there any noteworthy differences between the two?

From (1990-20130 ) recent year

1970 53.2 W N H 1971 54.1 1972 53 1973 55.3 1974 54.2 1975 54.4 1976 52.8 8 1977 53.4 1978 52 10 1979 54.1 11 1980 53.6 12 1981 53.9 13 1982 53.5 14 1983 54.7 15 1984 54.1 16 1985 54.2 17 1986 54.2 18 1987 54.3 19 1988 54 20 1989 53.2Year NYC TEMP 1990 56.4 1991 564 Mean 55 32323 Year NYC TEMP 1990 56.4 1991 56.4 Mean Temp 55.33333 1992 53.1 1993 54.7 1994 54.4 1995 54.4 1996 53.7 1997 54.3 1998 57.1 1999 56.5 2000 53.8 2001 56.2 2002 56.4 2003 53.4 2004 54.5 2005 55.7 2006 56.8 2007 55 2008 55.3 2009 54 2010 56.7 2011 56.4 2012 57.3 2013 55.5