Presidents also take midterms1 After two years of the president's term, members of Congress are up for election. The following table gives the number of net seats lost, by the party of the president, in the House of Representatives starting from Eisenhower's time.

For the data on the number of House seats lost:
(a) Calculate the sample mean.
(b) Calculate the standard deviation.
(c) Make a dot plot.
(d) What is one striking feature of these data that could be useful in predicting future midterm election results?

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Net House Seats Lost in Midterm Elections 1958 Eisenhower (R) 1962 Kennedy (D) Johnson (D) Nixon (R) Nixon/Ford (R) Carter (D) Reagan (R) Reagan (R) Bush (R) 1966 1970 1974 1978 1982 1986 1990 1994 1998 2002 2006 2014 Clinton (D) Clinton (D) Bush (R) Bush (R) Obama(D) 48 4 47 12 48 15 26 5 8 52 -5 (gain) -8 30 13