Presidents also take midterms! 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 since the end of World War II.

Net House Seats Lost in Midterm Elections 1950 Truman (D) 55 1954 Eisenhower (R) 16 1962 Kennedy (D) 4 1966 Johnson (D) 47 1970 Nixon (R) 12 1974 Nixon/Ford (R) 43 1978 Carter (D) 11 1982 Reagan (R) 26 1986 Reagan (R) 5 1990 Bush (R) 8 1994 Clinton (D) 52 1998 Clinton (D) 5 (gain)

2002 Bush (R) 8 2006 Bush (R) 30 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? (Hint: Would you have expected more elections to result in net gains?)