Has the number of times the House sits in each session of federal Parliament grown more variable? The overall standard deviation of days the House sits per Parliament is 188.3. But in a sample of nine Parliaments since World War II, the standard deviation of days the House sits per Parliament is 224.8 (based on data from Duration of Sessions of Parliament, Library of Parliament). Test, at the 0.05 level of significance, the claim that the standard deviation for the number of sittings per Parliament is no longer equal to 188.3.