Question: Alaskans and Canadians want to compare temperatures during a particularly cold week to see if Alaska was significantly colder than northern Canada during that week. The seven temperatures are:

Day 1 2 3 4 5 6 7

Alaska -30 -35 -41 -39 -28 -25 -20

Canada -27 -32 -36 -33 -27 -28 -26

a) Find the differences in temperatures

b) calculate the test statistic for the sign test

c) Find the p value for a one tailed test, using the normal table

d) Does the sign test indicate that Alaska was significantly colder than northern Canada during this particular week? Explain