H₀ in the Wilcoxon rank sum test is that the two population ____________________ are the same.

Construct a frequency distribution for the set of data below. Use four classes, beginning with "20 up to 30," then "30 up to 40," then "40 up to 50," and finally "50 up to 60."
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Martina's RRSP earns 12% compounded monthly and her goal is to accumulate $1,000,000 by making deposits of $4,100 at the end of every year. How many years will it take to reach her goal?

A) 24 years
B) 29 years
C) 33 years
D) 47 years
E) 125 years

Calculate the combined equivalent value of the scheduled payments on the indicated dates. The rate of return that money can earn is given in the fourth column. Assume that payments due in the past have not yet been made.