In: Statistics and Probability
A realtor studies the relationship between the size of a house (in square feet) and the property taxes (in $) owed by the owner. The table below shows a portion of the data for 20 homes in a suburb 60 miles outside of New York City. [You may find it useful to reference the t table.]
Property Taxes | Size |
21859 | 2454 |
17451 | 2442 |
18270 | 1886 |
15603 | 1089 |
43934 | 5673 |
33682 | 2503 |
15285 | 2285 |
16712 | 1984 |
18287 | 2014 |
16751 | 1380 |
15183 | 1354 |
36049 | 3002 |
31097 | 2845 |
42182 | 3333 |
14392 | 1541 |
38947 | 4084 |
25363 | 4032 |
22969 | 2402 |
16179 | 3512 |
29262 | 2830 |
a-1. Calculate the sample correlation coefficient rxy. (Round intermediate calculations to at least 4 decimal places and final answers to 4 decimal places.)
Property Taxes X | Size Y | X * Y | |||
21859 | 2454 | 53641986 | 477815881 | 6022116 | |
17451 | 2442 | 42615342 | 304537401 | 5963364 | |
18270 | 1886 | 34457220 | 333792900 | 3556996 | |
15603 | 1089 | 16991667 | 243453609 | 1185921 | |
43934 | 5673 | 249237582 | 1930196356 | 32182929 | |
33682 | 2503 | 84306046 | 1134477124 | 6265009 | |
15285 | 2285 | 34926225 | 233631225 | 5221225 | |
16712 | 1984 | 33156608 | 279290944 | 3936256 | |
18287 | 2014 | 36830018 | 334414369 | 4056196 | |
16751 | 1380 | 23116380 | 280596001 | 1904400 | |
15183 | 1354 | 20557782 | 230523489 | 1833316 | |
36049 | 3002 | 108219098 | 1299530401 | 9012004 | |
31097 | 2845 | 88470965 | 967023409 | 8094025 | |
42182 | 3333 | 140592606 | 1779321124 | 11108889 | |
14392 | 1541 | 22178072 | 207129664 | 2374681 | |
38947 | 4084 | 159059548 | 1516868809 | 16679056 | |
25363 | 4032 | 102263616 | 643281769 | 16257024 | |
22969 | 2402 | 55171538 | 527574961 | 5769604 | |
16179 | 3512 | 56820648 | 261760041 | 12334144 | |
29262 | 2830 | 82811460 | 856264644 | 8008900 | |
Total | 489457 | 52645 | 1445424407 | 13841484121 | 161766055 |
Sample correlation coefficient