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The instructor takes a random sample of size from the population data and obtains the following sample data:
x |
405 |
385 |
495 |
385 |
555 |
470 |
7 | The variance of sample means is: | ||
a | 4784.17 | ||
b | 8085.10 | ||
c | 1347.52 | ||
d | 1418.44 |
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