The sign of the product of –35 and –625 is (positive, negative, zero)
The sign of the product of 263 and 0 is (positive, negative, zero)
The sign of the product of –21 and 451 is (positive, negative, zero)
The sign of the product of –350 and 89 is (positive, negative, zero)

A. find the power of the test, when the null hypothesis assumes a population mean of mu = 450, with a population standard deviation of 156, the sample size is 5 and the true mean is 638.47 with confidence intervals of 95 b. find the power of the test, when the null hypothesis assumes a population mean of mu = 644, with a population standard deviation of 174, the sample size is 3 and the true mean is 744.04 with confidence intervals of 95% c. find the power of the test, when the null hypothesis assumes a population mean of mu = 510, with a population standard deviation of 126, the sample size is 10 and the true mean is 529.44 with confidence intervals of 95