The floor plan of a ballroom is shown at right. the scale is 3 centimeters : 4 meters.

12cm
♒9 cm

1) what are the length and width of the ballroom
2) find the ballroom's area
3)show that the ratio of the areas is equal to the square of the ratio of the lengths.

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