A sample of 36 ten-year-old girls had a mean weight of 65 and a standard deviation of 12 pounds, respectively. Assuming normality, find the 90 percent confidence intervals for the population mean. Select one: O a. [ 57.775 , 73.225] O b. [ 59.62 , 71.38] O c. [61.01, 68.29] O d. [ 4.935 , 7.725] The simple linear regression equation between (x, y) is ly = -1.5x +15]. The value of y when x=3, is: Select one: O a. -10.5 O b. -1.5 O c. 10.5 O d. 15 For the data {10, 15, 20, 25, 30), which of the following will not change if 30 was replaced by 50? Select one: O a. The standard deviation O b. The mean O c. The median O d. The range