The base of a cube is parallel to the horizon. if the cube is cut by a plane to form a cross section, under what circumstance can the cross section be a non-rectangular parallelogram?

The border line of the linear inequality 4x + 7y < 5 is dotted true or false?

Determine if this is a solution to the system

Arandom sample of 15 observations is used to estimate the population mean. the sample mean and the standard deviation are calculated as 172 and 63, respectively. assume that the population is normally distributed. a. with 99 confidence, what is the margin of error for the estimation of the population mean? b. construct the 99% confidence interval for the population mean. c. construct the 95% confidence interval for the population mean. d. construct the 83% confidence interval for the population mean. hint: you need to use excel function =t.inv.2t to find the value of t for the interval calculation.