Which statements are true about the following regular polygon? Check all that apply. A polygon with 6 sides.
All of the interior angles are acute.
All of the interior angles are obtuse.
The sum of the interior angles is 720°.
The polygon can be divided into three triangles.
Each interior angle measures 120°.
The sum of two interior angles have the same measure as a straight angle.

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.