19 Wanda listed these facts about parallelograms, - Opposite angles are equal to each other. • Adjacent sides may have different lengths. • There are exactly two sets of parallel sides, - Both pairs of opposite sides have the same leven which fact must also be true? in a rhombus, opposite angles are equal to each other. B in a rhombus, adjacent sides may have different lervius In a trapezoid, there are exactly two sets of parallel sides, D in a trapezoid, both pairs of opposite sides have the same length. ​

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.