In the sample survey of 54 discount brokers that showed that the mean price charged for a trade of 100 shares at $50 per share was $33.77 (aaii journal, february 2006). the survey is conducted annually. with the historical data available, assume a known population standard deviation of $15. what the 95% confidence interval estimate of the population mean?

a. ucl = 52.94 lcl = 47.06

b. ucl = 36.71 lcl = 30.83

c. ucl = 50.54 lcl = 49.46

d. ucl = $37.77 lcl = $29.77

When constructing a perpendicular line through a point off a line, how can you verify that the lines constructed are perpendicular? check the angles used in the construction with a straightedge to ensure consistency. check the distance along the lines at several places with a compass to ensure they are the same length. check the intersecting lines with the corner of a piece of paper to ensure the lines create 90° angles. check the distance between the lines at several places with a compass to ensure they are equidistant. question 2(multiple choice worth 1 points) (01.03 lc) which of the following steps is included in the construction of a perpendicular line through a point on a line? connect arcs that are above and below the given line with a straightedge. connect arcs that are above the original line with a straightedge. create arcs on either side of a point that is off the given line. create a copied angle by using the first two lines as the original angle.