Assume that the weights of chinook salmon in the columbia river are normally distributed. you randomly catch and weigh 40 such salmon. the mean weight from your sample is 23.6 pounds with a standard deviation of 3.5 pounds. test the claim that the mean weight of columbia river salmon is greater than 23 pounds. test this claim at the 0.10 significance level.
(a) what type of test is this? i) this is a right-tailed test. ii) this is a two-tailed test. iii) this is a left-tailed test.(b) what is the test statistic? round your answer to 2 decimal places.

Suppose there is a simple index of three stocks, stock abc, stock xyz, and stock qrs. stock abc opens on day 1 with 4000 shares at $3.15 per share. stock xyz opens on day 1 with 5000 shares at $4.30 per share. stock qrs opens on day 1 with 6000 shares at $4.60 per share. the price of stock abc on day 8 begins at $3.50. the price of stock xyz on day 8 begins at $3.90. stock qrs opens on day 8 with a price of $4.50 per share. assume that each stock has the same number of shares that it opened with on day 1. what is the rate of change of this simple index over 1 week?

Find the measure of the interior angles of the following regular polygons: a triangle, a quadrilateral, a pentagon, an octagon, a decagon, a 30-gon, a 50-gon, and a 100-gon.

Me, the vertices of quadrilateral coat are c(2,0), o(7,0), a(7,2) and t(2,2). prove that coat is a rectangle.