Suppose that the mean of a random variable X is unknown but the variance for X is known to be 120. Should we reject the null hypothesis 0: = 20
in favor of alternative hypothesis 1: ≠ 20 at 5% level of significance, if a random
sample of 70 observations yields mean 15.

Answer asap ! the shortest path from point a to point b goes through a pond. to avoid the pond, you must walk straight 34 meters along one edge of the pond, then take a 90 degree turn, and again walk straight 41 meters along another edge of the pond to reach point b. about how many meters would be saved if it were possible to walk through the pond? a. 11 m b. 20 m c. 30.45 m d. 21.73 m

The general form of the quetion of a circle is ax^2+by^2+cx+dy+e=0 where a=b=0 if the circle has a radius of three units and the center lies on the y axis which set of values of a, b, c, d, and e might correspond to the circle

Given that ot =5, xt=12, and ox= 13 is xy tangent to circle o at t? explain.