A random sample of 17 size AA batteries for toys yield a mean of 3.31 hours with standard deviation, 1.11 hours. (a) Find the critical value, t*, for a 99% CI. t* =

In each of the cases that follow, the magnitude of a vector is given along with the counterclockwise angle it makes with the +x axis. use trigonometry to find the x and y components of the vector. also, sketch each vector approximately to scale to see if your calculated answers seem reasonable. (a) 50.0 n at 60.0°, (b) 75 m/ s at 5π/ 6 rad, (c) 254 lb at 325°, (d) 69 km at 1.1π rad.