Select the correct statement. a.)
The critical z-score for a right-tailed test at an 18% significance level is 0.57.
b.)
The critical z-score for a two-sided test at an 18% significance level is 1.95.
c.)
The critical z-score for a left-tailed test at a 14% significance level is -1.08.
d.)
The critical z-score for a two-sided test at a 10% significance level is 1.23.

Ateacher attaches a ball to a meter long string and whirls it around in a horizontal circle at constant speed. the teacher explains that the string is what makes the ball go in a circle. why is the string necessary? a) the string is needed to apply a torque to the ball. b) the string is needed to push on the ball to get it up to speed. c) circle motion requires an inertia which is provided by the string. d) circle motion requires a force to give it a centripetal acceleratio