1 Point Question 7 A study hypothesised that the speed of fast bowlers differs between left- and right-handed bowlers. A sample of 12 left-handed bowlers had a mean *left = 131.5 kph and standard deviation sen = 15.5 kph, while a sample of 8 right-handed bowlers had a mean *right = 150.1 kph and standard deviation Sright = 8.1 kph. State appropriate null and alternative hypotheses. A Ho: Hleft = Wright HA: Hleft Hright B Hoi Heft = Wright HA: Hleft Wright Ho: Hien * Wright HA: Hleft Hright D Ho: Wleft = Wright HA: Hief - Wright >0A researcher goes and examines damage to the reef after a cyclone passes over it. This is A None of these. B a non-sampling error. C an experimental study. D an observational study