1. Historically, the grade distribution on a final exam for a math class has been as follows: Historically, Across Department As Bs Cs Ds Fs 15% 20% 40% 15% 10% After implementing a new teaching method, the final exam grade distribution (in counts) for 300 students was as follows: As Bs Cs Ds Fs 60 50 130 40 20
Continuous Probability Distributions
Probability distributions are of two types, which are continuous probability distributions and discrete probability distributions. A continuous probability distribution contains an infinite number of values. For example, if time is infinite: you could count from 0 to a trillion seconds, billion seconds, so on indefinitely. A discrete probability distribution consists of only a countable set of possible values.
Normal Distribution
Suppose we had to design a bathroom weighing scale, how would we decide what should be the range of the weighing machine? Would we take the highest recorded human weight in history and use that as the upper limit for our weighing scale? This may not be a great idea as the sensitivity of the scale would get reduced if the range is too large. At the same time, if we keep the upper limit too low, it may not be usable for a large percentage of the population!
Does the new method appear to lead to a new grade distribution? Test at the 5% significance level. Also, is the new method better? Explain.
Trending now
This is a popular solution!
Step by step
Solved in 3 steps with 2 images
