Statistics

Question 2: What is the difference among nominal, ordinal, interval and ratio level of measurement? How many ways can data be collected? What are key elements of a well-designed experiment?

Question 3: What is a frequency distribution? What is the difference between Histogram and Pareto chart?

Question 4: What is mean? Median? Mode? What role do mean and standard deviation play?

Question 5: What is the interquartile range (IQR) of a data set? What advantages and disadvantages may tree diagram and fundamental counting principle have?

Question 6: What is the difference between independent events and mutually exclusive events?

Question 7: What is the difference between permutations and combinations?

Question 8: Is it true that a discrete random variable can take only finitely many values? What is a binomial experiment?

Question 9: What is a normal distribution? How can you find area under a normal curve to the left of a given value? To the right? Between two values?

Question 10: Why do we consider sampling distribution?

Question 11: When will t-distribution be used to construct a confidence interval? 

Question 12: What distribution should be used for hypothesis test for the mean if population standard deviation is known?

Question 13: What distribution should be used for hypothesis test for the mean if population standard deviation is unknown?