Homework 1

Question 40 The following sample data represent the daily demand (y in thousands of units) and the unit price (x in dollars) for a product Unit Price (X) Daily Demand (Y) 1 30 4 34 7 40 3 33 5 38 What is the correlation coefficient of the two variables (Daily Demand and Unit Price)? O a. 0.8641 O b. 0.8591 O c. 0.7826 O d. 0.9783Question 31 During a cold winter, the temperature stayed below zero for ten days (ranging from -20 to -5). The variance of the temperatures of the ten day period: O a. Is negative since all the numbers are negative O b. Can be either negative or positive O c. Must be at least zero O d. Cannot be computed since all the numbers are negativeQuestion 34 The measure of dispersion that is influenced most by extreme values is: O a. The variance O b. The standard deviation O c. The range O d. The interquartile rangeQuestion 33 Which of the following is not a measure of variability? O a. Quartile O b. Standard deviation O c. Range O d. Interquartile range