# Homework Assignment #2

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HW assignment #1 Classify each of the following types of data for questions 1-3: 1) Ethnicity is a Qualitative variable (Nominative) 2) Length is a Quantitative variable. 3) Temperature (Celsius) is an Interval Variable 4) Make a Stem and Leaf plot from the following data 45, 50, 51, 110, 92, 71, 105, 56, 51, 62, 64, 77, 65, 55, 55, 59, 48, 73, 99, 116, 56 4 5 8 5 0 1 1 5 5 6 6 9 6 2 4 5 7 1 3 7 9 2 9 10 5 11 0 6 5) A manager of a car rental company took a random sample of 100 business days over the last fiscal year and recorded the number of cars rented per day. The frequency distribution for the data is given below. Interval Frequency RF CF CRF [20, 25) 4 .04 4 4/100 = .04 [25, 30) 11 .11 15 15/100 = .15 [30, 35) 23 .23 38 38/100 = .38 [35, 40) 31 .31 69 69/100 = .69 [40, 45) 15 .15 84 84/100 = .84 [45, 50) 10 .10 94 94/100 = .94 [50, 55) 6 .06 100 100/100 = 1 100 1 a) Calculate the Relative Frequency, Cumulative Frequency, and the Cumulative Relative Frequency. b) Draw a histogram and frequency polygon plot, and a relative frequency pie chart. c) What interval does the median number of car rentals per day fall into? 35,40 d) What percentage of business days had less than 30 car rentals? 15% e) How many business days had more than 45 car rentals? 10 6) Delta Airlines plans to make changes in its frequent-flier SkyMiles program. One of them is to discontinue discounts offered for passengers who choose to redeem award miles during off-peak periods. Before doing so, Delta wants to verify if this policy will discourage customers from flying during off-peak periods. The company made a list of