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CCE Proficience – 2020  Assignment 5 - Basics of Data Analytics  1

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CCE Proficience – 2020 
Assignment 5 - Basics of Data Analytics 
1. A survey of subscribers to Fortune magazine asked the following question: “How many of the last four issues have you read?” Suppose that the following frequency distribution summarizes 500 responses. a. What is the mean number of issues read by a Fortune subscriber? b. What is the standard deviation of the number of issues read? 
Number Read 0 1 2 3 4 Frequency 15 10 40 85 350 
2. DJIA and SP500 are both used to measure the performance of the stock market in USA. The following data show the daily percent increase or decrease in the DJIA and SP500 for a sample of 9 days. 
a. Show a scatter diagram for these data b. Compute and interpret the sample correlation coefficient. c. Do you need to check both to have a general idea about the daily stock market? 
DJIA 0.20 0.82 -0.99 0.04 -0.24 1.01 0.30 0.55 -0.25 SP500 0.24 0.19 -0.91 0.08 -0.33 0.87 0.36 0.83 -0.16 
3. A stereo and sound equipment store in San Francisco collected the data relating to the number of commercials shown over the weekend and the sales the store during the following week. Find out if there is any relationship between the commercials shown and the sales? 
Week 1 2 3 4 5 6 7 8 9 10 No of commercials 20 50 10 30 37 8 55 26 40 18 Sales volume ($100s) 50 57 41 54 54 38 63 48 59 46