Text messages have been a major source of revenue for cell phone carriers and for the first time in history the aver-age number of text messages per month decreased from the second to the third quarter of 2012. The Excel file text messages.xlsx lists the number of text messages sent last month from a sample of 70 cell phone customers. Using Excel, determine the range, variance, and standard deviation for this sample.
Answer to relevant QuestionsA company operates two retail outlets at different locations. The following table lists the customer satisfaction ratings on a scale of 1–10 for each location: Store 1 Store 2 7 ..... 8 4 ..... 7 6 ..... 10 3 ..... ...The Excel file labeled Customer service champs.xlsx lists the top 25 companies, with the best customer service scores ranked by Business Week in 2012. a. Determine the coefficient of variation. b. Calculate the z-score for ...The following data represent the number of customers per day that entered an AT& T wireless retail center in Orlando over a 30day period. a. Identify the first, second, and third quartiles. b. Determine the inter quartile ...Determine the following probabilities: a. P (A) b. P (B) c. P (C) d. P (D) e. P (E) A recent Wall Street Journal poll found that 70% of Americans felt the U. S. government was not working well. If seven people were randomly selected, what is the probability that all seven felt the government is not work-ing ...
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