Graded Problem Set #3 - Done.docx - MTH 243 – PCC(Trude Name_Jin Situ GRADED PROBLEM SET#3 Answer each of the following questions completely When

Graded Problem Set #3 - Done.docx - MTH 243 – PCC(Trude...

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MTH 243 – PCC (Trude) Name:___________Jin Situ___ __________ GRADED PROBLEM SET #3 Answer each of the following questions completely. When possible to answer using a complete sentence and offering explanation, please do so. There are a total of 20 points possible in the assignment. 1. [6 pts] Chief financial officers of U.S. companies were surveyed about areas in which job applicants make mistakes. Here are the areas and the frequency of responses: interview (452); résumé (297); cover letter (141); reference checks (143); interview follow up (113); screening calls (85). a. Create a bar chart for this information. b. Create a pie chart for this information.
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MTH 243 – PCC (Trude) Name:___________Jin Situ___ __________ 2. [14 pts] Helmets and Injuries : The data in the accompanying table is based on data from “Helmet Use and Risk of Head Injuries in Alpine Skiers and Snowboarders,” by Sullheim, et al. Journal of the American Medical Association, Vol. 295, No. 8. Head Injuries Not Injured Wore Helmet 96 656 No Helmet 480 2330 a. What is the probability a randomly selected person has a head injury?
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Unformatted text preview: Total of head Injuries: 96+480=576 Has a head injury probability: 576/3562 ≈0.1617 There are 16.17% probability from selected person has a head injury. b. What is the probability a randomly selected person wore a helmet? Total of wore a helmet: 96+656=752 Wore a helmet probability: 752/3562 ≈0.2111 There are 21.11% probability from selected person wore a helmet. c. What is the probability a randomly selected person had a head injury or wore a helmet? Had a head injury or wore a helmet probability: 576 3562 + 752 3562-96 3562 ≈ 0.3459 There are 34.59% probability from selected person had a head injury or wore a helmet. d. What is the probability a randomly selected person did not wear a helmet and was not injured? Total of didn’t wear a helmet and was not injured probability: 2330/3562 ≈0.6541 MTH 243 – PCC (Trude) Name:___________Jin Situ___ __________ There are 65.41% probability from selected person did not wear a helmet and was not injured. e. Are the events for helmet use and head injury independent? Prove mathematically....
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