M2022, 2:13 PM Question 5 Not yet an swered Marked out of 28.00 httpszlldaulm :2.d:u.eafmoodlelm ndlquizlallemplphphem pt= 347837acmid=24 24B28page=4 MGSC51DE-14 F'I'Ia] Exam (page 5 MB) Pa rt 1 Cape Breton University is accessed from Grand Lake Road, which is a busy highway that carries 40 000 cars per day, with a posted speed limit of 80 km/h. Below are vehicle speeds recorded in km/h by the RCMP in front of CBU during 15 minutes of surveillance - the police want to know if there is a chronic problem with speeding at this location. \\I U1 \\l U1 EDS] LJ'IO b) Does this data represent a population or a sample? a) How many observations were reported? c) How many modes are there? d) Indicate the mode: (any and all that apply) Pearson's Skewness (5k) Excel Skewne ss (SKEW) How symmetrically distributed is this data? Pa rt 2 In order for the police to decide whether or not to be concerned about this data, they want to develop a 90% confidence interval. Should a t or 2 distribution be used? 213 4/20/22, 2:13 PM MGSC-5108-14 Final Exam (page 5 of 6) Calculate the following: t or z value Margin of Error Lower limit Upper limit Based on this confidence interval, is it reasonable to say that the average driver: i) exceeds the speed limit at this location? ii) travels at over 90 km/h at this location? iii) might travel at 85 km/h at this location? iv) might travel at the speed limit at this location? Part 3 Consider the above to be a pilot study. If the police now want to conduct a larger study that is more precise (i.e. a higher level of confidence with a smaller margin of error), how large of a sample size do they need? Calculate the following to complete the table: Allowable Margin of Error 1 km/h (E) Level of 95% Confidence Standard Deviation What sample size (n) is required? Chapter 5,6,7,8 Quiz take- Course Evaluations Jump to... home - https://cbulms2.cbu.ca/moodle/mod/quiz/attempt.php?attempt=347837&cmid=242462&page=4 3/3