practice1ANS.pdf - Practice Exam 1 Answers...

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Practice Exam 1- Answers
2.The data shown in the scatter plot is the distance traveled and the airfare for 12 flights on Delta Airlines: a.Which of the following is a reasonable estimate of the correlation coefficient? (Circle one answer)
b.What does this graph tell us about distance and airfare
c.What is the type and level of distance traveled? Type (Circle One)
3.You have a 70% chance of being on time to class today and a 80% chance of being on time to class tomorrow. Assume these two days are independent events. a.Find the probability of being on time to class both today andtomorrow.
b.Find the probability of being on time to class at least once today ortomorrow.
4.The following data represent the daily births at a hospital for 20 days 14 15 15 17 17 19 19 21 26 27 31 35 36 47 48 59 a)Construct a stem and leaf diagram of the data 23 25 70 99 1 | 4 5 5 7 7 9 9 2 | 1 3 5 6 7 3 | 1 5 6 4 | 7 8 5 | 9 6| 7| 0 8| 9| 9 b)Calculate the interquartile range for this data set.
c)Calculate the median for this data set.
d)Without calculating, what can you say about the mean births for this Hospital.(check one answer below)?
5.The following data represents the hours per week worked outside of school by 200 randomly selected night students at a community college: HoursFrequencyRelative FreqC.R.Freq0-8 20 0.10 0.10 9-16 30 0.15 0.25 17-24 50 0.25 0.50 25-32 60 0.30 0.80 33-40 30 0.15 0.95 41-48 10 0.05 1.00 Total 200 1.00 a)In the space above, determine the relative frequencies and cumulative relative frequencies. b)Sketch a relative frequency histogram, showingallhorizontaland verticallabels. c)Sketch a cumulative relative frequency ogive, showingallhorizontaland verticallabels. d)Estimate the median from the graph.

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