Chapter 2 Lab(1) edited

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Feb 20, 2024

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MAT 157 Ch 2 lab Statistics In-Class Unit 1, Chapter 2 Lab Please type your answers directly on this document in RED . Part 1: Case Studies Use the packet of case studies provided (Exercise 4, 5, and 8) for the following. Case Study: Exercise 4: 1. Determine the level of measurement of the data in Table 1. i/r 2. Would the data be (select the best answer): a. Quantative/numeric, continuous b. Quantative/numeric, discrete :Because the table uses only uses discrete whole numbers c. Qualitative/categorical d. Can’t be determined e. None of the above 1. Which types of charts/graphs that were discussed in the text would be appropriate to make for the data in Table 1? Histogram, Dotplot , frequency distribution 3. At the time of the study, what percentage of the subjects had been using opiates for 10 years? 7.8% 4. At the time of the study, which current years of use category has the largest percentage? Why might this information be misleading when considering the rest of the data/table? 16-20 years Mainly because this is a 5 year window of time 5. At the time of the study, how many addicts had been abstinent for less than one week? 81 6. 7. Take the information from current years of use in Table 1 and create a new frequency table and relative frequency table (they can be joined) that has a class width of five. Indicate each of the following values for the second class in your table: a. Lower class limit: 6 1 | P a g e Years Frequency Relative Frequency 1-5 94 31% 6-10 102 33% 11-15 26 8% 16-20 57 19% 20+ 27 9% together 306 100%

MAT 157 Ch 2 lab b. Upper class limit: 10 c. Class boundaries: 5.5 d. Class midpoint: 10.5 e. Class width: 5 8. Look at the values for the duration of abstinence. What does the trend suggest about abstaining from opiates? The trends suggest that abstaining from opiates on a long term basis is very difficult for an opiate -addicted individual but on a short term basis it is fairly simple 9. Does the data in the duration of abstinence seem to be normally distributed? Explain. It does not appear to be normally distributed because the large percentage at the beginning of the chart labeled “no abstinence” Case Study: Exercise 5: 1. Which types of charts/graphs that were discussed in the text would be appropriate to make for the data presented? Frequency distribution, Dot plot , Histogram 2. Extend the table (write directly on your paper if you want to) to create a relative frequency distribution and a cumulative frequency distribution. #of customers observed over limit Relative frequency 0 .07 1 .12 2 .21 3 .25 4 .18 5 .09 6 or more .09 # of customers with fewer items Cum. Freq. 0 .07 1 or less .19 2 or less .4 3 or less .65 4 or less .83 2 | P a g e

MAT 157 Ch 2 lab 5 or less .92 6 or more fewer 1.01 3. What does the original table, the frequency and the relative frequency/cumulative frequency table suggest about this supermarket’s express lane violations? Do you think this is applicable to all supermarkets? Explain. It seems to me that these tables are normally distributed I am thinking that this could possibly be connected but there is not a for sure way to know unless more studies are ran. And observe in different settings and times 4. Suppose you were to obtain funding to conduct a similar study to see if the results are typical of suburban city supermarkets. What do you think should be done in the new study to help ensure that your results are representative of all suburban city supermarkets? I think repeating this study in multiple super markets in the suburban area would. Be a start to obtain more accurate info and in different times and settings 5. Does the data seem to be normally distributed? Explain. Yes the data is normally distributed because the frequency goes up to a maximum goes back. down 6. Based off the original data in the table, indicate ALL types of graphs/charts that would be appropriate to make (you do not need to make the graphs/charts) Histograms , dot plot , histogram , frequency, relative frequency , cumulative frequency, polygon frequency 7. Based off the original data in the table, indicate ALL types of graphs/charts that would be inappropriate to make. Stem and leaf, time series, pareto , pie chart, bar chart 3 | P a g e

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