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Louisiana State University *

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4048

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Statistics

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Feb 20, 2024

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pdf

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Uploaded by LieutenantElectronPigeon31

2/11/24, 12:25 PM 1.1.3: Chi-Square - Goodness-of-Fit (Worksheet) - Statistics LibreTexts 1.1.3: Chi-Square - Goodness-of-Fit (Worksheet) Name: Section; Student ID#: Work in groups on these problems. You should try to answer the questions without referring to your textbook. If you get stuck, try asking another group for help. Student Learning Outcome e The student will evaluate data collected to determine if they fit either the uniform or exponential distributions. Collect the Data Go to your local supermarket. Ask 30 people as they leave for the total amount on their grocery receipts. (Or, ask three cashiers for the last ten amounts. Be sure to include the express lane, if it is open.) [ You may need to combine two categories so that each cell has an expected value of at least five. ] a. Record the values. b. Construct a histogram of the data. Make five to six intervals. Sketch the graph using a ruler and pencil. Scale the axes. Relative frequency Amount of receipt Figure 11.8.1. c. Calculate the following: iz = 113: 2: 1ii. s Uniform Distribution Test to see if grocery receipts follow the uniform distribution. a. Using your lowest and highest values, X ~ U( , ) b. Divide the distribution into fifths. c. Calculate the following: https://stats.libretexts.org/Learning_Objects/Worksheets-_Introductory_ Statistics/1.1.03%3A_Chi-Square_- Goodness-of-Fit_(Worksheet) 1/3

2/11/24, 12:25 PM 1.1.3: Chi-Square - Goodness-of-Fit (Worksheet) - Statistics LibreTexts i. lowest value = ii. 20t percentile = iii. 40™ percentile = iv. 60% percentile = v. 80" percentile = vi. highest value = d. For each fifth, count the observed number of receipts and record it. Then determine the expected number of receipts and record that. Fifth Observed Expected 1St 5th e. Hy: f. H,: g. What distribution should you use for a hypothesis test? h. Why did you choose this distribution? i. Calculate the test statistic. j- Find the p-value. k. Sketch a graph of the situation. Label and scale the x-axis. Shade the area corresponding to the p-value. Figure 11.6.2. ]. State your decision. m. State your conclusion in a complete sentence. Exponential Distribution Test to see if grocery receipts follow the exponential distribution with decay parameter K|~ a. Using % as the decay parameter, X ~ Exp( ). b. Calculate the following: i. lowest value = ii. first quartile = iii. 37" percentile = iv. median = v. 63 percentile = vi. 3td quartile = vii. highest value = https://stats.libretexts.org/Learning_Objects/Worksheets-_Introductory_Statistics/1.1.03%3A_Chi-Square_- Goodness-of-Fit_(Worksheet) 2/3

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