Ch 12

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West Texas A&M University *

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1324

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English

Date

Feb 20, 2024

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docx

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2

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Ch 12.2 Practice Worksheet 1. The WT Writing Center needs to report their effectiveness in order to continue to receive funding from the university. An English 1301 professor reported 60 students’ grade for their first written assignment. The English professor then required students go to the writing center prior to turning in their 2nd written assignment. The mean scores on the assignments were as follows: 1st Assignment = 70.5, 2nd Assignment = 77.2. Suppose at an α=.05 the critical values of the relevant hypothesis test are +/- 1.96 and our test statistic is greater than 1.96. Which of the following can we conclude? H 0 : µ1 = µ2 H 1 : µ1 ≠ µ2 a. There is sufficient evidence that going to the writing center has an impact on written assignment grades. b. There is insufficient evidence that the going to the writing center has an impact on written assignment grades. c. There is sufficient evidence that going to the writing center neither improves nor decreases written assignment grades. d. There is insufficient evidence that going to the writing center neither improves nor decreases written assignment grades. 2. Kimmy creates and sells beaded bracelets on Etsy. She wants to come up with a more consistent pricing model for her bracelets, so she uses number of specialty beads to estimate the selling price for her bracelets. Data for 65 orders were used to fit the simple linear regression model and the results are provided below: Y^ = -1.50+ 6.45X. 3. Identify the independent and dependent variable: X – number of specialty beads Y – price 4. Interpret b0, the y-intercept: a. All bracelets are $1.50 b. There is no practical interpretation since a beaded bracelet with 0 beads is nonsensical. c. Kimmy pays each customer $1.50 d. For every 1 bead, the price of the bracelet increases by $6.45. 5. Using the scenario above, interpret b1, or the slope: For every 1 bead, the prices increases by $6.45 6. How much should Dr. C expect to pay if she wishes to purchase a bracelet with 6 specialty beads for her mother for Mother’s Day? $37.20
7. If the correlation between the number of beads and the cost of the bracelet is .8854 and r2 = .7839, what percentage of the total variation in bracelet cost is explained by prices 78.39%
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