BUSI 2305 Final exam_V1 Save Submit Test for Grading tions ca1mbs08t.08.017 ◄ Question 43 of 45 ► If an interval estimate is said to be constructed at the 90% confidence level, the confidence coefficient would be O a. 0.05 O b. 0.90 O c. 0.95 O d. 0.10 Search web & PC
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Step 1: Recall that the confidence coefficient is the confidence level expressed as a decimal (equivalently 1 − α, where α is the significance level). Show more…
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A) What proportion of OSU undergraduates study at least 25 hours a week? You survey a random sample consisting of n = 325 OSU undergraduates and find that 156 of them study at least 25 hours a week. Use this information to construct a 95% confidence interval in order to estimate the proportion of all OSU undergraduates who study at least 25 hours a week. As you construct the interval, try not to do a lot of rounding until you reach the end of your calculations, and then choose the answer below that is closest to what you calculate. A. 0.426 to 0.534 B. 0.375 to 0.585 C. 0.230 to 0.730 D. 0.477 to 0.483 E. 0.452 to 0.508 B) You want to estimate the proportion of students at OSU who use the Grubhub app. You select a random sample of 575 OSU students and find that 368 use the Grubhub app. If you want to construct a 90% confidence interval, what will the margin of error be? As you construct the interval, try not to do a lot of rounding until you reach the end of your calculations, and then choose the answer below that is closest to what you calculate. A. 0.010 or smaller B. 0.020 C. 0.033 D. 0.041 E. 0.055 or larger C) A 95% confidence interval is constructed based on a sample of data, and it is 64% ± 4%. A 90% confidence interval based on this same sample of data would have: A. The same center and the same margin of error. B. A different center and a smaller margin of error. C. The same center and a larger margin of error. D. A different center and a larger margin of error. E. The same center and a smaller margin of error.
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A financial officer for a company wants to estimate the percent of accounts receivable that are more than 30 days overdue. He surveys 500 accounts and finds that 300 are more than 30 days overdue. Compute a 90% confidence interval for the true population proportion of accounts that are more than 30 days overdue. Which of the following intervals is closest to the correct answer: Select one: a. between 59.9% and 60.0% b. between 58.2% and 62.1% c. between 56.4% and 63.6% d. between 57.8% and 62.1% e. between 90% and 95%
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