# OSU BUSMGT 2320 - DirectFileTopicDownload (4 pages)

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- Ohio State University
- Course:
- Busmgt 2320 - Decision Sciences: Statistical Techniques

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Recitation Practice Problems One Sample Inference and p 1 Which of the following statements is false A The t distribution is symmetric about zero B The t distribution is more spread out than the standard normal distribution C As the degrees of freedom get smaller the t distribution s dispersion gets smaller D The t distribution is mound shaped 2 For a sample of size 20 taken from a normally distributed population with standard deviation equal to 5 a 90 confidence interval for the population mean would require the use of A t 1 328 B t 1 729 C z 1 96 D z 1 645 3 For a sample of size 20 taken from a normally distributed population with unknown population standard deviation a 90 confidence interval for the population mean would require the use of A t 1 328 B t 1 729 C z 1 96 D z 1 645 4 The lengths of steel rods produced by a shearing process can be modeled with a Normal distribution A random sample of 8 rods is selected and the following lengths are measured 10 9 9 10 10 1 9 9 9 8 10 10 3 Construct a 98 confidence interval to estimate the population mean length of the rods produced by the process One Sample T Length Variable Length N 8 Mean 10 0000 StDev 0 1512 SE Mean 0 0535 98 CI 9 8398 10 1602 5 Data contained in The National Survey of Student Engagement The College Student Report 2009 showed that 39 of the first year college students in a sample of 159 949 participated in community service or volunteer work a Find the margin of error using a 99 confidence level Answer 0 0031 b Here are some facts from the report that summarizes the survey The students were from 617 four year colleges and universities The response rate was 36 Institutions paid a participation fee of between 1800 and 7800 based on the size of their under graduate enrollment Discuss these facts as possible sources of error in this study How do you think these errors would affect the margin of error calculated in part a Recitation Practice Problems One Sample Inference and p 6 Senator Fogbound has

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