Assignment 6.1

# 5 million a use your data to find a range of likely

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\$20.5 million.) a. Use your data to find a range of likely values for average sales for the entire company. b. The average sales for the entire company last year was reported to be \$100 million. Do your data provide sufficient evidence that the average sales record for the company is higher this year than last year? Use your answer to part a to decide 5. Scores on an MBA placement exam are reported to have a normal distribution with standard deviation 18. The exam officials stated that the average score for all students was 70, but you believe after taking this exam that the average must be lower than 70. You take a random sample of 50 students and find their average score is 67. a. Use your data to find a 95% confidence interval for the mean score for all students taking the MBA placement exam. b. Does your answer to part a support your theory that the average score for everyone taking the exam was less than 70? Discuss. 6. Which problems on this worksheet need the central limit theorem to solve, and which ones did not? Explain. 3
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