Exam 1 FALL 08 VERSION A solutions

What is the sample standard deviation a 767 b 600 c

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10. What is the sample standard deviation? A. 7.67 B. 6.00 C. 4.67 D. 2.18* 11. What is the mode? 12. What is the median? 13. What is the Z score of the data point 11? 14. The range of these data is? A. 46 B. 11 C. 6*
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D. 2 The following information is for Questions #15 through #19: As part of a research project a student at UNT randomly interviewed 24 fellow students concerning their monthly health insurance costs. The goal was to estimate the student insurance costs for all UNT students. Data below are in $/month. First Quartile = 104 Third Quartile = 194 98, 104, 104, 128, 144, 149, 152, 156, 166, 171, 173, 174 Mean = 183.39 178, 181, 183, 185, 191, 197, 200, 211, 246, 281, 290, 300 Std. Dev. = 54.88 15. Using the data above, what is the 80 th percentile? 16. The 38 th Percentile is: 17. The Z Score for the data point 290 is: 18. The Median of these data is: A. 0 B. 176* C. 178 D. 290 19. Using the data you have shown above, how many data points are actually within +2.0 and -1.0 standard deviations of the mean?
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20. Considering the data set above, is it positively or negatively skewed. Use the Pearson Coefficient concept A. Positive* B. Negative 21. A random sample (n = 420) has a standard deviation = 5. The Z score of the observation = 80 is 3.40. What is the mean of these data?
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