07F_QUIZ1A

07F_QUIZ1A - WEB-DISTANCE ST 370 Quiz 1 Autumn 2007 ver. A...

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WEB-DISTANCE ST 370 Quiz 1 Autumn 2007 ver. A NAME_______________________________________ ID # _________________________________________ I will neither give nor receive help from other students during this quiz Sign ___________________________________________ PROBLEM 1: If the number 3 is added to every member of a sample of observations (as might happen if an ohm meter was not zeroed before doing measurements) THEN a) the sample mean does not change b) the sample median does not change c) the sample standard deviation of the sample does not change d) the sample variance is increased by 9 times e) the sample variance is increased by 3 times PROBLEMS 2 and 3: A sample of 5 cars parked along the Hillsborough Street across from the library revealed the following data on the NUMBER OF M&M’s on the floor under the passenger-side seat 33, 7, 3, 54, 12 2) The value of the (Sample Mean MINUS the Sample median) for this dataset is : a) 12.3 b) 5.2 c) 9.8 d) 18.5 e) none of these 3) What is the 37 th percentile for this dataset a) 7.4 b) 8.1 c) 8.4 d) 9.6 e) none of these PROBLEM 4) How is the correlation coefficient r related to the least squares slope b a) r = b s Y / s X b) r = b s X / s Y c) r = s X / (b s Y ) d) r = s Y /( b s X ) e) none of these
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PROBLEM 5) A data set for precipitation has 86 observations and the stem and leaf plot is given below. The 75th percentile is a) 3.62 b) 3.70 c) 3.78 d) 3.84 e) 4.26 LEAF ( LAST DIGIT) 0.| 3 3 4 5 6 7 7 8 1.| 0 1 2 2 2 5 5 6 8 8 8 Stem 2.| 0 0 1 2 2 2 3 4 4 6 6 6 7 7 8 9 9 9 9 9 9 9 9 3.| 0 1 1 1 2 2 2 3 3 3 3 4 4 4 4 5 6 6 6 6 6 6 7 7 7 8 8 9 9 4.| 0 0 0 0 0 1 2 4 5 8 5.| 0 4 4 8 9 PROBLEM 6)
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07F_QUIZ1A - WEB-DISTANCE ST 370 Quiz 1 Autumn 2007 ver. A...

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