# 3 - Due: Wednesday, September 19, 2007 11:59 PM EDT...

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Due: Wednesday, September 19, 2007 11:59 PM EDT Current Score: 17 out of 30 Question Score Submission Options Description Homework #3 covers numerical summaries, z- scores, the 68-95- 99.7 rule, and changing the units of measurement. These topics are in Lecture Unit 2. You are allowed 4 submissions of the assignment. This homework is worth 30 points. The assignment is due by 11:59 pm Monday, Sept. 17. Instructions Homework #3 You are allowed 4 submissions. This homework is worth 30 points. The due date is 11:59 pm Wednesday, Sept. 19. 1. [MStat2 1.006.] 2/2 points Last Response | Show Details All Responses Notes A study in Switzerland examined the numbers of caesarean sections (surgical deliveries of babies) performed in a year by doctors. Here are the data for 15 male doctors: 27 50 33 25 86 25 85 31 37 44 20 36 59 34 28
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Make a stem plot. What is the mean for the data?41.33 41.33 the median?33.5 34 Now exclude the two outliers from your stemplot and recalculate the mean, 34.84 34.54 and median. 33 33 2. 3.5/3.5 points Last Response | Show Details All Responses Notes New York Yankee Roger Maris held the single season home run record from 1961 until 1998. Here are Maris' home run counts for his 10 years in the American League: 14 28 16 39 61 33 23 26 8 13 Maris' record 61 home runs in 1961 is an outlier in this data set. Question 1 . Find the mean, median, and the standard deviation. Mean:26.1 26.1 Median:24.5 24.5 Stand deviation:15.61 15.61 Question 2 . Find the mean, median, and standard deviation for the 9 observations remaining when you leave out the outlier. Mean:22.2 22.2 Median:23 23 Stand deviation:10.24 10.24 Did omitting the outlier increase or decrease the mean and standard deviation? (your answer should be one of the words "increase" or "decrease", without the quotes). decrease decrease 3. --/2 points No Response | Show Details Notes
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Read the following explanation of z-scores, or standardized scores. Then answer the questions that follow. Explanation of z-scores It is often useful to know how many standard deviations a data point x is from the mean. We define z-scores , or standardized scores , as the distance x is from xbar (the mean) in units of the standard deviation. We calculate the z-score for x as follows: z = (x - xbar)/s A z-score of +2 means that an observation is 2 standard deviations above the mean. A z-score of -1.5 means that an observation is 1.5 standard deviations below the mean. End of z-score explanation . Question:
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This note was uploaded on 03/22/2008 for the course BUS 350 taught by Professor Reiland during the Spring '08 term at N.C. State.

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# 3 - Due: Wednesday, September 19, 2007 11:59 PM EDT...

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