{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

# # 3 - Due Wednesday 11:59 PM EDT Description Current Score...

This preview shows pages 1–4. Sign up to view the full content.

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

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
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
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: Three landmarks of baseball achievement (besides the achievements of Babe Ruth and Henry Aaron) are Ty Cobb's batting average of .420 in 1911, Ted William's .406 in 1941 and George Brett's .390 in 1980. These batting averages

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 9

# 3 - Due Wednesday 11:59 PM EDT Description Current Score...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online