b. I chose the number of classes based on the Sturges’ Rule table. I knew I had 80 observations so that put me between either 7 or 8 classes. I chose 8 for both because that allowed the data to completely taper off at the very ends of the data; meaning the extremely low values were caught within the first and the last classes. I chose the width of the classes by taking the lowest value minus the highest value and then dividing that number by the amount of classes I intended on using. For example, in the MPG histogram I took 44 minus 11 and then divided by 8. That gave me about 4.13 so I rounded up to five to make all the numbers whole numbers. c. In the MPG histogram the central tendency is from 16 to 31. Over 78% of the data is within that range. This histogram is evenly distributed with an average “bell shaped curve”. This histogram is also evenly dispersed throughout the data. There are some extremely low values as well as some extremely high values with one modal class and several classes fairly evenly increasing and decreasing on either side of it. The Weight histogram is also fairly evenly distributed. It has a slight dip in the middle of the data, but overall it increases in the middle of the data and decreases towards the end of the data. The central tendency is from 1780 to 3700, where over 78% of the data lies. The dispersion in the weight histogram is also pretty even with some extremely low values and some extremely high values. The modal class is from 2740 to 3220 and the classes on either side of it are evenly decreasing. 2.

...Page 1 of 3
ASSIGNMENT 2ND SEMESTER : STATISTICAL ANALYSIS (STAT) STUDY UNITS COVERED DUE DATE TOTAL MARKS : CHAPTERS 1 - 8 : 3.00 p.m. 17 AUGUST 2010 : 100
INSTRUCTIONS TO CANDIDATES FOR COMPLETING AND SUBMITTING ASSIGNMENTS
The complete ‘Instructions to Students for Completing and Submitting Assignments’ must be collected from any IMM GSM office, the relevant Student Support Centre or can be downloaded from the IMM GSM website. It is essential that the complete...

...Displaying categorical data HW
3.1 Each person in a nationally representative sample of 1252 young adults age 23 to 28 years old was asked how they viewed their “financial physique” (“2009 Young Adults & Money Survey Findings,” Charles Schwab, 2009). “Toned and fit” was chosen by 18% of the respondents, while 55% responded “a little bit flabby,” and 27% responded “seriously out of shape.” Summarize this information in a pie chart.
3.3 A survey conducted by Robert Half Technology...

...an associate degree?
•
•
•
•
15%
12.5%
7.5%
5%
5B. How many women with a Master’s degree gave birth in 1998?
•
•
•
•
30 million
300 thousand
3 million
4.5 million
Page 4 of 8
Revised 02/03/2010
2201_Quiz1A.docm
6. The following frequency histogram represents the IQ scores of a random
sample of seventh grade students. IQs are measured to the nearest whole
number. The frequency of each class is labeled above each rectangle.
6A. How many students were measured?
•
•
•
•...

...explain the meaning of the 95% confidence interval in this context.
Solution:
a) The sample size is 50; the mean class size is 21.8 which is less than the median 23.45.
This indicates a negative skew, also seen in the boxplot and histogram. No outliers are present.
Spread: Classroom sizes range from 9 to 28.5. The stdev is 5.464.
Shape: Note the large group of classes at the top end of the scale.
b) Not really a fair impression as the data...

...Statistics 5371 Final Exam Review Fall 2012.
1. Suppose a researcher wants to design a new study with a power of 0.8 and a significance of 0.05 to test whether the caffeine content for a brand of coffee is really 100mg. A previous study gave a mean caffeine level for this brand of 110 mg and a standard deviation of 7 mg. Use PROC POWER to determine how many cups of coffee need testing.
2. A company did a study to estimate the effect of different promotional strategies on the market...

...Basic Tools for Process Im provem ent
What is a Histogram?
A Histogram is a vertical bar chart that depicts the distribution of a set of data. Unlike Run Charts or Control Charts, which are discussed in other modules, a Histogram does not reflect process performance over time. It's helpful to think of a Histogram as being like a snapshot, while a Run Chart or Control Chart is more like a movie (Viewgraph 1).
When should we use a...

...WILMINGTON UNIVERSITY
CLASS INFORMATION & SCHEDULE
FACULTY MEMBER: TERM:
COURSE TITLE:
COURSE NUMBER: MBA 6100
OFFICE HOURS/METHOD OF CONTACT:
I. METHODOLOGY:
A. Teaching Methods: Distance learning course
Announcements and instructor guidance; assigned readings; homework problems, chapter information, textbook power point files, and case study.
This course requires stable and regular access to the internet as well as students’ ability to work independently and...