Page 1
Math 240 Extra Credit
1.
Which of the following statistics is not a measure of central tendency?
a. Mean.
b. Median.
c. Mode.
d. Q3.
2.
Which of the following is NOT sensitive to extreme values?
a. The range.
b. The standard deviation.
c. The inter
1. Would you have been long or short on Blockbuster stock at the time of the case? How about Netflix? Why? In January 2007, the Netflixs case was addressed and analyzed by Harvard Business School. In my opinion, I would have been short on Blockbuster Stoc
3.10
Descriptive Statistics for the amount ($) that 15 consumers spent for lunch
Mean
7.093333333
Median
6.8
Mode
6.5
Minimum
4.89
Maximum
9.6
Range
4.71
Variance
1.9769
Standard Deviation
1.4060
Coeff. of Variation
19.82%
Skewness
0.4403
Kurtosis
-0.5778
Ans for 6.3:
a. Z is less than 1.08
P (z < 1.08) = 0.8599
b. Z is greater than 0.21
P (z < - 0.21) = 0.4207
P (z > - 0.21) = 1 - P (z < - 0.21) = 1 - 0.4207 = 0.5793
c. Z is less than 0.21 or greater than the mean
P1 (z < - 0.21) = 0.4207
P2 (z > 0) = 1-
Ans for 4.14:
Gender
Male
Female
Total
Enjoy for Shopping clothing for Self
Yes
No
238
304
276
267
514
571
Total
542
543
1085
a. P (Enjoy shopping for clothing himself or herself) = 514/1085 = 0.474
b. P (Female and enjoy shopping herself) = 276/1085 = 0.
PRACTICE PROBLEMS: SESSION 5
#1
A burglar knows that 30% of homeowners leave a spare house key under the
front doormat. If the burglar checks a random sample of six houses, what is
the probability that:
(a) He does not find any keys. (Exactly zero keys.)
PRACTICE PROBLEMS: SESSION 3
#1
Bingos bookstore wants to determine how much of its floor space to use for
books, and how much for games and movies. 500 customers are asked if
they visit the store primarily for books, or primarily for games and movies.
Th
PRACTICE PROBLEMS: SESSION 2
#1
A random sample of four sales for Windjammer Wines yields the following
amounts (rounded off to the nearest dollar). Use only your calculator.
125
157
209
285
(a) Find the arithmetric mean.
(b) Find the median.
(c) Find the
HOW DO WE USE STANDARD DEVIATION?
The standard deviation is a statistic that tells you how tightly all the various
individual data points are clustered around the mean in a set of data. When the
individual values are pretty tightly bunched together, the s
MEAN or MEDIAN?
Why do housing price exhibits always report median price instead of mean price?
The arithmetric mean is very susceptible to outliers, that is, individual data values that are much
higher or much lower than the majority of values. Consider
THREE TYPES OF PROBABILITY
[These descriptions will help you with the Session 3 project.]
a priori probability: a priori translates roughly as from before,
meaning we know everything about the sample space before
calculating the probability. If we roll a
PRACTICE PROBLEMS: SESSION 1
#1
Classify the variables in the paragraph below as numerical and continuous;
numerical and discrete; categorical; ordinal scale.
A typical Super Steak restaurant serves anywhere from 200 to 500 full meals
every day. Fast cust
EXAMPLES: SESSION 1
Example 1:
(a) Is the table displayed below an example of descriptive statistics or
inferential statistics? Explain your reasoning.
(b) What type of variable is displayed in the table?
Total Number of Medical School Graduates, 2009
Ran
EXAMPLES: SESSION 4
MULTIPLICATION RULES
Example 1:
When you toss a coin, theres a 50% probability of heads and a 50%
probability of tails. Each separate coin toss is a statistically independent
event; the probability of heads does not change regardless o
EXAMPLES: SESSION 3
KEY DEFINITIONS: Experiment, Event, and
Sample Space.
By experiment, we mean an action whose outcome cant be predicted with
certainty. Rolling one die is an experiment; we dont know what number
will appear on the face of the die when i
Xiao Hu
ID#0582308
Chapter 13, Part 1
Math 40
7/27/2016
Ans for 13.6:
a.
Scatter Plot
90
80
70
f(x) = 0.05x - 2.37
R = 0.89
60
50
Y
40
30
20
10
0
0
200
400
600
800
1000
1200
1400
1600
X
b.
b1 = SSXY/ SSX = (i=1, n = 36) Xi Yi (i=1, n = 36) Xi) (i=1, n = 3
Xiao Hu
ID#0582308
Chapter 13, Part 1
Math 40
7/27/2016
Ans for 13.6:
a.
Scatter Plot
90
80
70
f(x) = 0.05x - 2.37
R = 0.89
60
50
Y
40
30
20
10
0
0
200
400
600
800
1000
1200
1400
1600
X
b.
b1 = SSXY/ SSX = (i=1, n = 36) Xi Yi (i=1, n = 36) Xi) (i=1, n = 3
Xiao Hu
ID#0582308
Assignment #4
Math 40
6/14/2016
Ans for 6.3:
a. Z is less than 1.08
P (z < 1.08) = 0.8599
b. Z is greater than 0.21
P (z < - 0.21) = 0.4207
P (z > - 0.21) = 1 - P (z < - 0.21) = 1 - 0.4207 = 0.5793
c. Z is less than 0.21 or greater than
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 10-K
(Mark One)
ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the fiscal year ended December 31, 2010 OR
TRANSITION REPORT PURSUANT TO
PRACTICE PROBLEMS CHAPTER 4 (1) A large chain bookstore wishes to determine how much of its floor space to use for books, and how much for games and movies. 500 customers are asked if they visit the store primarily for books, or primarily for games and mo
GGU MGT 156 COURSE PROJECT PROFESSOR RICHARD TRUTZ
Each Student or Team will select one Organization for their Course Project A. Organization can be any of the following types; for-profit / non-profit / governmental
B. It is preferred that the Student sel
Power Foods list
Fruits
Included: All fresh, frozen or canned fruits without added sugar (unsweetened) whether or not it has PointsPlus values per serving Not included: Dried fruit, fruit juices Apple Applesauce, unsweetened Apricots Banana Berries, mixed
MATH 40 SESSION 3: 1/25/11 HOMEWORK ASSIGNMENT: SESSION 3 DUE DATE: 2/1/11
(1) Read the textbook: Chapter 4, Section 4.1 (2) Homework problems: (a) 4.7 (b) 4.8 (c) 4.9 (d) 4.13 (e) 4.14 (f) 4.15 DO ALL CALCULATIONS MANUALLY (that is, using only your calcu
HYPOTHESIS TEST FOR PRACTICE PROBLEMS
1.
Sunbeam Sweets distributes bags of fruit candies labeled with a mean weight of 72 grams. Sunbeams quality control manager suspects that the bag-filling machines are putting too much candy into the bags. A random sa
University of San Francisco School of Business and Professional Studies One-Year MBA for Cohort starting Summer 2011 42 units
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