Stat Notes 32112
22% of men have a defective chromosome, a doctor samples 80 men, what is the
probability than less than a quarter have the defect?
P = .22
N = 80
Std. Dev = (.22 x .78 / 80)1/2 = .0463
.25  .22 / .0463 = .648
P(Z < .65)
Z score of .65
(j,3
!+()nd (,l

~,eY
10.
(30 pts) The following data are a sample of the ages and the asking prices of used
Honda Accords ( in thousands) listed on Autotrader.com on Sept. 8,2002
.
3
15
.75
Age:
Price:
Resid
a.
4
13
.5
4
13
.5
11
9
.67
 
11
9
.67
10
Exam Review
1. Repeated wrist extension beyond 20 degrees can increase risk of wrist injuries. 24 students at Cornell
used a new mouse design and their wrist extension was recorded
27
28
24
26
27
25
25
24
24
24
25
28
22
25
24
28
27
26
31
25
28
27
27
25
Wh
INFERENCE
PROCEDURE
One Mean
Or
Matched pair
Two Means
Hypo: TEST
STATISTIC
H0: = 0
H0: 1 2 =0
df = smallest of and
or ugly formula
H0: p = p0
Tests:
N/A
Independence
X~N(, )
Xbar~N(,)
df = n1
df = n1
df = smallest of and
or ugly formula
One Proportion
(17) Ch 16/18 Extra Hypo Test Problems
1. Perry et a1. wanted to test the folklore that women who have not been given info about the sex of their
unborn child can guess it better than just chance levels. They asked a sample of 104 pregnant women to
guess
(16) Ch 17/16 In class Problems 2 sample
hypo
Set up Hypo Test
Define Parameters used in hypo test setup and state assumptions
Give expression and value of test stat
Give expression and value of Pvalue
Give conclusion, including a sentence as to the outc
(15) Ch 18 In Class P hypo
. The AP reported that 68% of Americans age 25 and older are overweight. We will assume this info
came from a census of the population. Suppose a dietitian from Alaska wishes to know whether the
proportion of such people in Alas
(14) Ch 16 In Class mu hypo
A standard method for recovering minerals and metals from biological materials results in a mean
copper recovery of 63 ppm when used to treat oyster tissue. A new treatment method was described
in the article "Simple Sample Dig
(13) Another ch 16 in class mu hypo
Much concern has been expressed in recent
years regarding the practice of using nitrates as meat
preservatives. In one study involving possible effects
of these chemicals, bacteria cultures were grown in a
medium contai
(11) Confidence Intervals Extra Problems
1. Suppose a randomly selected sample of 64 men has mean foot length of 27.5 cm and standard deviation
of 1.6 cm. Calculate a 95% CI for the mean foot length of women
From the above, is there evidence that the true
(9) Normal review ch 3 ( and sampling distr ch 10, 18)
1. Newsweek reported that 40% of all U.S. employees have selfinsurance health plans.
In a random sample of 100 employees, what is the probability that at least half of those in the sample have such a
(7) Honda Lin Reg problem
The following data are a sample of the ages and the asking price of used Honda
Accords (in thousands) listed on Autotrader.com on Sept. 8, 2002
Age:
12
3
10
Price:
8
7
Resid
.41
4
4
11
9
4
15
13
13
.75
?
.5
.5
10
11
9
10
14
9
9
(6)Chapter 4/5 Extra Lin Reg Problems
1.) The relationship between the depth of flooding and the amount of flood damage
was examined in the paper Significance of Location in Computing Flood
Damage (Journal of Water Resources Planning and Management <1985>
(5) Ch 4/5 in class Quit Rate/wage problem
It is certainly plausible that workers are less likely to quit their jobs when wages are high
than when they are low. The paper Investigating the Causal relationship between Quits
and Wages presented the followin
(8) Ch 9, 11 Extra problems
1. Of households in the US, 18 million or 17% have lots of cars(3 or more vehicles). (USA Today 2002).
a. If 2 US households are selected at random, what is the probability that both will have 3 or more
vehicles? .172 = .0289
b
By Greg R. Haskins
haskins02@yahoo.com August 15, 2006
Acknowledgment: Much of this paper was based on two sources, both by Robert Todd Carroll, Ph. D: 1) Becoming a Critical Thinker  A Guide for the New Millennium, Pearson Custom Publishing, 2000; and 2
Table Assignments for GISAT 160 Section 2 Fall 2010
Group 1: Monica Ahir, Courtney Clemmons, Cassidy Moellers, Joseph Taylor, Andrew Whitlock
Group 2: Taka Akiyama, Marky Duarte, Reza Mortavazi, Marie Reich, Tyler Wood
Group 3: Brad Andrick, Ben Garner, M
11/16/2011
Organizing Solutions
GROUP A Bus System
1. Increase number of buses
2. Doubledecker buses, which will increase, bus size
3. Smaller buses, but increase the number of these buses> cost efficient
4. Running two buses at once, on the same route
1) Confirmation Bias and Selective Thinking
a) Watching news networks/television networks that agree on what you will believe, just
confirms on your beliefs
b) After the full moon, there will be more crab meat, people tend to go fishing for crab more
2) F