Estimating a Population Proportion
Goal: Given a sample proportion, estimate the
value of the population proportion p.
Example: In a sample of 750 people, 27%
said they feel that health care is the most
important issue facing our state. What
proportion of
2. The formula for a regression equation is Y = 2X + 9.
a. What would be the predicted score for a person scoring 6 on X?
y=2(6)+9=21 Predicted score would be 21.
b. If someones predicted score was 14, what was this persons score on X?
x=14-(9)= 5/2= The
#17
.6247 = 62%
#19
1/SQRT400
1/20
SD = .5
#21
Null hypothesis: Ho: p=0.5
Alternative hypothesis: H1: p>0.5
a. Sample size n=400
Sample proportion P=0.55
Testing the hypothesis use Z-statistic for a single mean
Value for z=2.00
b. (>) Test is based on rig
lease do the following problems from the Illowsky text.
Page. Try It
414. 8.1
418. 8.3
420. 8.4
430. 8.10
Optional Week 5 Kulansky Review Problems
Actions for Optional Week 5 Kulansky Review Problems
Use for Questions 1 and 2: A grocery store takes a rand
Page. Try It
374. 7.1
379. 7.5
379. 7.6
From last week's Kulansky Review (Originally 3B - Renamed kulansky review week
4):
1. A random variable that can assume only a finite number of values is? A Discrete
Random Variable
2. same as #1 but an infinite num
11.1 A factory manager needs to understand how many products are defective versus how many are
produced. The number of expected defects is listed in Table 11.5. Number produced Number defective
0100 5 101200 6 201300 7 301400 8 401500 10 Table 11.5 A rand
100%
Examining Distributions Checkpoint 1
Attempt 2 of 2
Started:03/17/2016 1:18 PM EDT
Submitted:03/17/2016 1:50 PM EDT
Score:100%
Points:60 out of 60
Question 1
Points: 10 out of 10
This histogram shows the times, in minutes, required for 25 rats in
an
Page 70. 2.2
The following data show the distances (in miles) from the homes of off-campus statistics
students to the college. Create a stem plot using the data and identify any outliers: 0.5; 0.7; 1.1;
1.2; 1.2; 1.3; 1.3; 1.5; 1.5; 1.7; 1.7; 1.8; 1.9; 2.
#17 .6247 = 62%
#19 1/SQRT4OO
1/20
SD = .5
#21 Null hypothesis: H0: p=0.5
Alternative hypothesis: H1: p>0-5
a. Sample size n=400
Sample proportion P=0.55
Testing the hypothesis use Zstatistic for a single mean
Zipg; 0,5521 _ Margitor): ;_00
Value for 2:2.
Wart
6.1 What is the zscore of x, when x = 1 and X "' N(12,3)?
6.2 Fill in the blanks. Jerome averages 16 points a game with a standard deviation of four points. X "
N(16,4). Suppose Jerome scores ten points in a game. The zscore when x = 10 is 1.5. This
Week 2 HW
Solutions
1.
7. For the data from the 1977 Stat. and Biom. 200 class for eye color, construct:
a. pie graph
b. horizontal bar graph
c. vertical bar graph
d. a frequency table with the relative frequency of each eye color
Eye Coloir
Number of Stu
Statistiques AMPHI n1
Outils statistiques :
Introduction :
On utilise les statistiques lorsquil y a beaucoup de donnes.
Elle serve analyser et interprter les donnes.
La statistique descriptive : sert rendre les informations de beaucoup de donnes, utilisab
Quiz Submissions - Grd Hwk Wk 1
Alan Marroquin (username: AMARROQUIN1)
Attempt 1
Written: Oct 31, 2016 11:51 PM - Nov 1, 2016 12:20 AM
Submission View
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Question 1
10 / 10 points
A Lake Tahoe Community College inst
Running Head: WAL-MART
1
Wal-Mart
Student Name
Course Name
31 Aug 2016
WAL-MART
I.
Introduction
Wal-Mart Stores, company, like numerous large retail as well as grocery chains, presents store
brands, usually demoted to as house products and also generic pr
STAT 225
1. (3 points) Given the above information, what kind of hypothesis test will you conduct? ztest,
t-test, -test, -test, Y-test, or F-test? Please explain.
This would be test of one mean, comparing the sample mean against the hypothesized value
of
Stat quiz 3
1.H0: P1=P2 H1: P1P2 where
P1 and P2 are the proportions (how many needed repairs in first 2 years of A model consumer group
and B model consumer group)
A model car consumer group:
Sample size n1=400 and x1=53 therefore sample proportion p1=53