Interpreting the Confidence Interval
Will Valdez
ITT Technical Institute
Interpreting the Confidence Interval
A simple random sample of 40 salaries of NCAA football coaches has a mean of
$415,953 and a standard deviation of $463,364.
Construct a 95% confi
Inferences from Two Proportions and Samples
Will Valdez
ITT Technical Institute
Inferences from Two Proportions and Samples
Task 1: Solve the following problems: A student of the author surveyed her
friends and found that among 20 males, 4 smoke and among
Green M&Ms and Diamond Pricing
Will Valdez
ITT Technical Institute
Task 1: Read the following case study, titled Green M&Ms:
Green M&Ms: Consider a class of 20 statistics students, where each student is
given 5 small bags of M&Ms and asked to count the nu
Oscar Madriz
MA 3110
Exercise 2-2
TV Networks
10
9
8
7
6
CBS
FOX
ABC
5
4
3
2
1
0
TV Networks
25%
45%
30%
CBS
FOX
ABC
Each chart is an appropriate choice. I would decide on how it needs to be presented. For
example, the pie chart works better when data nee
The amount of money spent on various items in a persons monthly budget
I believe that pie chart would make a great visual representation for displaying
ones monthly budget. The total allowed to spend would make up the entire pie and then
the individual wo
Shawn Montgomery
MA3110: Module 6 Exercise 1
August 21, 2016
Task 1:
The computed correlation coefficient between these two variables is 0.8717 and the
critical value from the table is 0.754.
As the correlation coefficient is more than the critical value
Shawn Montgomery
MA3110: Exercise 5.2
August 15, 2016
What is the population under consideration?
The Presidents of the United States
What are the two variables under consideration?
The two variables under consideration are the region of birth and politic
MA3110: Module 2 Probability and Normal Distribution
Andrew Lewis 08/14/16
CBS
ABC
9
Fox
5
6
Number of Occurances
Fox
ABC
CBS
0
1
2
3
4
5
6
7
Percentage of Occurances
Fox ; 30%
CBS ; 45%
ABC; 25%
CBS
ABC
Fox
8
9
Task 1
The Graph I believe that better represents the data is the bar graph.
I say this because there isnt really a reason to use a pie chart, its not part of a whole (that I know of). Its
just data. If it said the number of occurrences out of 20, then I
Shawn Montgomery
MA3110: Exercise 4.2
1.
P=the proportionof peopleaged 1825 who currently use illicit drugs
P=.20
The null hypothesis H 0alternative hypothesis H 1 symbolic form are :
H 0 : p=0.20H 1 : p 0.20
2. Two-tail test:
=0.10 =0.05 1=10.05=0.95
2
Shawn Montgomery
MA3110: Module 4 Exercise 1
July 21, 2016
Exercise 4.1 Interferences from Two Proportions and Samples
Task 1
A student of the author surveyed her friends and found that among 20 males, 4 smoke
and among 30 female friends, 6 smoke. Give tw
Shawn Montgomery
MA3110: Module 3 Exercise 2
July 17, 2016
Part A
Students
Bag
1
Bag 2
Bag 3
Bag 4
Bag 5
Sum
of
variable
s
Number
of
variable
s
Sampl
e
Mean
Standard
5
6.8
4.32435
Deviatio
n
Student 1
3
4
7
6
14
34
Student 2
12
14
18
8
3
55
11
5.744563
St
MA3110: Statistics
Module 2 Exercise 2.1
Terry Hashley
3/24/2016
Determine whether or not the data represent a probability distribution:
If the data represent a probability distribution, find its mean and standard deviation:
o The data does not represent
MA3110: Statistics
Module 1 Exercise
Terry Hashley
3/15/2016
Task 1: Exercise 1.1
Question 1.1
Define the following terms:
Population
o The group of objects (whether it be people, items or otherwise) which are being polled
for the statistical study.
Sampl
Terry Hashley
MA3110: Statistics
4/3/2016
Module 3 Exercise 1
A simple random sample of 40 salaries of NCAA football coaches has a mean of $415,953 and a standard
deviation of $463,364. Construct a 95% confidence interval estimate of the mean salary of an
Problem 1
Difference
Wins
163
0.599
55
0.537
-5
0.531
88
0.481
51
0.494
16
0.506
-214
0.383
I have to make images of the
plots so you can see them in
the homework for some reason.
That's why it's an image.
Linear Correlation Coefficient = 0.8717 - Critica
MA3110: Statistics
Module 2 Exercise 2.2
Task 1
CBS
Fox
ABC
Total
9
6
5
20
Terry Hashley
3/24/2016
I feel the pie chart is the most representative of the
data as it gives an overall representation of which data
point (CBS, Fox, ABC) is most frequently sho
MA3110: Exercise 4.2
Hypothesis Testing
Terry Hashley
4/26/2015
Question 1:
Null Hypothesis H0 : p = 0.20
Alternative Hypothesis H1 : p 0.20
Question 2:
Being two-tailed, divide in half:
.1 / 2 = .05
P (Z < z*) = .05
z* = -2.5 and with symmetry +2.5
Z = 2
Task 1 - Part 1: 1. The sample size is not independent as the same population is being
sampled. 2. We need to use normally distributed populations with simple random samples
which is not what is used in this example.
Task 1 - Part 2: Theoretically the sam
Task 1
A
1
3
5
3
2
4
Source
Treatment
Error
Total
B
0
6
2
5
2
3
2.449
6
df
2
9
11
C
3
12
6
3
By hand
.05 Level of Significance
4
Sample Mean
6
Mean
4.243
Standard Deviation
18
Variance
110 Total Sum of Squares (SST)
24 Treatment Sum of Squares (SSTR)
86 E
Party
F
R
R
F
U
D
DR
R
D
DR
R
R
DR
R
D
DR
R
D
D
D
R
D
R
R
W
D
D
W
R
R
D
R
R
W
R
D
W
D
R
D
R
D
What is the population under consideration? The first 44 US presidents
What are the two variables under consideration? Region and Party
Region
Region
SO
SO
MW
NE
The requirements for using this method :
1. The samples should be 2 simple random samples
2. The number of successes and the number of failures should be at least 5 for all parts.
1. The claim is that the population proportion is .15
answer: H0: p = 0.20
Someone wants to estimate the mean age for college students. A random sample of 49 students indicates that the mean a
Since the population standard deviation is known, you can use the z score.
First, find the z score for the given confidence interval rang
Statistics 3110
Exercise 1
A simple random sample of 40 salaries of NCAA football coaches has a mean of $415,953 and a standard
deviation of $463,364. Construct a 95% confidence interval estimate of the mean salary of an NCAA
football coach.
In a study de
Assignment 1 - 12.14.14
MA3110 Statistics
Central Tendency and Measures of Variation
TASK 1:
1.1 Define:
1.
Population - the specified extent or degree to which an area is or has been populated
[SOURCE:www.dictionary.com] In my own words population is the