Confidence Interval for population proportion (P)
P = population proportion, ie: the true fraction of individuals or objects with a specific
characteristic.
x
# of people with characteristic
P = sample proportion = =
n sample size (total # in the sample)
University of PEI
Fall 2015
Math 221
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Assignment # 5
Due on Tuesday, November 10, 2015. Late submission NOT accepted
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Question 1 (32 points)
The mean time to download the homep
University of PEI
Department of Math & Stats
Fall 2015
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Math 221: Assignment # 3
Due in class on Thursday, October 8, 2015. Late assignments will not be accepted.
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University of PEI
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Math221
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Fall 2015
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Assignment # 4
 Due in class on Thursday, October 29th .
 Late submission is NOT accepted.
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Question 1 (60 points)
Annual salaries of u
University of PEI
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Fall 2015
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Math 221:
Assignment 2
 Due in class on Thursday, October 1st. Late assignments not accepted. Answer on this paper.
Question 1: Choose 5 classes to represent t
University of PEI
Department of Math & Stats
Fall 2015
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Math221: Assignment # 1

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Chapter 8
81
Chapter 8:
Confidence Intervals
Content of this chapter
* Confidence Intervals
1) Population Mean,
Point and Interval Estimates
A point estimate is a single number,
a confidence interval provides additional
information about variability
whe
Chapter 7
Learning Objectives
Chapter 7
In this chapter, you learn:
The concept of the sampling distribution of the
mean
Sampling Distribution
Of the Mean
To compute probabilities related to the sample
mean
The importance of the Central Limit Theorem
Deve
The Normal Distribution
Chapter 6
Bell Shaped
Symmetrical
Mean, Median and Mode
are Equal
Location is determined by the
mean,
The Normal Distribution
In this chapter, you learn:
To compute probabilities from the normal distribution (we will use
the Table
Definition:
Chapter 5
Discrete Random Variables
Example
A professor asked his introductory statistics students to
state how many siblings they have. Table 5.1 presents a
groupeddata table for that information. The table shows,
for instance, that 11 of th
Introduction to Probability
Example 4.3
When two balanced dice are rolled, 36 equally likely
outcomes are possible:
< &
The sum of the dice can be 11 in two ways. The
probability the sum is 11 is f/N = 2/36 = 0.056.
Doubles can be rolled in six ways.
Mean of a Data Set
The mean of a data set is the sum of the observations
divided by the number of observations.
Descriptive Measures
Median of a Data Set
Mode of a Data Set
Arrange the data in increasing order.
Find the frequency of each value in
GROUPED DATA
mean =
f (m x ) 2
mf
; standard deviation = sqrt
n
n 1
PROBABILITY FORMULAS
1)
2)
3)
4)
5)
6)
P(A or B) = P(A) + P(B) P(A and B)
P(A/B) = P(A and B) / P(B)
P(A) + P( A ) = 1
P(A/B) + P( A /B) = 1
P(A and B ) = P(A) P(A and B)
P( A and B )