Intro to Statistics (8e Elemetary Statistics: A Step by Step Approach book)
MA 151

Fall 2014
Homework 4.4
1. Zip Codes How many 5digit zip codes are possible if digits can be repeated? Each digit position can have
any of 10 digits.105 = 100,000
If there cannot be repetitions? 109876 = 30,240
8. Radio Station Call Letters The call letters of a ra
Intro to Statistics (8e Elemetary Statistics: A Step by Step Approach book)
MA 151

Fall 2014
Rachelle Bumagat
October 15, 2014
MA15101
Professor Singh
Homework 4.2
1.
Define mutually exclusive events, and give an example of two events that are mutually exclusive and
two events that are not mutually exclusive?
Two events are mutually exclusive i
Intro to Statistics (8e Elemetary Statistics: A Step by Step Approach book)
MA 151

Fall 2014
Homework 6.1
1. What are the characteristics of a normal distribution?
It is bellshaped.
It is symmetric about the mean.
Its mean, median, and mode are equal.
It is continuous.
It never touches the x axis.
The area under the curve is equal to 1.
It is un
Intro to Statistics (8e Elemetary Statistics: A Step by Step Approach book)
MA 151

Fall 2014
Homework 6.3
1. If samples of a specific size are selected from a population and the means are computed, what is this
distribution of means called? The distribution is called the sampling distribution of sample means.
2. Why do most of the sample means di
Intro to Statistics (8e Elemetary Statistics: A Step by Step Approach book)
MA 151

Fall 2014
Homework 6.2
2. Teachers Salaries The average annual salary for all U.S. teachers is $47,750. Assume that the distribution
is normal and the standard deviation is $5680. Find the probability that a randomly selected teacher earns
a. Between $35,000 and $4
Intro to Statistics (8e Elemetary Statistics: A Step by Step Approach book)
MA 151

Fall 2014
What is nP0? 1
What is the difference between mutually exclusive events and independent events?
Two events are mutually exclusive when they dont have a common outcom in a
sample space while two events are independent if the occurance of one does not
affec
Intro to Statistics (8e Elemetary Statistics: A Step by Step Approach book)
MA 151

Fall 2014
Homework 5.2
1. Defective DVDs From past experience, a company found that in cartons of DVDs, 90%
contain no defective DVDs, 5% contain one defective DVD, 3% contain two defective
DVDs, and 2% contain three defective DVDs. Find the mean, variance, and sta
Intro to Statistics (8e Elemetary Statistics: A Step by Step Approach book)
MA 151

Fall 2014
Homework 5.3
1. Which of the following are binomial experiments or can be reduced to binomial
experiments?
a. Surveying 100 people to determine if they like Sudsy Soap Yes
b. Tossing a coin 100 times to see how many heads occur Yes
c. Drawing a card with
Intro to Statistics (8e Elemetary Statistics: A Step by Step Approach book)
MA 151

Fall 2014
Homework 5.1
1. Define and give three examples of a random variable.
A random variable is a variable whose values are determined by chance.
For example, if a die is rolled, a letter such as X can be used to represent
the outcomes. Then the value that X ca
Intro to Statistics (8e Elemetary Statistics: A Step by Step Approach book)
MA 151

Fall 2014
A statistic is a characteristic or measure obtained by using the data values from a sample.
A parameter is a characteristic or measure obtained by using all the data values from a
specific population.
The mean is the sum of the values, divided by the tota
Intro to Statistics (8e Elemetary Statistics: A Step by Step Approach book)
MA 151

Fall 2014
Chapter 1, the nature of probability and statistics
Statistics, the science of conducting studies to: collect, organize, summarize, analyze, and draw
conclusions from data
11
Variable: characteristic or attribute that can assume different values
Random v
Intro to Statistics (8e Elemetary Statistics: A Step by Step Approach book)
MA 151

Fall 2014
Chapter 2 Frequency distribution and graph
21
Data collected in original form is called raw data
A frequency distribution is the organization of raw data in table form, using classes and frequencies
Two types of frequency distributions that are most ofte
Intro to Statistics (8e Elemetary Statistics: A Step by Step Approach book)
MA 151

Fall 2014
Chapter 3 Data description
Traditional statistics
Average, variation, position
31 Measures of central tendency
A statistic is a characteristic or measure obtained by using the data values from a sample
A parameter is a characteristic or measure obtained
Intro to Statistics (8e Elemetary Statistics: A Step by Step Approach book)
MA 151

Fall 2014
Homework pg118121 Every 7th question starting with Q3
Chapter 3.1 Homework
Find (a) the mean, (b) the median, (c), the mode, and (d) the midrange for number 3.
3. The reported high temperatures in degrees Fahrenheit) for selected world cities on an
Octob
Intro to Statistics (8e Elemetary Statistics: A Step by Step Approach book)
MA 151

Fall 2014
Homework pg267268 #s13, 11, 14, 20, 26
Chapter 5.3 Homework
1. Which of the following are binomial experiments or can be reduced to binomial
experiments?
a. Yes
b. Yes
c. Yes
d. No
e. No
f. Yes
g. Yes
h. Yes
i. No
j. Yes
2. Compute the probability of X
Intro to Statistics (8e Elemetary Statistics: A Step by Step Approach book)
MA 151

Fall 2014
Homework pg153155 #s 18, 12, 14, 21, 28, 30
Chapter 2.3 Homework
1. What is a z score?
a. It tells how many standard deviations the data value is above or below the mean.
2. Define percentile rank.
a. A percentile rank indicates the percentage of a data
Intro to Statistics (8e Elemetary Statistics: A Step by Step Approach book)
MA 151

Fall 2014
Homework 1
Chapter 1 Homework
11. Data that can be classified according to color are measure on what scale?
a. Nominal  A
13. A variable that interferes with other variables in the study is called
a. A confounding variable  A
18. Three reasons why sampl
Intro to Statistics (8e Elemetary Statistics: A Step by Step Approach book)
MA 151

Fall 2014
Homework pg204206#s 12, 14, 19, 24; pg220224 #s 1, 12, 24, 34, 49
Chapter 4.2 and 4.3 Homework
1. Define mutually exclusive events, and give an example of two events that are mutually
exclusive and two events that are not mutually exclusive.
a. Two eve
Intro to Statistics (8e Elemetary Statistics: A Step by Step Approach book)
MA 151

Fall 2014
Homework pg267268 #s15, 7, 11, 13, 19, 27, 29, 31, 33, 37, 40, 44, 49
Chapter 6.1 Homework
1. The characteristics of the normal distribution are:
a. Bellshaped
b. Symmetric about the mean.
c. Mean, median, and mode are equal.
d. Continuous
e. Never tou
Intro to Statistics (8e Elemetary Statistics: A Step by Step Approach book)
MA 151

Fall 2014
Homework pg223235 Every 7th starting Q1; pg240241 #s1, 6, 13, 17 ; pg243245 #s 2, 10, 14,
17, 23
Chapter 4.4 and 4.5 Homework
1. How many 5digit zip codes are possible if digits can be repeated? If there cannot be
repetitions?
a. 10*10*10*10*10 = 100,
Intro to Statistics (8e Elemetary Statistics: A Step by Step Approach book)
MA 151

Fall 2014
Homework pg258259 #s 118, 21, 26 30
Chapter 5.1 Homework
1. Define and give three examples of a random variable.
a. A random variable is a variable whose values are determined by chance.
Examples will vary.
2. Explain the difference between a discrete a
Intro to Statistics (8e Elemetary Statistics: A Step by Step Approach book)
MA 151

Fall 2014
Homework pg8487 #s 1, 7, 10, 18
Chapter 2.3 Homework
1. Construct a vertical bar chart for the total number of hurricanes by month from 1851
to 2008.
7. The safe ty record of U.S. airlines for 10 years is shown. Construct a time series
graph for the data
Intro to Statistics (8e Elemetary Statistics: A Step by Step Approach book)
MA 151

Fall 2014
Chapter 62 Homework
2.
a.
b.
c.
Between $35,000 and $45,000 a year
= (4775035000)/5680 = 2.2447183098591549
z score = .9875 for 35000
(4775045000)/5680 = 0.4841549295774648
z score = .6844 for 45000
.9875.6844 = .3031
more than $40,000 a year
= (47750
Intro to Statistics (8e Elemetary Statistics: A Step by Step Approach book)
MA 151

Fall 2014
Homework Pg137141 #s 2, 4, 9, 22, 30, 36, 41, 46
Chapter 3.2 Homework
3. Why might the range not be the best estimate of variability?
a. A very high data or a very low data value will influence the range.
4. What are the symbols used to represent the sam
Intro to Statistics (8e Elemetary Statistics: A Step by Step Approach book)
MA 151

Fall 2014
Homework pg6162 #s 1, 13, 15
Chapter 2.2 Homework
1. For 108 randomly selected college applicants, the following frequency distribution for
entrance exam scores was obtained. Construct a histogram, frequency polygon, and ogive
for the data. (The data for
Intro to Statistics (8e Elemetary Statistics: A Step by Step Approach book)
MA 151

Fall 2014
Homework pg173175 #s 2, 4, 12, 16, 22
Chapter 3.4 Homework
2. The number of shark attacks and deaths over a recent 5year period is shown. Find the
mean, median, mode, midrange, variance, and standard deviation for the data. Which data
set is more variab
Intro to Statistics (8e Elemetary Statistics: A Step by Step Approach book)
MA 151

Fall 2014
Homework Pg195199 #s 111, 19, 34, 40
Chapter 4.1 Homework
1. What is a probability experiment?
a. It is a chance process that leads to welldefined outcomes.
2. Define sample space.
a. It is the set of all possible outcomes of a probability experiment i