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Exam #1, version I
Elementary Statistics, Math 1342
Fall 2011
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Exam #1, version 1
Elementary Statistics, Math 1342
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Fall20l5
For problems I
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4, circle the best answer.
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Every fifth adult entering an airport is selected for additional security screening. What
A probability # has to be between 0 and 1
If 2 events are DISJOINT they cannot happen at the same time
If RESIDUAL is positive, the observed value is larger than the predicted,
and the individual is above average.
To extrapolate when doing least
squar
Binomial Probabilities
This can be a very confusing topic, but it does make a decent amount of sense if you see it from
a good perspective. First off, our book defines a binomial experiment as any experiment that
satisfies 4 conditions. The good news is w
5.3 Independence and the Multiplication Rule
5.3 Independence and the Multiplication Rul
In the previous sections of this chapter we discussed events in terms of word or for example, What is
the probability of drawing a king or diamond? Now we will discus
2.1 Frequency Distribution
To express data as percentages we construct a relative frequency distribution.
Definition: relative frequency= frequency/sum of all frequencies
Democratic
Republican
Independent
Frequency
14
6
14
Relative Frequency
14/34=41
6/34
1.4 Other Effective Sampling Methods
There are four methods of obtaining random samples. We have already discussed
simple random sampling. There are three other sampling methods (a) Stratified
Sample (b) Systematic Sample (c) Cluster Sample
Mutual Exclusi
Lecture notes:
Chapter 1: Data Collection
1.1: Intro to the Practice of Statistics
Statistical Thinking: To think statistically means one can understand large amounts of
data and information by applying mathematical formulas.
These formulas can help us un
3.2 Measures of Dispersion
M=80% and SD=10%
Formula= subtract the SD from left and Add to righ
According to the Empirical Rule 68% of people made (70,90) (1 SD)
95% of people made (60,100) (2 SD)
99.7 of people made (50, 110) (3 SD)
Definition: Zscore is
1.4 Other Effective Sampling Methods
There are four methods of obtaining random samples. We have already discussed
simple random sampling. There are three other sampling methods (a) Stratified Sample
(b) Systematic Sample (c) Cluster Sample
Mutual Exclusi
2.2 Organizing Quantitative Data: The Popular Displays
Recall: Quantitative variables are two different types, discrete and continuous data.
To organize discrete and continuous date we construct something similar to a bar
graph called a histogram.
Definit
3.3 Measures of Tendency and Dispersion from Grouped Data
Calculator Instructions
Stat
Edit
Enter mid points of column 1 in L1 and column 2 in L2
Stat, Calc, 1 Vars Stat
Enter L1 comma L2 and press enter
Standard Deviation for grouped data:
Standard devia
1.3 Simple Random Sampling
When collecting data for a sample from a population we must be fair as possible and select
individuals by chance. For example : Suppose a TV host with a nationwide audience asks
the audience to call in for a A or B response to s
Population variance (o^2) equals sum ( each x squared divided by N) minus (sum of x divided by N)
Population mean = = X / N
OR
Sample mean = x = x / n
interquartile range is equal to Q3 minus Q1.
Population Variance 2 = ( Xi  )2 / N
Sample Variance s2 =
Elem Statistics
 Review #1
 Sections 1.1
 3.2
Name_
1) Which of the following is not true of statistics?
A) Statistics involves collecting and summarizing data.
B) Statistics is used to draw conclusions using data.
C) Statistics can be used to organize
1342 Final Review Sheet
No review can be completely comprehensive. This should be a fairly good representation of
the types of problems from this semester, but it does not include an example of everything!
1) The data on the number of unhealthy days in a
Exam #4 Review Sections 6.2, 7.1, 7.2, 8.1, 9.1, 9.2
ON
Provide an appropriate response.
1) Aquiz consistsoflOtrueorfalse questions. Topassthequiz astudentmust answer atleast 1)
eight questions correctly. If the student guesses on each question, what is t
Calculator Guide TI83/TI84
For data:
STAT EDIT
Enter data:
1:Edit
Type the data points in List 1 (L1)
Sort data:
2:SortA (ascending) or 3:SortD (descending)
Type which list(s) to be sorted. For example: SortA(L1)
Clear a list of data:
4:ClrList
Type whi
1342 Answers for Final Review
1. a) Variable = number of unhealthy days. It is a quantitative variable.
b) highest = 93 days
lowest = 0 days.
Class width=
930
=13.28 =14
7
Unhealthy Days in U.S. Cities
Number of
Days
0 13
14 27
28 41
42 55
56 69
70 83
84
Sections 1.3, 1.4, 2.1, 2.2
Again, read the ebook, watch videos, read the PowerPoints, etc. before starting
homework for each section. That will be assumed now for each week.
Sections 1.3 and 1.4 are over sampling methods. Once you learn these concepts, y
Finding the Mean and Standard Deviation of Grouped Data
Here is a frequency distribution:
Class limits frequency (f)
5059
4
6069
318
7079
1441
8089
1533
9099
502
100109
12
First lets calculate the mean. The formula we will need is
fi xi
f
. Now let
Finding the Mean and Standard Deviation of Grouped Data
Here is a frequency distribution:
Class limits frequency (f)
5059
4
6069
318
7079
1441
8089
1533
9099
502
100109
12
First lets calculate the mean. The formula we will need is
fi xi
f
. Now let
Answer questions #1  #7 using the written article Why Six Hours Of Sleep Is As Bad As None At
All (Links to an external site.).
Explain the reasons the editor, Kathleen Davis calls the study in the video " a very unscientific study":
1. What is the popu
MATH 1342 STUDY GUIDE
CHAPTERS 1 AND 2
The study guide is only a guide to the topics that have covered and could be tested. Homework, study plan,
quizzes and practice homework exercises are other examples of questions that you can use for practice.
Identi
Chapter 3
Chapter 3 has a lot more computations than the previous two chapters. It will take
longer for you to do the homework and quiz assignments, so make sure you allow for that.
Section 3.1 is finding mean, median, and mode and the relationships betwe
xi
n
Stats science
Dscrptive
clect, organze,
Stats procdres
sumrz,analyz info SystmtcRndm Smplng tht r usd 2
Pop Mn () =
draw conclu.
methd f samp nwhich
smmrize,
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elmnts r slcted frm list or orgnze, smplfy
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MATH 1342 STUDY GUIDE
CHAPTER 3
Section 3.1
1) The number of visitors in an hour to a Railroad Museum is given for a sample of 8 randomly
selected hours. Find the mean, median, and mode for this data set. Round answers, as
needed, to one decimal place.
43