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Stat 1430
Rec 3B
SD and Boxplots
STANDARD DEVIATION
1. Suppose the mean of a data set is 10, the median is 20, and the standard deviation is 5.
What happens if you multiply all the values in the data set by 1?
a. The mean, median, and SD are all multipli
STAT 1430
REC 5
SEC 3.2
EXPERIMENT
Suppose we want to study and compare the volume of popcorn produced by two brands of
microwave popcorn. We will take 30 bags of popcorn of brand A and 30 of brand B and pop the
bags in a random order, one at a time, in t
STAT 1430
REC 7
SEC 2.12.4
REGRESSION
Nash Information Services provides information and analytical services to the movie
industry, including analyses to predict movie revenue.
To study movie revenue, they chose a simple random sample of 40 movies releas
STAT 1430
REC 4
SEC 3.1
SAMPLES AND SURVEYS
Next 2 problems: A marketing research firm wishes to determine if the adult men in Laramie,
Wyoming would be interested in a new upscale mens clothing store. From a list of all
residential addresses in Laramie,
STAT 133
FINAL EXAM
SP 2011
NAME_
TOTAL NUMBER OF POINTS ON THIS EXAM: 250. There are 50 pbms, each worth 5 points.
NOTE: IN FAIRNESS TO ALL STUDENTS, WE CAN NO LONGER ANSWER QUESTIONS
DURING OUR EXAMS. ANSWER THE QUESTIONS TO THE BEST OF YOUR ABILITY.
IF
STAT 133
FINAL EXAM
SP 2011
SOLNS
1.
A percentile is the same thing as a percentage.
a. TRUE
b. FALSE
2.
If X has a normal distribution, when does X also have a normal distribution?
a. The Central Limit Theorem is needed; n has to be large.
b. The Central
STAT 1430
REC 10(SOLUTIONS)
SEC 5.1
PROBABILITY
1. The multiplication rule says that if A and B are any two events,
P(A and B) = P(A)*P(BA) or P(B)*P(AB)
2. If A and B are independent, then what does the multiplication rule look like?
P(A and B) = P(A)*
STAT 1430
SEC 6.2
REC 23
HYPOTHESIS TESTING
Hypothesis Testing
Instructions: For any true/false question, if you answer false, say why it is
false.
1. A null hypothesis contains the value of a:
a. Statistic
b. Parameter
c. Both a and b
d. Neither a nor b
Stat 1430
Recitation 21
Section 4.4
1. Parameters and Statistics
a. A parameter is a number that describes the population
b. The value of a parameter is unknown (known, or unknown) by the
researcher.
c. Statistic: a number that describes a sample
d. A sta
STAT 1430
REC 20 (SOLUTIONS)
SEC 5.3
BINOMIAL DISRIBUTION
1. Results show that 80% of all university basketball players graduate.
a. You choose 5 university basketball players at random. What is the chance
that at least 3 of them graduate? (do not use tab
Stat 1430
Recitation 22
Section 6.1
Confidence Intervals
Instructions: All confidence intervals are 95% unless otherwise indicated. This also
applies on exams. Show supporting work and use proper notation for full
credit.
Suppose you want to estimate a pa
STAT 1430
SEC 6.2
REC 23 (SOLUTIONS)
HYPOTHESIS TESTING
For any True false questions if false tell why it is false.
1. A null hypothesis contains the value of a:
a. Statistic
b. Parameter
c. Both a and b
d. Neither a nor b
2. The null hypothesis is abbrev
STAT 1430
REC 10
SEC 5.1
PROBABILITY
1. The multiplication rule says that if A and B are any two events, P(A and B) =
_
2. If A and B are independent, then what does the multiplication rule look like?
_
3. Say 60% of American households had the playoffs o
Stat 1430
Recitation 22 Solutions
Section 6.1
Confidence Intervals
Instructions: All confidence intervals are 95% unless otherwise indicated. This also
applies on exams.
Suppose you want to estimate a parameter (for this class: the mean of the
population,
STAT 1430
REC 25 (SOLUTIONS)
SEC 8.1
PROPORTIONS
1. Explain what is wrong with each of the following.
a) You can use a significance test to evaluate the hypothesis
H 0 : ^ =0.6 versus the twop
sided alternative.
b) The largesample significance test for a
STAT 1430
REC 25
SEC 8.1
PROPORTIONS
NOTE: ALL CONFIDENCE LEVELS (for confidence intervals) ARE 95% AND ALL SIGNIFICANCE LEVELS (for
hypothesis tests) ARE 5% UNLESS OTHERWISE STATED.
1. Explain what is wrong with each of the following.
a) You can use a si
STAT 1430
REC 11
SEC 5.1
PROBABILITY
(Show all of your work to get credit  work means correct notation, not just numbers!)
1. Consider the experiment where a student rolls a sixsided die with the sides labeled 1
through 6, and each number is used exactl
STAT 1430
1.
Recitation 24
Sections 4.4 6.2 Extra Practice
a. You have performed a twosided test of significance and obtained a test statistic of
z=1.98. What is the pvalue for this test?
b. You will perform a significance test of
H 0 : =0
vs
H A : >0 a
LAST 1430 LECTURE: PRACTICE NEW MATERIAL AFTER M2 SOLUTIONS
1.
The 40th percentile of the standard normal (Z) distribution occurs at the number Z =
0.40.
a. True
2.
b. False
A supermarket has determined that daily demand for egg cartons has a normal
distr
LAST 1430 LECTURE: PRACTICE NEW MATERIAL AFTER M2
1.
THE NORMAL DISTRIBUTION
a. True
The 40th percentile of the standard
normal (Z) distribution occurs at the
number Z = 0.40.
b. False
2.
A supermarket has determined that daily demand for egg cartons has
STAT 1430
MIDTERM A SP 15
SOLUTIONS
For the next 4 problems: Researchers are studying the relationship between the lengths (cm) and
weights (grams) of 57 perch caught in a lake in Finland. Suppose the researchers have failed to
check the proper conditions
STAT 1430
MIDTERM B SP 15
NAME (PRINTED)_
NAME (SIGNED)_
GROUP NUMBER_
DAYS MY RECITATION MEETS (NOT LECTURE!)_
TIME MY RECITATION MEETS (NOT LECTURE!)_
TOTAL NUMBER OF POINTS ON THIS EXAM: 150. THERE ARE 30 PROBLEMS; IT IS
YOUR RESPONSIBILITY TO MAKE SUR
STAT 1430
MIDTERM B SP 15
SOLUTIONS
1.
Suppose A and B are independent. If P(A) = 0.25 and P(A and B) = .10, what is P(B)?
a. 0.25
b. 0.40 since P(A and B) = P(A)*P(B) if A and B are independent.
c. 0.15
d. Cannot be determined from the information given
STAT 1430
MIDTERM A SP 15
NAME (PRINTED)_
NAME (SIGNED)_
GROUP NUMBER_
DAYS MY RECITATION MEETS (NOT LECTURE!)_
TIME MY RECITATION MEETS (NOT LECTURE!)_
TOTAL NUMBER OF POINTS ON THIS EXAM: 150. THERE ARE 30 PROBLEMS; IT IS
YOUR RESPONSIBILITY TO MAKE SUR
Some Practice Questions for the Final
SOLNS
Note: your exam will be different from this one and it will be longer. Study all your materials, not
just this exam!
1.
P(Z < 2.74) = P(Z > 2.74)
a. Yes
b. No
2.
Bobs Zscore on an exam is 0.25. What is the cor
Some Practice Questions for the Final
Note: your exam will be different from this one and it will be longer. Study all your materials, not
just this exam!
1.
P(Z < 2.74) = P(Z > 2.74)
a. Yes
b. No
2.
Bobs Zscore on an exam is 0.25. What is the correct i
STAT 1430
REC 6
SEC 2.12.2
SCATTERPLOTS AND CORRELATION
1. Scatterplots examine relationships between two
variables
2. Three important things to look for when you INTERPRET a scatterplot:
a)
b)
c)
3. Correlation is a measure of the strength and direction
STAT 1430
REC 5
SEC 3.2
EXPERIMENT
Suppose we want to study and compare the volume of popcorn produced by two brands of
microwave popcorn. We will take 30 bags of popcorn of brand A and 30 of brand B and cook
them various amount of time in a random order
Stat 1430 Recitation Solutions
4B
Regression
Regression (Part 1) (SOLUTIONS)
We are comparing years of education and hours on the internet in the last month, to see
if a relationship exists. If a relationship does exist, we want to predict Internet use us
STAT 1430
Recitation 2B
SOLUTIONS
MC/TF
HISTOGRAMS, GRAPHS, MEAN, MEDIAN
1. In general, can you recreate the original data values from its histogram?
a. Yes
b. No
2. We know that if a histogram is skewed left, then the mean is less than the median.
WHY?
a
Stat 1430
Recitation 6B
Probability Rules Part 2
SOLUTIONS
1. The following table shows data from a random sample of 100 drivers
who own cars. Number of speeding tickets in the last 6 months, and
whether or not they drive a fast car were recorded. (Fast c
STAT 1430
REC 5A SOLUTONS
REGRESSION
1. Why is Total U.S. Box Office Revenue considered the Y (dependent) variable in this
case?
Total U.S. Box Office Revenue is the one that is being predicted.
2. We need to find a good X (independent) variable to help u
STAT 1430
Scatterplots & Correlation
REC 4A SOLUTIONS
Basics of correlation:
1. Scatterplots examine relationships between what type(s) of variables?
a) Categorical
b) Quantitative
c) Both categorical and quantitative variables
2. Correlation is a measure