1
Introductory Statistics
By: OpenStax
Online: <http:/legacy.cnx.org/content/col11562/1.17>
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Review Problems classes 04, 05 Fall 2016
Problem 1) A local restaurant, Excellent Eats, is interested in how long it takes its customers to get
served, so it collects data over a long time period for many servers. It finds that the time until service is
a
Quiz 2, January 26, 2017, 5 points )4 Ey
Here is a small part ofa data set that describes the fuel economy (in miles per gallon) of model year 2013 vehicles:
Make and 1 vehicle type transmission l number of city highway C02 emitted f
A set of exam scores is converted to standard normal 2 scores. Answer the following based on the standard normal 2
distribution- % \l N50) 5
Question 1) What proportion of z scores are between -O.57 and 1.84?
[email protected]< Eflkgfs
Quiz 4, September 22, 2016. 5
AST 311
Homework 1 Key, page 1 of 6
Problem 1)
A) The individuals are the countries.
The variable is CO2 emissions measured in metric tons per person, quantitative.
B) Countries with larger populations would likely have higher C02 emissions simply because
AST 311
Homework 2 List, page 1 of 2
Problem 1) Heights of babies in age from 14 months are approximately normally distributed with an average of 65 cm
() and standard deviation of 10 cm (). Let X be the height of one baby. For parts a-f:
Step 1. State th
AST 311
Hwk 1 list of problems, Page 1 of 2
Directions:
SHOW ALL WORK AND FORMULAS! This is very important for full credit.
Please staple your work and be neat.
Thank you for helping me and the TAs so that you earn all of the points you deserve.
Proble
AST 311
Hwk 1 list of problems, Page 1 of 2
Directions:
SHOW ALL WORK AND FORMULAS! This is very important for full credit.
Please use your name that corresponds with your name in the Canvas roster until we
get to know you.
Please staple your work and
Probability
Probability
Table entry for z is
the area under the
standard normal curve
to the left of z .
Table entry for z is
the area under the
standard normal curve
to the left of z .
z
z
TABLE A Standard normal probabilities (continued)
TABLE A Standar
AST 311
Homework 2 Key, page 1 of 8
Problem 1) Note that P is short for proportion. Later in the course, we will see that the proportion of
observations in a specific range under a density curve is equivalent to the probability of those observations
occur
AST 311
Homework 2 List, page 1 of 1
Problem 1) The Virginia Cooperative Extension reports that the mean weight of yearling Angus steers is 1152 pounds.
Suppose that the weights of all such animals can be described by a normal model with a mean of 1152 po
-Chapter 6 Notes Part 2
Homework
6-3: #1], l3, 16,21,22
6-4: #5, 7, ll
Concepts: Central Limit Theorem
Draw an SRS of size n from any population with mean ,u and finite standard deviation
0. The central limit theorem says that when n is large the sampli
Homework
7-1: #11, 12.17.21
7-2: #116,9 12
7-3: #519, 15 17
Concepts: Confidence intervals for 0 Known
A point estimate is a specific numerical value estimate of a parameter. The best point estimate of
the population mean ,u is the sample mean )f .
Suppos
Spring 2015
Concepts: Confidence Intervals and Hypothesis testing with a z score where a is known:
Assumptions: For this test you need to have a random sample of n 2 30 and 0' known.
Confidence Intervals: SJéQ
a
1. The interval often has bounds: Bounds
mute
_ a
lll [K Chapter 8 Notes
8-2: #7, 9, 12, 17. 20
8-3 #5,7, 13,15,16
8-4 #9, 15
CONCEPTS: Hypothesis Testing (z-test for a mean, 0' is known)
Assumptions:
1. The sample is a random sample.
2. Either 12230 OR the population is normally distributed if
HOMEWORK
2.1, # 7,18 1 3955 Ni
2.2: # 2, 4, 7, 15 to For. N
2.3: # 3,8,11,16,18
2.4: # 9, 11 'J '
Example #1: The table below to the right gives the I late I .
average travel time to work for workers in each state who I 25.1, I
are at least 16 years old
éoucepts: Condence Intervals with Proportions
an
1. The interval has bounds: Bounds = iE (Margin of Error), where E = zl - £9- .
2. For hypothesis testing:
a. Setup hypothesis:
Rim-raucous:
pPu
b. use the test statistic 2:
{Page
I:
Review Part
W a
. .
.mf? '
\!E[
C j g
91: #9, 17
9-2: #3.
Clipt Rev: #3 (page 521)
9-3: #5, 9
9-4: #1 1. l4
Concepts: Difference between two means using :resr (0" and 0'2 known)
Asstmtptfons:
, 1. Both samples are random.
2. The samples must be independent of each o
H5 populai t l:- cm
iii-x Putative»: 0w "\_
Chapter 11 Notes
11-1: #9, 12
Concepts: Test for Goodness of Fit
STEP E: State the hypothesis and identify the claim.
STEP 2: Find the critical value. The test is always right tailed.
STEP 3 Compute the test val
Chapter 3 Notes
3.1: #5,9,14,21,27
3.2: #8,9, 19,20, 30 ,
3.3: #ll,13,14,18,19, 30a,b,e X "=7 -x
3.4; #3,9,13, 14 /.1,
Concepts: (Mean, Median Mode, Five Number Summary)
The m_ea§ is another word for average.
The mode is the most frequently occurring. (NO
The chart below gi es some brief statistics a out the br 1 kdown of American sol ' waste and our
' cling habits.
a. Would a pic hart be acceptable
for perc r cycled? Explain.
b. Wh' ercen of glass is NOT recycl d per year?
c. If you were c ating a pie ch