Question 1
1.
The population standard deviation of the number of people who shop
online is 3.1. If you want to be 95% confident that the sample mean is within
3% of the population mean, how many people must be surveyed?
2 points
Question 2
1.
The populati
Question 1
1.
According to government data, the probability than an adult
was never married is 15%. You randomly select 50 adults and ask if
he or she was ever married. Decide whether you can use the normal
distribution to approximate the binomial distrib
Question 1
1.
On a cold winter day, the probability that a person wears a hat
is 0.61. The probability that a person wears gloves is 0.32. The
probability that a person wears a hat and gloves is 0.25. What is the
probability that a person wears a hat or g
306150-app-Brase-HMC 8/11/05 05:06 PM Page A1
Appendix
Tables
1. Random Numbers
2. Binomial Probability Distribution
Cn,r prqnr
3. Areas of a Standard Normal
Distribution
4. Critical Values for
Students t Distribution
5. The 2 Distribution
TABLE 1 Random
Question 1
0 out of 2 points
To answer this question, you must use the furnace.mtw file which
you can download here.
Use the tally command (Stat > Table > Tally individual variables)
and select both Count and Percent.
Tally the following column: CH.Liner
Question 1
1 out of 1 points
Given events A and B are independent.
P(A) = 0.314
P(B) = 0.624
What is P(A and B)?
Selected
Answer:
0.196
Correct
Answer:
0.1959
0.05
Question 2
1 out of 1 points
Given only the hearts from a deck of cards, what would the
s
Question 1
1 out of 1 points
What visualization tool is useful for detecting patterns and extreme values
in quantitative data by organizing and grouping the data, but allows one
to recover the original data if desired?
Selected
Answer:
stem-and-leaf displ
Question 1
2 out of 2 points
A population has a standard deviaion = 21.3. How large a
sample must be drawn so that a 90% confidence interval for will
have a margin of error equal to 2.5?
Selected
197
Answer:
Correct
197
Answer:
Answer range 4 (193.0 +/20
Copy of
Which formula do you use to solve the following problem. DO NOT
SOLVE THE PROBLEM!
The mean cost of a dinner at a Christmas party at Terry Hills (a local
Batavia restaurant) is $27.37 with a standard deviation of $5.29.
What is the probability th
Question 1
0 out of 2 points
Using the table for the areas of a standard normal distribution, if z
= -0.33, then the area is _. (Use 4 decimal
places)
Selected
.0004
Answer:
Correct
0.3707
Answer:
Answer range 0 (0.3707 +/0.3707)
Question 2
0 out of 2 poi
Question 1
1 out of 1 points
Ten percent of the population is left-handed. In a class of 100 students,
write the binomial probability for the statement "There are fewer than
12 left-handed students in the class."
Selected
Answer:
Answers:
P(x <
12)
P(x =
Question 1
2 out of 2 points
In a continuous random variable, the probability can be represented
by _.
Selected
Answer:
the area under the
curve
Answers:
the area above the
curve
the length of the
number line
the area under the
curve
a histogram
Question
Question 1
1 out of 1 points
You are given a sample size n = 52. You are asked for a 99%
confidence interval. What value of t or z do you use?
Enter only the value, not the letter t or z.
Selected
2.58
Answer:
Correct
2.58
Answer:
Answer range 0 (2.58 +/
Webinar 6
December 4, 2015
Where are we?
Heaven only knows!
Grading
Hypothesis Testing
3 types
Mean, n > 30
Mean, n < 30
proportion
Error
Hypothesis Testing
Building a Ho and Ha
Example
A trucking firm suspects that the mean
life of a certain tire
This is the part of the course I like to think as -finally - "really doing statistics"! But you need all
the background work we've done so far to get to
this and for it to (hopefully) make sense.
This chapter doesn't have a lot of new math, but
it has a b
Webinar 7
December 10
Whats Next?
Still lots of work to do
Quizzes 9, 10
Final
Any last Minitabs
Final
Closes midnight on Monday
FIRM FIRM FIRM FIRM
Watch the directions
Include Z values
Include E values
Use Minitab
Grading
Chapter 12
Correlation
646
APPENDIX
14.5 Solution Sheets
14.5.1 Solution Sheet: Hypothesis Testing for Single Mean and Single Proportion9
Class Time:
Ho has the
equality and
Ha is the
complement
Name:
d. Are you
using
means (z),
means (t) or
proportions
?
a. Ho :
b. Ha :
c. In
Question 1
1.
Find the P value for the indicated hypothesis test with the
given standardized test statistic z. Decide whether to reject Ho for
the given level of significance.
Left tail test, z = -1.55, alpha = 0.05
Value of P: Blank 1
- use 4 decimal pla
Question 1
1.
The critical value z for a two tailed test, when = 0.05 is
_
1.9
6
2.5
8
1.6
45
2.3
3
2 points
Question 2
1.
The critical value z for a left tailed test, when = 0.01 is
_
-2.33
1.64
5
2.33
1.64
5
2 points
Question 3
1.
When > p, the decision
Judith Elwell
Minitab 9
4/20/2016 9:44:24 AM
Welcome to Minitab, press F1 for help.
Descriptive Statistics: C1
Variable
C1
N
100
N*
0
Mean
50.160
SE Mean
0.762
StDev
7.622
Minimum
32.000
Q1
45.000
Median
50.000
One-Sample Z: C1
Q3
56.000
Test of = 49 vs
Test 2 Acct 2301 Summer 2005 Chapters 9-12
Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. _ 1. If title to merchandise purchases passes to the buyer when the goods are delivered to the buyer, t