Symbol for the population mean : Formula:
Symbol for the sample mean: Formula:
A. skewed to the right
B. skewed to the left
(positively skewed)
(negatively skewed)
C. symmetric
Population Variance:
2 =
2 =
(NOTE: 2 is read as sigma squared)Sample
Variance
There are two hypotheses being tested:
1.
NULL HYPOTHESIS (H0 H-knot) vs. 2. ALTERNATIVE HYPOTHESIS (HA).
Hypothesis testing parallels a criminal trial where the jury must decide whether the person accused of
the crime is innocent or guilty based on the e
Probability and Sampling
Distributions
Randomness and Probability Models
Sections 4.1 and 4.2
Objectives (Sections 4.1 and
4.2)
Randomness and Probability Models
Randomness and probability
Probability rules
Assigning probabilities: finite number of outcom
1
STAT 2110
HOMEWORK #5 ANSWER KEY-Not Collected
Chapter 1 Section 1.3
The following are answers to the problems that were assigned that will not be
collected. Please see me with any questions.
Exercise 1.80
X~U(a,b)
f ( x)
1
(b a)
0
X~U(0,1)
a xb
1
0
1
STAT 2110 - 24 points
HOMEWORK #5 ANSWER KEY- collected
Chapter 1 Section 1.3
Problem #1
a) (1 pt.) X = amount of time it takes a competitor to complete a certain obstacle course;
X~U(30, 65)
b) (1 pt.)
P ( X 45) (65 45)
1
1
(20) 0.5714
(65 30)
35
c) (
Section1.3DensityCurvesandtheNormal
DistributionsPart2LAB
The 68-95-99.7 rule
Since the normal distribution is symmetric, the approximate percentages may
be drawn as:
The689599.7rulealsoappliestosampledata.
Example 4
Themeanweightof200sevenyearoldboysis56
STAT 2110
HOMEWORK #4
Chapter 1 Section 1.3
Completion date: Thursday, February 5
Read pages 41-48 in the textbook.
The following problems will not be collected. Check your answers with the
answer key on Blackboard and see me with any questions.
APPLY YOU
Wenjie Sima Teaching Assistant for STAT2110 section 1001 and 1002
Homework #2 Solution
(10 Points)
Type your name and class Section at the top of the header of your Word file.
For each graph that you create, type your name in the Footnote 1 box.
Paste all
Homework 1 Solution
(10 points)
Download Data from Class Survey: CLASS-DATA-FALL2015.MTW
Download this file to your Desktop by going to Files, Chapter 1-1. Click on CLASSDATA-FALL2015.MTW. You may have to then click on the file on the bottom left of
your
Exam I Review
Common Mistakes
Check outlier
Ex: Yes. 45 is an outlier, since 45 3 = 19 > 1.5 = 16.5 (from Quiz 1)
Write down probability statement for any probability problem
Ex: P(2<X<5), P(A and B)
Define the random variable of interest and give its dis
WAREN SPORTS SUPPLY, YEAR-END WORKSHEET, DECEMBER 31, 2009
TRANSACTIONS LIST A
(Accounts with no activity in this worksheet are excluded in this solution.)
12/31/2008
ACCT
ACCOUNT
POST CLOSING
NO.
TITLE
TRIAL BALANCE
DEBIT
CREDIT
Student Name_
Instructor_
Jake Kanter
STAT 2110
11:30
Problem 1
X = the average number of rounds of golf played per year by 12 randomly selected physicians
X~N, X-bar ~N (=?, x-bar= 12/12 = 3.4641)
Sample mean:
Margin of error:
3
41
17
1
33
37
18
15
17
12
29
51
22.8333
6.7895
Uppe
Homework 1
Yuntao Xu
STAT 2110
Exercise 1 (2 Points)
Here are some question topics from school. Sort them according to whether they will yield
categorical or numerical data.
Amount of money earned last week Language
mostly
spoken
at
home
Dominant
hand
rea