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Lab section number
S'IAT/MATH 212 (Sections 1 -6. 1 3-1 5)
LAB ASSIGNMENT
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Introduction to the lab and to MyStatlab. (No food, no drinks, have fun.)
I. If you have not already done so, register and log in to MyStatlab (MyMathlab).
Your
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Lab
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Stat/Ncfw_ath 212
Sections 1-6, 13-15
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Discuss previous lab, homen ork, and other questions.
Form teams of 2 w 3 to lvork on this lab.
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Hairctrts - \.ho Spends More?
Purpose: To conduci a significance test and
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Laboratory Section
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Review and discuss last week's laboratory.
11.
Individual
work
For this section you are to work by yourself, or with your partner.
For each variable in the following set of var
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HOMEWORK 3
l. In poor countiies- the grorith of children can be an impofiant indicator ol gcneral levels of ntrtrition and
health. Data in the paper 'Thc Osteologicatr Paraclox: Pr
. ln-Class Regression Problem
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- 3. Find the average for x and the average for y
N- 1+5 A 31? ,
/\" '37.? 2. q 3~ T Li's (a
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b. Find pearson correlation coefficient ( r)
m
67.37
218. 00
n 2x3- ixi ('awm
Z Test for the Mean
Data
Null Hypothesis
m =
Level of Significance
Population Standard Deviation
Sample Size
Sample Mean
Intermediate Calculations
Standard Error of the Mean
Z Test Statistic
368
0.05
15
25
372.5
3
1.5
Two-Tail Test
Lower Critical Value
-1
Z Test for Differences in Two Proportions
Data
Hypothesized Difference
Level of Significance
Group 1
Number of Successes
Sample Size
Group 2
Number of Successes
Sample Size
Intermediate Calculations
Group 1 Proportion
Group 2 Proportion
Difference in Two
Z Test of Hypothesis for the Proportion
Data
Null Hypothesis
p=
Level of Significance
Number of Items of Interest
Sample Size
Intermediate Calculations
Sample Proportion
Standard Error
Z Test Statistic
0.3
0.05
320
1000
0.3200
0.0145
1.3801
Two-Tail Test
ConceptsforExam2
*This list is meant to help guide your studying. It may NOT be an exhaustive list.*
Normal Distribution (more in context with distribution of sample mean and sample proportion)
Be able to calculate probabilities for a normal random varia
Selects 140 dealerships randomly, surveys all customers- cluster
Stratified- number of individuals sampled from each stratum should be proportional to the size of the
strata in the population. Grouped, then obtain random sample from each group. 10 compani
Variability in a Distribution
Data
Mean
Standard Deviation
2.06
0.02
Results
1 standard deviations
2 standard deviations
3 standard deviations
% of Values Found in Intervals Around the Mean
Range
2.04
2.02
2.00
2.08
2.10
2.12
Chebyshev Rule (any
distribut
t Test for the Hypothesis of the Mean
Data
Null Hypothesis
m=
Level of Significance
Sample Size
Sample Mean
Sample Standard Deviation
Intermediate Calculations
Standard Error of the Mean
Degrees of Freedom
t Test Statistic
120
0.05
12
112.85
20.8
6.0044
1
Grizelda Samano
Nov 16, 2016
Stats 212 Lab 13
INTRODUCTION
In order to identify if it is cheaper to buy groceries at a Safeway store vs. a
Wal-Mart store, a comparison of two population means using dependent samples
(paired t-test) was used. The paired t-
ConceptsforExam2
*Thislistismeanttohelpguideyourstudying.ItmayNOTbeanexhaustivelist.*
NormalDistribution(more in context with distribution of sample mean and sample proportion)
Beabletocalculateprobabilitiesforanormalrandomvariableusingthenormaltable
Be
Normal Probabilities
Common Data
Mean
Standard Deviation
7
6
Probability for X <=
X Value
Z Value
P(X<=7)
7
0
0.5000
Probability for X >
X Value
Z Value
P(X>9)
9
0.33333333
0.3694
Probability for X<7 or X >9
P(X<7 or X >9)
0.8694
Probability for a Range
F
Paired t Test
Data
Hypothesized Mean Diff.
Level of Significance
0
0.05
Intermediate Calculations
Sample Size
DBar
degrees of freedom
SD
Standard Error
t Test Statistic
Two-Tailed Test
Lower Critical Value
Upper Critical Value
p-Value
Reject the null hypo
"Dow Dogs" Population
Parameters
1Yr-Return
Mean
7.6570
Variance
84.8352
Standard Deviation
9.2106
"Dow Dogs" Population
Parameters
1Yr-Return
Mean
7.6570
Variance
84.8352
Standard Deviation
9.2106
Stock
AT&T
Verizon
Merck
Pfizer
GE
DuPont
Johnson & Johns
For the Mean Sales Invoice Amount
Data
Population Standard Deviation
Sampling Error
Confidence Level
Intemediate Calculations
Z Value
Calculated Sample Size
25
5
95%
-1.9600
96.0365
Result
Sample Size Needed
97
For the Mean Sales Invoice Amount
Data
Popul
For the Proportion of In-Error Sales Invoices
Data
Estimate of True Proportion
Sampling Error
Confidence Level
Intermediate Calculations
Z Value
Calculated Sample Size
0.15
0.07
95%
-1.9600
99.9563
Result
Sample Size Needed
100
For the Proportion of In-Er
Biology 251
6 October 2009
Exam Two
FORM W
PRINT YOUR NAME AND ID NUMBER in the space that is provided on the answer sheet, and then blacken
the letter boxes below the corresponding letters of your name and ID number. You will have 4 points
deducted if yo
Question 1: (Dont Worry about this question)
It is desired to test the claim that a steady diet of wolfbane will cause a
lycanthrope (werewolf) to lose 10 lbs. over 5 months. A random sample of 49
lycanthropes was taken yielding an average weight loss ove
Statistics Project
I investigated the proportion of plants kept outside of tenants apartments and the
proportion of plants kept inside tenants apartments in the Chinook Apartment complex. My
null hypothesis was that H0: p1 = p2, both proportions are equal
Spencer Lane
Professor Alldredge
Stats 212
8 December 2008
Project 2
College is proven to be one of the most stressful and hard times in a persons life. It is a big shock
when a person goes from high school to college. This change can affect can cause man
Difference Sample Mean
1 - 2
Std. Err.
DF
T-Stat
-0.2175 0.10241867 78 -2.1236362
P-value
0.0369
+
Summary statistics:
Colum
n Mean Variance
n
var1
40
var2
40
Std. Dev.
Std. Err.
Media Rang
Min Max Q1 Q3
n
e
2.992 0.2617371
0.0808914
0.5116026
5
7
7
3
2
2
Hypothesis test results:
1 : mean of var1
2 : mean of var2
1 - 2 : mean difference
H0 : 1 - 2 = 0
HA : 1 - 2 0
(with pooled variances)
Difference Sample Mean
1 - 2
Std. Err.
DF
T-Stat
-0.2175 0.10241867 78 -2.1236362
Summary statistics:
Colum
n Mean Varia
Spencer Lane
Prof. Alldredge
Stats 212
23 October 2008
Project 1
In our project, the main area of concern for our study was to gauge how active a person is
versus how many Cougar Football or Basketball games a person attends a season. We further
separated
1. How many Cougar football games do you attend a season?
2. How many Cougar basketball games do you attend a season?
3. Do you attend the rec at least 2 times a week?
4. Do you participate in intramural sports or do you plan on participating in intramura
Lab 10 Spring 2016
Exam 2 Review
1. Assume that z scores are normally distributed with a mean of 0 and a standard
deviation of 1. If P(O < z <a)= 0.3577, find a.
2. Assume that z scores are normally distributed with a mean of 0 and a standard
deviation of
STAT212
Practice Questions for Exam 2
1. An investigator claims that = the average weight of passengers flying on small planes exceeds the FAA guideline of
average total weight of 185 pounds (passenger weight including shoes, clothes, and carry-on). Suppo
STAT212
Exam 2 Summer 2015
Name_
Multiple-Choice Part: Each multiple-choice question is worth 2 points.
1. Which of the following would be an appropriate alternative (research) hypothesis?
A) The mean of a population is less than 55.
B) The mean of a sam