Question

Part 1: z-Procedures In this part, we will use z-procedures. z-procedures are both confidence intervals and hypothesis tests that use a Normal distribution. They are called z-procedures because they rely on a z-test statistic and/or a z-critical value. So far, we can use z-procedures for a population mean knowing the population standard deviation. In Part 1, you will use the data file TempSample00-18.

(THIS IS DATA) YEAR,Month,High Temperature

2000,Jan,45

2000,Jan,48

2001,Jan,49

2003,Jan,62

2003,Jan,53

2004,Jan,42

2004,Jan,47

2005,Jan,40

2005,Jan,47

2006,Jan,48

2006,Jan,47

2007,Jan,51

2007,Jan,34

2007,Jan,47

2009,Jan,50

2011,Jan,35

2012,Jan,44

2013,Jan,38

2013,Jan,53

2013,Jan,42

2014,Jan,58

2014,Jan,47

2014,Jan,44

2015,Jan,52

2016,Jan,44

2017,Jan,49

2018,Jan,54

2000,Feb,48

2001,Feb,47

2004,Feb,47

2007,Feb,51

2008,Feb,51

2008,Feb,55

2011,Feb,45

2014,Feb,37

2014,Feb,54

2014,Feb,58

2015,Feb,54

2017,Feb,52

2017,Feb,44

2017,Feb,45

**Part 1: z-Procedures**

**1.1 Getting Started**

**1.1.1 Understanding the Set-Up**

**1) Describe the intended population?**

**The intended population is the months of January and
February**

**2) Describe the sample?**

**3) Describe the variable of interest?**

**4) Describe the parameter of interest (in
context)?**

**5) Describe the statistic of interest (in context)? Give
a numerical value along with your description. Round to two decimal
places.**

**1.1.2 Checking Conditions**

**1) Check that the conditions for using z-procedures are
satisfied. If they are not, discuss whether or not it is reasonable
to use z-procedures.**

**1.2 Confidence Intervals**

**1.2.1 Motivating Question: Confidence
Intervals**

**In 1.2, we will try to answer the question:**

**What is the average daily temperature high in Portland,
OR for the months of January and February during
2000-2018?**

**1.2.2 Confidence Interval**

**1) What critical value is used to compute a 95%
confidence interval?**

**2) Give the 95% confidence interval. Round to two
decimal places.**

**3) Interpret your 95% confidence interval**

**1.2.3 Wrap Up**

**1) Answer the motivating question in 1.2.1.**

**1.3 Hypothesis Tests (Tests of
Significance)**

**1.3.1 Motivating Question: Hypothesis Tests**

**In 1.3, we will try to answer the question:**

**Is there evidence to suggest that the average daily
temperature high in Portland, OR for the months of January and
February during 2000-2018 is different than the historical average
of 48.35◦F?**

**1.3.2 Hypothesis Test**

**1) Perform a hypothesis test for α = .01. Be sure to
interpret your p-value in context.**

**1.3.3 Wrap Up**

**1) Answer the the motivating question in
1.3.1.**

**1.4 Final Remarks**

**1) Based on your work in Part 1, what would you say
about the daily high temperature for “recent” years compared to
“historical” years?**

Answer #1

In what follows use any of the following tests/procedures:
Regression, confidence intervals, one-sided t-test, or two-sided
t-test. All the procedures should be done with 5% P-value or 95%
confidence interval.
Use the same MathCreditsSalary data.
SETUP: Is it reasonable to claim that people who
took more than 10 math credits will have average salary of 41000 or
more?
5. What test/procedure did you perform?
a. One-sided t-test
b. Two-sided t-test
c. Regression
d. Confidence interval
6. What is the P-value/margin...

n what follows use any of the following tests/procedures:
Regression, multiple regression, confidence intervals, one sided
T-test or two sided T-test. All the procedures should be done with
5% P-value or 95% confidence interval.Some answers are
approximated, choose the most appropriate answer.
Open Pollution data. SETUP: Is it reasonable to claim that cities
with precipitation of less than 100 days have average temperature
of less than 65 degrees F? Given the data your job is to confirm or
disprove this...

In what follows use any of the following tests/procedures:
Regression, multiple regressions, confidence intervals, one-sided
t-test or two-sided t-test. All the procedures should be done with
5% P-value or 95% confidence interval.
Upload the data HeartRate_Exercise. These data are based on 45
randomly chosen high school students.
SETUP: Is it reasonable to claim that students who
exercise more have lower heart beat rate at rest. Given the data
your job is to confirm or disprove this claim.
5. What test/procedure...

please answe all parts of question 4
Year
Period
Division
Revenue
Number of Customer
2000
1
A
706
333
2000
1
B
151
195
2000
1
C
460
222
2001
1
A
879
252
2001
1
B
619
256
2001
1
C
361
376
2002
1
A
260
519
2002
1
B
302
788
2002
1
C
250
62
2003
1
A
588
67
2003
1
B
862
752
2003
1
C
966
250
2004
2
A
724
638
2004...

Part II
We will use the “Twins Data” tab in the workbook.
1) Single Variable
a) Create a Scatterplot of “Wins” and “Runs” (You might need to
rescale the axis for each)
b) Run a Regression with “Wins” as y and “Runs” as x
c) What is your model? Slope t-value? F-Value? R squared?
2) Multivariable
a) Traditional Stats
Run a regression with “Wins” as the y variable and both “Batting
Average” and “ERA”
as the...

Part 1
John, the supply chain director, explains to the management team
that product availability does not only depend on production
capacity, but also on proper DC operations.
The company has one DC in Kansas that has the potential to face
disruptions due to natural phenomena (usually tornadoes). John has
gathered data from past 52 years on how many times a year the DC
has faced disruptions and had to stop its operations (Table 1).
Table 1: Number of disruptions...

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