The vice president of purchasing for a large national retailer

9. The vice president of purchasing for a large national retailer has asked you to prepare
an analysis of retail sales by state. Data are available for the following variables:
Y (retsal) = Per capita retail sales in $
X1 (perinc) = Per capita personal income in $
X2 (unempl) = Unemployment rate in %
X3 (totpop) = State population in 000s
Excel regression output of a potential model is:
Regression Statistics
Multiple R 0.673063624
R Square 0.453014642
Adjusted R Square 0.430223585
Standard ErrorNNN-NN-NNNN
Observations 50
df SS MS F Significance F
Regression 2 14931938.3(NNN) NNN-NNNN149 19.87686003 5.14537E-07
Residual 47 18029332.53(NNN) NNN-NNNN
Total 49 32961270.82
Coefficients Standard Error t Stat P-value Lower 95% Upper 95%
Intercept 3054.280348(NNN) NNN-NNNN4.216390382 0.000109151 1597.811292 4510.749404
unempl -86.25168104 40.20459701 -2.14531888 0.037015057 -167.0884398 -5.414922307
perinc 0.253683705 0.048149492 5.268668342 3.2101E-06 0.156872664 0.350494746
(a) Comment on the e ects of unemployment and per capita personal income.
(b) You think the prediction equation can be improved by adding state population
as an additional explanatory variable. You obtained the following output:
Regression Statistics
Multiple R 0.687861707
R Square 0.473153727
Adjusted R Square 0.439525242
Standard Error(NNN) NNN-NNNN
Observations 50
df SS MS F Significance F
Regression 3 15595748.15(NNN) NNN-NNNN716 14.07002785 1.12578E-06
Residual 46 17365522.67(NNN) NNN-NNNN
Total 49 32961270.82
Coefficients Standard Error t Stat P-value Lower 95% Upper 95%
Intercept 2828.429295(NNN) NNN-NNNN3.832870736 0.000375307 1343.885177 4312.973414
unempl -71.32832666 41.40025242 -1.722895936 0.091481858 -154.6148904 11.95823702
perinc 0.272491364 0.049773611 5.474615138 1.66335E-06 0.172359776 0.372622951
totpop -0.024730373 0.018450316 -1.340376626 0.186566538 -0.061847621 0.012386875
i. Is this model better? Why/why not?
ii. For this model, write out an expression for sales.
iii. For this model, calculate a 95% con dence interval for predicted sales,
if unemployment is 8.1%, per capita income is $15,000 and the state’s
population is 6 million. Use a z-value of 1.96.
(c) Write down two additional explanatory variables which you think could help to
explain sales. Give a brief justi cation for each.
(25 marks)
10. (a) Time series are usually considered to have a combination of four components.
What are these components? For each of them, give one example of data for
which you would expect that component to be present.
(b) The following table gives average UK household electricity demand in kilowatt
hours (kWh) over the last ve years. Quarter 1 represents Spring.
Year Q1 Q2 Q3 Q4
2005 4.5 4.1 4.4 5.1
2006 4.9 4.6 4.6 5.3
2007 5.0 4.7 4.8 5.5
2008 5.2 5.0 5.1 5.6
2009 5.3 5.1 5.2 5.7
i. State two features about household electricity demand that are apparent
from these data.
ii. Show that the 4-point centred moving average for Quarter 3 in 2007 is
iii. Calculate the ratio-to-moving-average (R2MA) for Quarter 3 in 2007.
iv. Compute the four seasonal indices using the following table of R2MA
values. Replace `?’ with your answer to part `iii.’.
Season Autumn Winter Spring Summer
0.961749 1.088000 1.026178 0.953368
0.946015 1.084399 1.015228 0.944724
? 1.081081 1.007264 0.959233
0.973747 1.064133 1.002364 0.960000
Seasonal averages * 1.079403 1.012759 0.954331
v. The estimated trend line is found to be:
^y = 4:461 + 0:050x;
where x is the Quarter number (Q1 of 2005 corresponds to x = 1). Provide
a forecast, to three decimal places, for average UK household electricity
demand for the summer of 2015. Do you have any comment to make about
this forecast?

Don't use plagiarized sources. Get Your Custom Essay on
The vice president of purchasing for a large national retailer
Just from $13/Page
Order Essay

Place Order
Grab 16% Discount On This Paper
Pages (550 words)
Approximate price: -

Why Choose Us

Quality Papers

We value our clients. For this reason, we ensure that each paper is written carefully as per the instructions provided by the client. Our editing team also checks all the papers to ensure that they have been completed as per the expectations.

Professional Academic Writers

Over the years, MyEssay.Help has managed to secure the most qualified, reliable and experienced team of writers. The company has also ensured continued training and development of the team members to ensure that it keep up with the rising Academic Trends.

Affordable Prices

Our prices are fairly priced in such a way that ensures affordability. Additionally, you can get a free price quotation by clicking on the "Place Order" button.

On-Time delivery

We pay strict attention on deadlines. For this reason, we ensure that all papers are submitted earlier, even before the deadline indicated by the customer. For this reason, the client can go through the work and review everything.

100% Originality

At, all papers are plagiarism-free as they are written from scratch. We have taken strict measures to ensure that there is no similarity on all papers and that citations are included as per the standards set.

Customer Support 24/7

Our support team is readily available to provide any guidance/help on our platform at any time of the day/night. Feel free to contact us via the Chat window or support email:

Try it now!

Grab 16% Discount On This Paper

We'll send you the first draft for approval by at
Total price:

How it works?

Follow these simple steps to get your paper done

Place your order

Fill in the order form and provide all details of your assignment.

Proceed with the payment

Choose the payment system that suits you most.

Receive the final file

Once your paper is ready, we will email it to you.

Our Services has stood as the world’s leading custom essay writing services providers. Once you enter all the details in the order form under the place order button, the rest is up to us.


Essay Writing Services

At, we prioritize on all aspects that bring about a good grade such as impeccable grammar, proper structure, zero-plagiarism and conformance to guidelines. Our experienced team of writers will help you completed your essays and other assignments.


Admission and Business Papers

Be assured that you’ll definitely get accepted to the Master’s level program at any university once you enter all the details in the order form. We won’t leave you here; we will also help you secure a good position in your aspired workplace by creating an outstanding resume or portfolio once you place an order.


Editing and Proofreading

Our skilled editing and writing team will help you restructure you paper, paraphrase, correct grammar and replace plagiarized sections on your paper just on time. The service is geared toward eliminating any mistakes and rather enhancing better quality.


Technical papers

We have writers in almost all fields including the most technical fields. You don’t have to worry about the complexity of your paper. Simply enter as much details as possible in the place order section.

                                                                                     Place Order macbook tamir - mersin escort - - bahis