Hypothesis, ci, and regression – critical 13 selected multi part

Sample questions:

 

Total Marks = 63

Please show all your work. Some questions require you to use graphs, tree diagrams, formulas, and so on that are difficult or impossible to reproduce in word-processing programs, so you will haveto print the entire assignment and fill it out and mail it to your tutor. As an alternative to mailing, you might be able to photograph or scan your assignment and submit it through the appropriate drop box. If you do, make sure the material you are submitting is legible.

A manufacturer of exercise bicycles is studying the relationship between the number of months an exercise bicycle has been owned and the length of time it was used last week. Data for a random sample of 7 owners are provided in the table below

Months Owned

Hours Used Last Week

14

6

  8

8

  5

7

  3

9

10

6

  4

8

12

7

                                                     

4 marks                   a.    Construct a scatter diagram for these data with “Months Owned” on the horizontal  axis, and “Hours Used Last Week” on the vertical  axis.

Note: Try to make relatively full use of the graph area.

                           2 marks         b.    Describe the general pattern of the relationship between the two variables.

                           11 marks       c.     Calculate the least squares regression line with hours used as the dependent variable and months owned as the independent variable.

                                                             Note: Express a and b to 4 decimal places of accuracy.

                           3 marks         d.    Plot the regression line on the scatter diagram you constructed in part (a).

                                                             Note: Show your calculations for  and

.

10 marks        e.         Can it be concluded that the slope of the regression line is negative? Formulate and test the appropriate hypotheses at the 5% significance level. Use the critical value approach.

                           4 marks         f.     Construct a 95% confidence interval for B.

 

                           2 marks         g.    Interpret the numerical value of b in the sample regression line. What does it mean in the context of this question?

 

                           2 marks         h.    Use the equation of the regression line to predict hours used last week if an exercise bicycle has been owned for 11 months.

                                                             Note: Express your answer to 2 decimal places of accuracy.

An ice cream vendor would like to predict daily sales of ice cream cones based on the temperature outdoors. Data for a random sample of 8 days are provided in the table below.

Temperature (°C)

Daily Sales (Litres)

  6

135

  8

  50

12

125

16

100

18

200

22

150

28

250

28

175

The regression line with “daily sales” as the dependent variable and “temperature” as the independent variable has been calculated as:

                                                            

You may use the following sums of squares and cross products for the questions below.

                           2 marks         a.    Interpret the value of bin the sample regression line. What does it mean in the context of this question?

 

                           2 marks         b.    Compute the linear correlation between “daily sales” and “temperature.”

                                                     Note: Express your answer to 4 decimal places of accuracy.

 

            8 marks          c.         At the 5% significance level, can it be concluded that the correlation between daily sales and temperature is positive? Formulate and test the appropriate hypotheses. Use the critical value approach.

 

                           2 marks         d.    What percentage of the variation in daily sales is explained by its linear relationship with temperature?

 

                           11 marks       e.    Using the regression line and sums of squares and cross products provided above, construct a 90% prediction interval for daily sales when the outside temperature is 24°C.

 

 

 Details of all the selected problems are given in attached word file.

Place your order
(550 words)

Approximate price: $22

Calculate the price of your order

550 words
We'll send you the first draft for approval by September 11, 2018 at 10:52 AM
Total price:
$26
The price is based on these factors:
Academic level
Number of pages
Urgency
Basic features
  • Free title page and bibliography
  • Unlimited revisions
  • Plagiarism-free guarantee
  • Money-back guarantee
  • 24/7 support
On-demand options
  • Writer’s samples
  • Part-by-part delivery
  • Overnight delivery
  • Copies of used sources
  • Expert Proofreading
Paper format
  • 275 words per page
  • 12 pt Arial/Times New Roman
  • Double line spacing
  • Any citation style (APA, MLA, Chicago/Turabian, Harvard)

Our guarantees

Delivering a high-quality product at a reasonable price is not enough anymore.
That’s why we have developed 5 beneficial guarantees that will make your experience with our service enjoyable, easy, and safe.

Money-back guarantee

You have to be 100% sure of the quality of your product to give a money-back guarantee. This describes us perfectly. Make sure that this guarantee is totally transparent.

Read more

Zero-plagiarism guarantee

Each paper is composed from scratch, according to your instructions. It is then checked by our plagiarism-detection software. There is no gap where plagiarism could squeeze in.

Read more

Free-revision policy

Thanks to our free revisions, there is no way for you to be unsatisfied. We will work on your paper until you are completely happy with the result.

Read more

Privacy policy

Your email is safe, as we store it according to international data protection rules. Your bank details are secure, as we use only reliable payment systems.

Read more

Fair-cooperation guarantee

By sending us your money, you buy the service we provide. Check out our terms and conditions if you prefer business talks to be laid out in official language.

Read more