# DU Business Statistics Inference for Counts Questions

1.Are food delivery apps equally popular? A 2019 study asked

160

Don't use plagiarized sources. Get Your Custom Essay on
DU Business Statistics Inference for Counts Questions
Just from \$13/Page

U.S. adults who regularly use a food delivery app which one they used most recently. The results are shown in the table below.

160

 App Count DoorDash 44 Grubhub 43 UberEats 40 Other 33 Total

Research Question: Does this study provide evidence that the food delivery apps are not equally likely among U.S. adults who regularly use a food delivery app?

Ho:Ha:

b.How many of the 160 players do we expect to see make each of the choices if the choices are equally distributed among the four options? (1 pt)

c.Bonus Question:Find the chi-square test statistic for investigating this research question by hand. Show your work to receive full credit. If you’d like, you can show your work on paper, take a picture, and insert the picture here. (2 pts)

d.Carry out the goodness-of-fit test in StatCrunch and find the p-value for investigating this research question (include a screenshot of your StatCrunch output showing the correct p-value to receive credit). (2 pts)p-value: Paste a screenshot here

e.Write a conclusion in the context of the research question. (2 pts)

2.Cocaine addiction is very hard to break. Even among addicts trying hard to break the addiction, relapse is common. A relapse is when a person trying to break out of the addiction fails and uses cocaine again. A study was conductd to investigate the effectiveness of two drugs, desipramine and lithium, in the treatment of cocaine addiction. The subjects in the six-week study were cocaine addicts seeking treatment. The 72 subjects were randomly assigned to one of three groups: desipramine, lithium, or a placebo, with 24 subjects in each group. Ten of the subjects taking desipramine relapsed, 18 of the subjects taking lithium relapsed, and 20 of those taking the placebo relapsed.

The researcher is interested in whether the proportion of subjects who relapse differs depending the treatment group.

• Complete the two-way table of the data below, including the row and column totals. (2 pts)

Total

Total

 Treatment Group Relapse No Relapse Desipramine Lithium Placebo

b.Find the relevant conditional proportions (i.e., find the proportion that relapsed in each group). (1 pt)Relapse | Desipramine =

Relapse | Lithium =

Relapse | Placebo =

c.Recall the research question as stated up above. Convert this research question into a null and alternative hypothesis. You can write the hypotheses using either words or symbols. (2 pts)Ho:Ha:

d.Use StatCrunch to carry out the chi square test for independence to obtain an exact p-value for this investigation. Clearly state the p-value, and copy and paste the StatCrunch output from the test below. (3 pts)p-value:Copy and paste screenshot here

e.Use the p-value from part d to evaluate the evidence and draw a conclusion based on this test, and write this conclusion in the context of the problem. (2 pts)

f.Find a 95% confidence interval for difference in the proportion who relapse in the Lithium group compared to the Placebo group. (2 pts)

Upper limit:

Lower limit:

g.Based on the confidence interval found above, can we conclude a statistically significant difference exists in the proportion that relapse between the lithium group and the control group? Explain your reasoning. (1 pt)

Pages (550 words)
Approximate price: -

Why Work with Us

Top Quality and Well-Researched Papers

We always make sure that writers follow all your instructions precisely. You can choose your academic level: high school, college/university or professional, and we will assign a writer who has a respective degree.

We have a team of professional writers with experience in academic and business writing. Many are native speakers and able to perform any task for which you need help.

Free Unlimited Revisions

If you think we missed something, send your order for a free revision. You have 10 days to submit the order for review after you have received the final document. You can do this yourself after logging into your personal account or by contacting our support.

Prompt Delivery and 100% Money-Back-Guarantee

All papers are always delivered on time. In case we need more time to master your paper, we may contact you regarding the deadline extension. In case you cannot provide us with more time, a 100% refund is guaranteed.

Original & Confidential

We use several writing tools checks to ensure that all documents you receive are free from plagiarism. Our editors carefully review all quotations in the text. We also promise maximum confidentiality in all of our services.

Our support agents are available 24 hours a day 7 days a week and committed to providing you with the best customer experience. Get in touch whenever you need any assistance.

Try it now!

## Calculate the price of your order

Total price:
\$0.00

How it works?

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

Proceed with the payment

Choose the payment system that suits you most.

Our Services

No need to work on your paper at night. Sleep tight, we will cover your back. We offer all kinds of writing services.

## Essay Writing Service

No matter what kind of academic paper you need and how urgent you need it, you are welcome to choose your academic level and the type of your paper at an affordable price. We take care of all your paper needs and give a 24/7 customer care support system.