MA215 Grantham University Week 6 ROI Analysis

Using the ROI data set:

  1. For each of the 2 majors test the hypothesis at the 5% significance level:
    • The mean ‘Cost’ for a college is $160,000. Be sure to interpret your results.
  2. For Business versus Engineering majors conduct a two sample test of the hypothesis at the 10% significance level (assume the variances are not equal):
    • The average ’30-Year ROI’ for Business majors is less than for Engineering Majors. Be sure to interpret your results.File Attached

    File attached

Solve a probability problem

A and B flip coins. A starts and continues flipping until a tail occurs, at which point B starts flipping and continues until there is a tail. Then A takes over, and so on. Let P1 be the probability of the coin landing on heads when A flips and P2 when B flips. The winner of the game is the first one to get:

(1) a total of 2 Heads

(2) a total of 3 Heads.

Plz dont just copy the explanation online which I have seen but could not understand.

Thanks!

What are the fundamental differences between special-cause variation and common-cause variation?

Homework Assignment 2

Answer the following question sin the space provided below:

Explain the importance of variation to health-care organizations?

a) What might be the key processes for health-care organizations?

b) What are the potential common causes of variation that would have an impact on the key processes of health-care organizations?

c) What special causes might be more important than others?

d) How might health-care organizations’ business environment be dynamic and change over time?

i need this done help MATH PROBLEM 4.07 6th grade work

Assignment: Tax and Tip Investigation

How much does it really cost to enjoy a meal at your favorite restaurant?

Find a menu from one of your favorite places to eat (you can find a lot of restaurant menus online).

Make a list of what you would typically order at this restaurant. Be sure to include drinks, appetizers, sides, and desserts if you generally order these things. Next to each item, write the price that is listed on the menu.

Now add the prices of all of these items together to get your subtotal:__________________

What is the sales tax in your area? ___________________

How much is the tax on your meal? (If there is no sales tax in your community, use the tax rate of 8% for this exercise.) ____________

You should leave your server an 18% tip. How much should you tip for this meal? _______

What is the total cost of your meal (with tax and tip)? _________

In a hypothesis test, a Type II error occurs when, Statistics Quiz help

In a hypothesis test, a Type II error occurs when:

  • Correct Answer
  • Correct Answer
  • Correct Answer
  • Correct Answer

Discussion reply

Our text defines a hypothesis as “a claim about a population parameter (population proportion or population mean) or some other characteristic of a population” (Bennett et. al., 2018). According to Bennett et. al. (2018) a hypothesis test refers to a standard method of testing whether a claim can be supported by available evidence. In order to perform a hypothesis test, you must have a null hypothesiswhich is the beginning assumption that claims a specific value for the population parameter being tested and takes the form of equality, and you must also have an alternative hypothesiswhich is a claim that the population parameter being tested is opposite of or differsfrom the null hypothesis value (Bennett et. al., 2018).

As a critical care nurse, I see many patients daily that are on ventilators for airway management and support. “Ventilator-associated pneumonia (VAP) is one of the most commonly encountered hospital-acquired infections in intensive care units and is associated with significant morbidity and high costs of care” (Keyt et. al., 2014). A study that could be done at our facility, or any critical care facility for that matter, could be a hypothetical study of preventative measures for development VAP. For example, our facility could claim providing oral care every 4 hours with chlorhexidine gluconate results in the reduction of VAP development by 20% or more. This would be our null hypothesis. As for the alternative hypothesis, it would state that providing oral care with chlorhexidine gluconate every 4 hours reduces VAP development by less than 20%. In our lesson we learned that the outcome of a hypothesis test neither proves or disproves the claim; it only provides us with the evidence to support or refute the claim.

In 2012, members of the Department of Periodontology conducted a study to evaluate the effectiveness of oral decontamination on VAP prevention. Their study found that out of 61 ventilator dependent ICU patients, 34 developed VAP (55.7%) within 6.8 d. The rate of VAP development was significantly higher in the control group (in which they used saline mouth swabs) than in the chlorhexidine group (68.8% vs. 41.4%, respectively; p = 0.03) with an odds ratio of 3.12 (95% confidence interval = 1.09-8.91). The findings of this study suggest “oral care with chlorhexidine swabbing reduces the risk of VAP development in mechanically ventilated patients, strongly supports its use in ICUs and indeed the importance of adequate oral hygiene in preventing medical complications” (Ozcaka et. al., 2012).

If our facility were to conduct a similar study and the outcomes were such as these, we would not rejectthe null hypothesis because the group’s VAP rates who received oral care with chlorhexidine were decreased by 27.4% when compared to the group that received oral care with saline swabs. This means that the evidence obtained by the study is sufficient in supporting our claim that providing oral care with chlorhexidine gluconate every 4 hours reduces VAP rates by 20% or more.

Many times, we have nurses that think oral care is a waste of time or should be done but isn’t really all that important. If we could put the data for their particular facility in front of them to prove that sometimes it is oral care that makes the difference for patient’s not acquiring VAP, I believe that could change their perspective and encourage compliance with providing the patients with oral care every 4 hours and even as needed between those 4 hours.

References:

Bennett, J., Briggs, W. L., Triola, M.F. (2018). Statistical Reasoning for Everyday Life 5th Edition.Pearson.

Keyt, H., Faverio, P., & Restrepo, M. I. (2014). Prevention of ventilator-associated pneumonia in the intensive care unit: a review of the clinically relevant recent advancements. The Indian journal of medical research, 139(6), 814-21. Retrieved from: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4164993/#ref45 (Links to an external site.)Links to an external site.

Özçaka Ö, B. O. (2012, October). Chlorhexidine decreases the risk of ventilator-associated pneumonia in intensive care unit patients: a randomized clinical trial.Retrieved from PubMed.gov: https://www.ncbi.nlm.nih.gov/pubmed/22376026 (Links to an external site.)Links to an external site.

stats, rad and post answers only

show work in Microsoft word and upload

For the following data:

(a) Use Excel or another software to draw the scatter plot for the variables. You can either upload the file or copy the scatterplot into the text box for your answer.

(b) Visually, determine whether there is a linear correlation between the two variables and, if so, determine whether it is positive or negative.

(c) Using statistical methods, test the significance of the correlation coefficient at an alpha value of 0.05. Compare these results with your results from (b).The director of an alumni association for a small college wants to determine whether there is any type of relationship between the amount of an alumnus’s contribution (in dollars) and the years the alumnus has been out of school. The data follow.

Years x 1 5 3 10 7 6

Contribution y 500 100 300 50 75 80

2. For the following data: (a) Use Excel or another software to draw the scatter plot for the variables. You can either upload the file or copy the scatterplot into the text box for your answer.

(b) Visually, determine whether there is a linear correlation between the two variables and, if so, determine whether it is positive or negative.

(c) Using statistical methods, test the significance of the correlation coefficient at an alpha value of 0.05. Compare these results with your results from (b).

The average normal daily temperature (in degrees Fahrenheit) and the corresponding average monthly precipitation (in inches) for the month of June are shown here for seven randomly selected cities in the United States.

Avg. daily temp. x 86 81 83 89 80 74 64

Avg. mo. precip. y 3.4 1.8 3.5 3.6 3.7 1.5 .2

3. For the following data: (a) Use Excel or another software to draw the scatter plot for the variables. You can either upload the file or copy the scatterplot into the text box for your answer.

(b) Visually, determine whether there is a linear correlation between the two variables and, if so, determine whether it is positive or negative.

(c) Using statistical methods, test the significance of the correlation coefficient at an alpha value of 0.05. Compare these results with your results from (b).

An environmentalist wants to determine the relationships between the numbers (in thousands) of forest fires over the year and the number (in hundred thousands) of acres burned. The data for 8 recent years are shown.

Number of fires x 72 69 58 47 84 62 57 45

Number of acres burned y 62 42 19 26 51 15 30 15

4. Which of the following statements is true about the following conclusion drawn after finding that there is a significant correlation between annual personal income and years of education.

Conclusion: More education causes a person’s income to rise.

A. The conclusion cannot be drawn because correlation does not necessary implies causality.

B.The conclusion is correct since the correlation is significant.

C. The conclusion is incorrect; Instead we should conclude that annual personal income increases more years of education.

D. No answer text provided.

Can you please help me with this

Which of the following best describes the graph of the equations?

4y = 3x + 8 

-6x = ­-8y + 24

A. The lines are parallel

B. The lines have the same x­-intercept

C. The lines are perpendicular

D. The lines have the same y­-intercept

Applying Research in Court Settings, statistics homework help

Psychologists have interacted with the courts much longer than forensic psychology has been recognized as a field. Indeed, the usage of psychological expertise and data by the court and legal systems is quite broad. Attorneys, for example, hire psychologists and forensic psychology professionals as consultants to assist in the selection of a jury suitable to their client’s case. Expert testimony from psychologists and forensic psychology professionals has been proffered on many subjects to help jurors better understand technical and scientific data. Psychological research on how a jury works and how jurors make decisions has shed new light on the legal process. Even family courts rely on psychological data and expert testimony to aid in the awarding of child custody during divorce proceedings. Reading research studies related to court settings will familiarize you with a wide variety of empirical data used in the court system.

To prepare for this Discussion:

  • Identify (Attached) a psychological research study that could be used in a court setting by a forensic psychologist or forensic psychology professional.
  • Review the methods and results sections of this research study and think about how this study might be used by forensic psychologists or forensic psychology professionals working in a court setting.

With these thoughts in mind:

Post a description of the research study you selected. Then, explain the parts of this study that you believe might be important for a forensic psychology professional working in a court setting. Finally, explain how a forensic psychology professional might use the results of the study in a court setting.

500 word minumum, APA format only at least 1 cite.

standardize Data and Compare Scores, algebra homework help

Please check my answers and answer the one I couldn’t.