For each of these questions, your audience are persons that are not experts in statistics. Write with complete sentences and paragraphs. Cite any references that you use.
(5 pts.) When building a model, you make four assumptions about the residuals. Explain what they are and how you can verify that your assumptions are correct.
(5 pts) Define ‘interaction term’. From your own experience, identify an instance in which you believe an interaction term would be appropriate.
In: Statistics and Probability
1. A blood smear is used to diagnose malaria. In patients with malaria, the protozoa can be found near and inside red blood cells. Explain why a microscope capable of high magnification and high resolution would be needed to diagnose malaria.
| Structures inside a cell including protozoa are very small and cannot be seen with low magnification. |
| Malaria symptoms are non-specific and microscopy is the only way to discriminate between several diseases. |
| A microscope is needed to count the red blood cells present in a sample. |
| A compound microscope with high magnification and high resolution is used to get a clear, three-dimensional view of the protozoa and the shape of the red blood cells. |
2. Histopathology is the use of microscopes to view tissues to diagnose and track the progression of diseases. Why are thin slices of tissue ideal for this procedure?
| Thin slices are used so that pathologists can clearly see individual cells for their assessment. Too many layers of cells makes it difficult to focus and hard to see what changes have occurred in the tissues. |
| Thick sections would waste a lot of material and would require larger patient samples. |
| Thin slices are easier to prepare. |
| Thin slices are used because thicker tissue slices are more difficult to stain, and it is harder to see cellular details. |
In: Anatomy and Physiology
In: Chemistry
Name and detail the mechanism(s) through which this DNA damage can occur. What mechanism(s) have cells developed to deal with this damage when it is encountered? Detail how this led to the elucidation of DNA repair enzymes in your answer.
In: Biology
In: Biology
What contemporary global issue topic to tackle in making a position paper?
Kindly give the following reasons and additional information about why it is essential.
I will use your advice in making a position paper that requires 2000 words
You can put it in bullet form at least 8 bullets. explain it as clear as you can.
Automatic like if satisfied.
In: Economics
Suppose that students own an average of 4 pairs of jeans. 8 people from your class were surveyed to determine if the average for students is higher than 4.
DATA TO USE: 2, 2, 3, 4, 6, 6, 8, 9
a. Give the null and alternative hypotheses: Ho: _______________ Ha: ___________________
b. In words, CLEARLY state what your random variable or P' represents.
c. State the distribution to use for the test. If t, include the degrees of freedom. If normal, include the mean and standard deviation.
d. p-value = ______________
e. In 1 – 2 complete sentences, explain what the p-value means for this problem.
f. Use the previous information to draw a graph of this situation. CLEARLY, label and scale the horizontal axis and shade the region(s) corresponding to the p-value. The values of your sample statistic and the hypothesized value of the population parameter should be on the axis.
g. Indicate the correct decision (“reject the null hypothesis” or “do not reject the null hypothesis”) and write an appropriate conclusion, using COMPLETE SENTENCES.
Decision:
Conclusion:
h. Construct a 95% Confidence Interval for the true mean or proportion. Include a sketch of the graph of the situation. Label the point estimate and the lower and upper bounds of the Confidence Interval.
Confidence Interval: ( ___________________ , ___________________ )
i. Interpret the confidence interval in a complete sentence.
In: Statistics and Probability
1. What is the difference between accounting and bookkeeping?
Part 1 -Balance Statement
2. What is the basic accounting equation? What is the purpose of a balance sheet (what does it show a business person; how is it used)?
3. Why is it that the assets always equals the total of liabilities and owner's equity? Explain this in your own words
. 4. Use an example of a person who is buying a house to illustrate why assets always equals owner's equity plus liabilities.
Part 2 - Income Statement
5. Explain what an income statement is and how it is used by a business person. Is this something prepared once a year, every month, every week? Explain.
6. What is a Statement of Cash Flows?
Part 3 - Using Ratios It’s important to use ratios to understand a business's financial health. Examples include liquidity ratios, leverage ratios, profitability ratios and activity ratios
. 7. Which of the four types of ratios do you believe is the most insightful to really understanding the financial health of a business? Explain why you believe the ratio you picked is more useful than the other ratios discussed. For example, if you state you believe leverage (debt) ratios are most important to really seeing how financially healthy a business is, why are these ratios more important than the liquidity, profitability, or activity ratios?
Explain your answer. Explain your reasoning. To support your answer, find a source online that provides additional information to help you answer this question. Properly cite to the source. Remember, pasting in a URL is not a proper citation for a source.
In: Accounting
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David Anderson has been working as a lecturer at Michigan State University for the last three years. He teaches two large sections of introductory accounting every semester. While he uses the same lecture notes in both sections, his students in the first section outperform those in the second section. He believes that students in the first section not only tend to get higher scores, they also tend to have lower variability in scores. David decides to carry out a formal test to validate his hunch regarding the difference in average scores. In a random sample of 21 students in the first section, he computes a mean and a standard deviation of 88.9 and 20.7, respectively. In the second section, a random sample of 19 students results in a mean of 85.2 and a standard deviation of 1.02. |
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Sample 1 consists of students in the first section and Sample 2 represents students in the second section. |
| a. |
Construct the null and the alternative hypotheses to test David’s hunch. |
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| b-1. |
Calculate the value of the test statistic. (Round intermediate calculations to 4 decimal places and final answer to 2 decimal places.) |
| Test statistic |
| b-2. | What is assumption regarding the population variances used to conduct the test? | ||||||
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| c. | Implement the test at ? = 0.10 using the critical value approach. | ||||||||
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In: Statistics and Probability
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David Anderson has been working as a lecturer at Michigan State University for the last three years. He teaches two large sections of introductory accounting every semester. While he uses the same lecture notes in both sections, his students in the first section outperform those in the second section. He believes that students in the first section not only tend to get higher scores, they also tend to have lower variability in scores. David decides to carry out a formal test to validate his hunch regarding the difference in average scores. In a random sample of 16 students in the first section, he computes a mean and a standard deviation of 75.9 and 21.5, respectively. In the second section, a random sample of 20 students results in a mean of 74.2 and a standard deviation of 1.03. |
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Sample 1 consists of students in the first section and Sample 2 represents students in the second section. |
| a. |
Construct the null and the alternative hypotheses to test David’s hunch. |
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|
| b-1. |
Calculate the value of the test statistic. (Round intermediate calculations to 4 decimal places and final answer to 2 decimal places.) |
| Test statistic |
| b-2. | What assumption regarding the population variances is used to conduct the test? | ||||||
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| c. | Implement the test at ? = 0.01 using the critical value approach. | ||||||||
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In: Statistics and Probability