Mr. Jones wanted to check if there was an observable impact of a particular worksheet on his students’ test scores for Chapter 1. His idea was to test if there was a significant variation in the average test score of the class that used the worksheet in comparison to the class that did not. In the class before lunch, he used the worksheet but not the one after lunch. He has 23 students in each class. Their test scores are below:

1. Which test are you using?
2. What are your H0 (null hypothesis) and Ha (alternative hypothesis)?
3. Calculate your statistic.
4. What decision does this inform you to make and why? (You may use the critical value in the chart or the calculated p-value, but you must indicate what you are doing.)
5. Write a one to two sentence conclusion that correctly responds to the question.

Buffers

Q1:

a.  Write the balanced chemical equation for the reaction of HCN with water. HCN + H₂ O----> CN^- + H₃O Do not answer this

b. What is the pH and concentration of CN^– in a 0.100M solution of HCN? [CN^-]=7.87 x 10^-6Do not answer this

c. What would happen if the equilibrium [CN^–] that you calculated in (b) was changed by adding 0.00500 moles of solid NaCN to 100.0 mL of the solution? (Which direction is the reaction going to “go” to minimize the disturbance?) pH: 5.10 Do not answer this

d. Determine the pH of the solution in (c) . Assume that the addition of solid NaCN does not change the volume of solution. pH:8.91 Do not answer this

e. What is the name of this type of solution?

f. Determine the pH of the solution from (c) AFTER 10.0 mL of 0.100M HNO₃ is added.

g. Determine the pH of the solution from (c) AFTER 10.0 mL of 0.100M KOH is added.

h. How many moles of strong acid could you reasonably expect to add to the solution in (c) before the pH would change drastically?

i. How many moles of strong base could you reasonably expect to add to the solution in (c) before the pH would change drastically?

1.     What contaminants may remain behind after physical & chemical methods used to purify water, and how can these be removed?

2. Describe two variables that may not be controlled for that limit the accuracy of assessing the effectiveness of physical and chemical treatment methods:

3. Why would 0.01 ml (10µl) of untreated pond water be used when creating an agar plate sample, but 10 ml of treated water be used when creating an agar plate sample?

4. Why would sample testing be done in triplicate?

Question number three is comparing the samples taken just from the pond water without treatment and the samples that were filtered or chemicaly treated. The small amount of sample is the one just taken from the pond and the larger amount of liquid is from the samples that were treated. I am curious why the samples just taken from the pond were so small compared to the treated samples. Also the smaller samples straight from the pond were multiplied by a dilution factor before being compared to the larger treated samples. This lab had to do with counting bacteria growths on an agar plate before and after filtration.

Which of the following statements is (are) correct?
(x) If the demand curve is perfectly inelastic, then buyers bear the entire burden of the tax and the price kept by the seller after the tax is imposed is the same amount as they kept before the tax was imposed
(y) If the supply curve is perfectly inelastic, then sellers bear the entire burden of the tax and the price paid by buyers is the same after the tax is imposed as the amount buyers paid before the tax was imposed
(z) If the demand curve is perfectly inelastic, then government will not be able to collect any tax revenue since buyers bear the entire burden of the tax.
A. (x), (y) and (z)
B. (x) and (y) only
C. (x) and (z) only
D. (y) and (z) only
E. (y) only

The demand for salt is price inelastic and the supply of salt is price elastic. The demand for caviar is price elastic and the supply of caviar is price inelastic. Suppose that a tax of $1 per pound is levied on the sellers of salt and a tax of $1 per pound is levied on the buyers of caviar. We would expect that most of these taxes will be paid by the _________ of salt and the ________ of caviar.
A. sellers: buyers
B. sellers; sellers
C. buyers; sellers
D. buyers; buyers
E. B or D, only

Buffers
Q1:
a. Write the balanced chemical equation for the reaction of HCN with water.

answer: HCN + H2 O----> CN- + H3O
b. What is the pH and concentration of CN– in a 0.100M solution of HCN?

answer: [CN-]=7.87 x 10-6     pH: 5.1

c. What would happen if the equilibrium [CN–] that you calculated in (b) was changed by adding 0.00500 moles of solid NaCN to 100.0 mL of the solution? (Which direction is the reaction going to “go” to minimize the disturbance?)

answer: Backward direction

d. Determine the pH of the solution in (c) . Assume that the addition of solid NaCN does not change the volume of solution.

answer :pH:8.91

e. What is the name of this type of solution?

answer: Buffers

f. Determine the pH of the solution from (c) AFTER 10.0 mL of 0.100M HNO3 is added.
g. Determine the pH of the solution from (c) AFTER 10.0 mL of 0.100M KOH is added.
h. How many moles of strong acid could you reasonably expect to add to the solution in (c) before the pH would change drastically?
i. How many moles of strong base could you reasonably expect to add to the solution in (c) before the pH would change drastically?

For the Question below, refer to the following fact scenario for Papa Johns Corp. at December 31, 2016:

Net Credit Sales: $3,250,000

Accounts Receivable: $400,000

Allowance for Doubtful Accounts (Before any adjustment at year-end): $2300 debit

1) Assume that the accounts for Papa Johns performed an aging of Accounts Receivable and determined the following:

AGE Amount % Estimated Uncollectible

Not yet due $320000 5%

0-60 days past due $50000 40%

>60 days past due $30000 60%

The entry to adjust for estimated bad debts at December 31, 2019 would be:

a)After the entry above, what is the amount of net realizable receivables?

b)After the entry in a) above, what is the amount showing on the Income Statement as Bad Debt Expense?

c) On January 10, 202, Papa Johns Corp, determined that one receivable, in the amount of $2200, was not going to be collectible. The entry to write off this receivable is as follows:

d) If the balance in the account Allowance for Doubtful Accounts was a $1800 credit, before any adjustment (rather than a $2300 debit), the entry to adjust for estimated bad debts at December 31, 2019 would be:

e) The account Allowance for Doubtful Accounts typically has a ____________ (debit or credit) balance

Case Study—The Client With a Bacterial Infection

Gloria Lawton, a 42-year-old secretary, has come to the clinic complaining of a fever, sore throat, and cough, which she has had for the past 24 hours. Her posterior pharynx is reddened, with patches of purulent exudate. She complains of pain with swallowing. Her cervical lymph nodes are enlarged and tender to touch. Based on the client's symptom history and physical examination, the physician suspects a streptococcal infection. After a sample for a throat culture is taken, Ms. Lawson is started on amoxicillin, 500 mg PO every 8 hours for 10 days.

1. Explain the rationale for getting a sample for a throat culture before the first dose of amoxicillin is administered.

2. Before administering the first dose of amoxicillin, what additional assessment data does the nurse need to collect from the client?

3. What should the nurse teach Ms. Lawton about taking the amoxicillin?

4. After the completion of the 10 days of drug therapy, Ms. Lawton's upper respiratory symptoms have resolved. However, she is now complaining of intense perineal itching and a vaginal discharge. How should the nurse respond to Ms. Lawton's questions about these symptoms?

1-

Assuming potato chip bag fill weights are normally distributed, consider a new random sample of n=5 fill weights. Do NOT use any prior mean and standard deviation assumptions. The new study fill weight data values are:

7.5 8.1 9.2 7.8 8.4

Test the null hypothesis that the population mean is 7.5 vs. the alternative that the population mean is GREATER than 7.5 oz. Use the 0.05 significance level.

Enter the P-VALUE.

Note: Enter X.XX AT LEAST ONE DIGIT BEFORE THE DECIMAL, TWO AFTER and round up. Thus, 27 is entered as 27.00, 3.5 is entered as 3.50, 0.3750 is entered as 0.38

2-

Enter the Critical Value from the appropriate book table for the above test of hypothesis. Use a 0.05 significance level.

Note: Enter X.XX AT LEAST ONE DIGIT BEFORE THE DECIMAL, TWO AFTER and round up. Thus, 27 is entered as 27.00, 3.5 is entered as 3.50, 0.3750 is entered as 0.38

3-

What is the conclusion of the above test? Use a 0.05 significance level. Enter 3 CAPITAL LETTERS:

REJ - Reject H0 in favor of H1

FTR - Fail to Reject H0

The market demand for gasoline can be represented by the equation Q=120-2P, where quantity Q is measured in gallons/week and price P is measured in dollars per gallon. The supply curve for gasoline, however, depends on whether the time frame is the short run or the long run. A per-gallon tax of $6 is imposed on the gasoline market.

a. In the short run, the supply function for gasoline is represented by

80 if P>5

Q = anything between 0 and 80, inclusive, if P = 5

0, if p<5

Please calculate the equilibrium prices and quantity of gasoline in the short run, both before and after the introduction of the tax. Calculate the deadweight loss of the tax. Please provide a graph to illustrate your answer.

b. In the long run, the supply curve for gasoline is horizontal at P=20. Please calculate the equilibrium prices and quantity of gasoline in the long run, both before and after the introduction of the tax. Calculate the deadweight loss of the tax. Please provide a graph to illustrate your answer.

Do buyers or sellers tend to bear more of the burden of the tax? Does your answer depend on whether the market is looked at in the short run or the long run? Why or why not?

Thank you!

As the chief financial officer of ADM Designs, you are considering to raise $50 million in new debt financing. You are provided with the following information:

Next year’s expected net income after tax but before new financing: $49 million

Sinking-fund payments due next year on the existing debt $15 million

Interest due next year on the existing debt $10 million

Interest rate on new debt 5%

Common stock price, per share $25.00

Common shares outstanding 10 million

Company tax rate 30%

Assume that the annual sinking-fund payments on the new debt will equal $5 million next year. Calculate ADM's % EBIT can fall before the firm struggles to service its interest and principal payments. Show your work by providing the answers for the following ratios:

EBIT = ?

TBC= EBIT / (IE + PP/(1-t)) = ? %

EBIT can fall = ?

Calculate next year’s earnings per share assuming ADM raises $50 million in new debt financing. Show your work by providing the answers to the following questions:

Net income after new financing = ?

EPS = Net income / No. of shares outstanding = ?