What percentage of total ammonia (NH3 + NH4+) is present as ammonia (NH3) at pH of 7 and pH of 9 if pKa for NH4+ is 9.3. Based on your answer, explain whether low pH is more favorable or high pH for aquatic organisms.

2. Based on the data below:

a) Plot the percentage of insects versus the natural logarithm of the dose.

b) Convert the data to probit variable, and plot the probit versus the natural logarithm of the dose.

c) Determine the probit constants and the LC50. Please show all calculations.

2. Based on the data below:

a) Plot the percentage of insects versus the natural logarithm of the dose.

b) Convert the data to probit variable, and plot the probit versus the natural logarithm of the dose.

c) Determine the probit constants and the LC50. Please show all calculations.

21.

When consumers respond to a price change but the percentage change in quantity demanded (in absolute value) is smaller than the percentage change in price (in absolute value), the demand is described as being _______.

Group of answer choices

perfectly inelastic

perfectly elastic

inelastic

unit elastic

elastic

22.

Assume that you manage a car wash, and you have previously calculated the price elasticity of demand to be 1.2 (in absolute value). To draw in more customers, you decide to decrease your price by 5%. Based on this information, you would estimate the quantity demanded will _______ by _______.

Group of answer choices

decrease, 4.17%

increase, 5%

increase, 6%

increase, 4.17%

decrease, 6%

23.

The difference between how much a consumer is willing to pay for the total amount of a good or service consumed and the amount actually paid is called total utility.

Group of answer choices

True

False

24.

Which of the following is true regarding the production possibility frontier model? There is more than one correct answer to this question. You must mark all of the correct answers to receive full credit for this question.

Group of answer choices

The PPF always slopes down because resources are limited.

Resource use is efficient in producing all of the combinations shown on a PPF.

Using only the PPF model, it is not possible to state that any one combination on a frontier is superior to any other combination on the same frontier.

If resources are not specialized, the PPF will be a straight, downward-sloping line.

The principle of increasing marginal opportunity cost only applies in cases when resources are specialized.

25.

Assume there is a decrease in the price of a complement, an increase in income, a decrease in the number of firms, an increase in the cost of an input, firms expect a higher price, and consumers expect a lower price. Based on all of this information, which of the following is correct?

Group of answer choices

The equilibrium price will decrease, and the equilibrium quantity will decrease.

The equilibrium price will increase, and the equilibrium quantity will decrease.

The equilibrium price will increase, and the equilibrium quantity will increase.

More information is needed to know what changes will occur in the equilibrium price/quantity.

The equilibrium price will decrease, and the equilibrium quantity will increase.

26.

Above the equilibrium price, there is a _______ and an automatic pressure for the price to _______.

Group of answer choices

shortage, increase

shortage, decrease

surplus, increase

surplus, decrease.

27.

A recent news broadcast made the following statement: “An increase in the price of coffee has caused a decrease in the demand for coffee.” Would an economist agree with this statement? (Carefully look at the wording.)

Group of answer choices

No, an economist would not agree with this statement.

Yes, an economist would agree with this statement.

28.

In which of the following cases will a firm’s total revenue decrease? There is more than one correct answer to this question. You must mark all of the correct answers to receive full credit for this question.

Group of answer choices

price increases and demand is inelastic

price decreases and demand is inelastic

price decreases and demand is elastic

price increases and demand is perfectly inelastic

price increases and demand is elastic

29.

A life-saving medication that has no substitutes is likely to have a price elasticity of demand that is less than one in absolute value.

Group of answer choices

True

False

30.

In a graph of a production possibility frontier, price is indicated on the vertical axis and quantity is shown on the horizontal axis.

Group of answer choices

True

False

The home run percentage is the number of home runs per 100 times at bat. A random sample of 43 professional baseball players gave the following data for home run percentages. 1.6 2.4 1.2 6.6 2.3 0.0 1.8 2.5 6.5 1.8 2.7 2.0 1.9 1.3 2.7 1.7 1.3 2.1 2.8 1.4 3.8 2.1 3.4 1.3 1.5 2.9 2.6 0.0 4.1 2.9 1.9 2.4 0.0 1.8 3.1 3.8 3.2 1.6 4.2 0.0 1.2 1.8 2.4 (a) Use a calculator with mean and standard deviation keys to find x and s. (Round your answers to two decimal places.) x = % s = % (b) Compute a 90% confidence interval for the population mean μ of home run percentages for all professional baseball players. Hint: If you use the Student's t distribution table, be sure to use the closest d.f. that is smaller. (Round your answers to two decimal places.) lower limit % upper limit % (c) Compute a 99% confidence interval for the population mean μ of home run percentages for all professional baseball players. (Round your answers to two decimal places.) lower limit % upper limit % (d) The home run percentages for three professional players are below. Player A, 2.5 Player B, 2.0 Player C, 3.8 Examine your confidence intervals and describe how the home run percentages for these players compare to the population average. We can say Player A falls close to the average, Player B is above average, and Player C is below average. We can say Player A falls close to the average, Player B is below average, and Player C is above average. We can say Player A and Player B fall close to the average, while Player C is above average. We can say Player A and Player B fall close to the average, while Player C is below average. (e) In previous problems, we assumed the x distribution was normal or approximately normal. Do we need to make such an assumption in this problem? Why or why not? Hint: Use the central limit theorem. Yes. According to the central limit theorem, when n ≥ 30, the x distribution is approximately normal. Yes. According to the central limit theorem, when n ≤ 30, the x distribution is approximately normal. No. According to the central limit theorem, when n ≥ 30, the x distribution is approximately normal. No. According to the central limit theorem, when n ≤ 30, the x distribution is approximately normal.

Drug concentrations​ (measured as a​ percentage) for 25 randomly selected tablets are shown in the accompanying table. For comparisons against a standard​ method, the scientists desire an estimate of the variability in drug concentrations. Obtain the estimate for the population variance for the scientists using a 95​% confidence interval. Interpret the interval.

91.06
92.09
89.98
91.67
82.88
94.09
89.73
89.34
84.27
87.34
89.14
91.67
84.31
89.95
92.28
92.14
84.72
90.02
92.23
89.95
89.17
89.24
92.87
88.57
89.55

The percentage deprotonation of a 0.110 M solution of benzoic acid (a weak, monoprotic acid) is 2.4%. What is the pH of the solution?

A particular school district is concerned about the percentage of high schoolers who vape. In a random sample of 1478 high schoolers taken last year, 61 of them indicated on the anonymous survey that they vape. This year, the survey was given again and out of 1482 high schoolers, 181 of them indicated on the survey that they vape. Is there evidence that the vaping rate is now higher?

a) Test at the 5% level

b) Compute a 90% confidence interval for the difference in proportions.

Let x be a random variable that represents the percentage of successful free throws a professional basketball player makes in a season. Let y be a random variable that represents the percentage of successful field goals a professional basketball player makes in a season. A random sample of n = 6 professional basketball players gave the following information.

​

Verify that S_e ≈ 3.694, a ≈ 38.254, b ≈ 0.153, and , ∑x =447, ∑y =298, ∑x² =33,419, and ∑y² =14,858, and use a 5% level of significance to find the P-value for the test that claims that β is greater than zero.

Group of answer choices

Since the P-value is less than α = 0.05, we reject the null hypothesis that the population slope β is equal to zero in favor of the alternate hypothesis that the population slope βis greater than zero.

Since the P-value is greater than α = 0.05, we reject the null hypothesis that the population slope β is equal to zero in favor of the alternate hypothesis that the population slope βis greater than zero.

Since the P-value is greater than α = 0.05, we fail to reject the null hypothesis that the population slope β is equal to zero in favor of the alternate hypothesis that the population slope β is greater than zero.

Since the P-value is equal to α = 0.05, we reject the null hypothesis that the population slope β is equal to zero in favor of the alternate hypothesis that the population slope βis greater than zero.

Since the P-value is equal to α = 0.05, we fail to reject the null hypothesis that the population slope β is equal to zero in favor of the alternate hypothesis that the population slope βis greater than zero.

Trichloroacetic acid dissociates partially in water according to the equilibrium below. What is the percentage of molecules dissociated in a 1.00 molal solution of trichloroacetic acid in water if the measured freezing point is -2.53C? The freezing point and Kf for water are 0.00C and 1.86 C-kg/mol, respectively.

CCl3CO2H(aq) -> <- (Equalibrium arrows) CCl3CO2 1- (aq) + H+ (aq)

How do I set up and Solve