using a buret, add 1, 5, 10, and 15mL of standardized 0.0024 M K2CrO4 to each of four clean, dry 100-mL volumetric flasks and dilute to the 100 mL mark with 0.25 M NaNO3. Calculate the CrO4 2- concentration in each of these flasks
In: Chemistry
|
Researchers at the Mayo Clinic have studied the effect of sound levels on patient healing and have found a significant association (louder hospital ambient sound level is associated with slower postsurgical healing). Based on the Mayo Clinic's experience, Ardmore Hospital installed a new vinyl flooring that is supposed to reduce the mean sound level (decibels) in the hospital corridors. The sound level is measured at five randomly selected times in the main corridor. |
| New Flooring | Old Flooring |
| 39 | 47 |
| 44 | 50 |
| 40 | 51 |
| 40 | 53 |
| 45 | 48 |
| (a-1) |
Does the evidence convince you that the mean sound level has been reduced? Select the appropriate hypotheses. |
| a. | H0: μ1 – μ2 ≥ 0 vs. H1: μ1 – μ2 < 0 |
| b. | H0: μ1 – μ2 = 0 vs. H1: μ1 – μ2 ≠ 0 |
| c. | H0: μ1 – μ2 ≤ 0 vs. H1: μ1 – μ2 > 0 |
|
| (a-2) | At α = 0.05, what is the decision rule? Assume equal variances. |
| a. | Reject the null hypothesis if tcalc > –1.86 (8 d.f.) |
| b. | Reject the null hypothesis if tcalc < –1.86 (8 d.f.) |
|
|
(a-3) |
Calculate the test statistic. (Round your answer to 4 decimal places. Input the answer as a positive value.) |
| Test statistic |
| (a-4) | At α = .05, is the mean sound level reduced? |
| (Click to select) Reject / Do not reject H0, the mean (Click to select) has been / has not been reduced.? |
| (b-1) |
At α = .05, has the variance changed? Choose the correct hypothesis. |
| a. | H0: σ12 / σ22 = 1vs. H1: σ12 / σ22 ≠ 1. |
| b. | H0: σ12 / σ22 ≠ 1vs. H1: σ12 / σ22 = 1. |
|
| (b-2) | At α = .05, what is the decision rule? |
| a. | Reject H0 if Fcalc < 9.60 or Fcalc > .1042. (d.f.1 = 4, d.f.2 = 4.) |
| b. | Reject H0 if Fcalc > 9.60 or Fcalc < .1042. (d.f.1 = 4, d.f.2 = 4.) |
|
|
(b-3) |
What is the test statistic? (Round the test statistic value to 4 decimal places.) |
| Test statistic |
| (b-4) | At α = .05, has the variance changed? |
| (Click to select) Reject / Do not reject H0, the variance (Click to select) has / has not been changed.? |
In: Math
A racecar of mass 500 kg is going around a curve of radius 15.0 m, banked at 45∘ . The car has a coefficient of static friction with the track which is 0.200. The car also has a rear wing which produces downforce—“negative lift” due to airflow over the wing, which pushes the car into the track. The downforce is given by ? = ?v2 , where ? = 10 kg/m. Find the minimum and maximum speeds between which the car can take the curve without skidding.
In: Physics
Answer the following questions on price elasticity of demand.
|
a. |
The price elasticity of demand for MLB tickets is –1.00. What happens to the quantity of tickets sold if ticket prices rise by 5%? |
|
b. |
The price elasticity of demand for fried chicken is –0.12. What happens to expenditures on fried chicken following a price increase? |
|
c. |
Suppose the demand for insulin is given by QD = 500. What is the price elasticity of demand at P = $100? |
|
d. |
What will happen to the price elasticity of demand if there are less substitute goods available? |
In: Economics
Describe with
example learning organisations processes
which know Single-Loop and
Double-Loop?
Single-Loop:
Double-Loop:
In: Operations Management
explain in the Fortran 77 code performance evaluation of evaporative cooler with corrugated fins and spherical fins...
mention it's parameter in Fortran 77 and plot graph using fortran 77
skip it.....if u can't answer it.....
In: Mechanical Engineering
The following table provides two risky assets for you to construct the investment opportunity sets based on the given correlation information.
Constructing investment opportunity sets
Complete the table of Risks and Returns of all the possible combinations.
For each correlation situation, insert a “Mean-Standard Deviation” chart and plotting the investment opportunity sets with varying weights on the two risky assets, then connecting the dots to show the curvature of each investment set.
Given a risk-free of 3%, draw a capital allocation line (CAL) to connect the risk-free rate and the “optimal portfolio” point on each curvature chart.
Please complete on excel and show work
|
Assets |
Expected return |
Risk (STD) |
|
A |
10% |
25% |
|
B |
6% |
12% |
|
Risk-free |
3% |
0% |
| Correlation | Coeffiecient | between | asset A | and B | ||
| -1 | -0.5 | 0 | 0.5 | 1 | ||
| Weight in Asset A | Return of the portfolio (Rp) | STD(P) | STD (P) | STD (P) | STD (P) | STD (P) |
| 0% | ||||||
| 10% | ||||||
| 20% | ||||||
| 30% | ||||||
| 40% | ||||||
| 50% | ||||||
| 60% | ||||||
| 70% | ||||||
| 80% | ||||||
| 90% | ||||||
| 100% |
In: Math
Visualize the initially empty myHeap after the following
sequence of operations
o myHeap.add(2)
o myHeap.add(3)
o myHeap.add(4)
o myHeap.add(1)
o myHeap.add(9)
o myHeap.remove()
o myHeap.add(7)
o myHeap.add(6)
o myHeap.remove()
o myHeap.add(5)
In: Computer Science
do you think economists should alter the way they model firm behavior? In other words, do you think it’s accurate to model firm’s behavior with the assumption that firm’s primary objective is to maximize profit? Explain your answer
In: Economics
On behalf of the company, draft a formal letter to the customers who are rated “Poor” (be creative). Use another worksheet for this. Please follow the rubrics
In: Operations Management
Business Law
Case Scenario:
Ashley met Adam at a party and after a couple of drinks; Ashley found out that Adam is in the business of selling education products.
Compare and contrast the different liabilities for Ashley and Adam in each of the following different situations, where Ashley is buying, and Adam is selling and they are about to or have entered into a contract.
Q# a. Both parties discussed their intentions and Ashley stated what kind of education products she was interested in. However, they parted ways after that. Ashley said later that there was no contract between them but Adam stated that Ashley has already reserved the products she wanted with him.
(Please recommend any books for further more study), Thank You.
In: Economics
Define Porter's competitive forces model and explain how it works. Include a description of the five competitive forces in this discussion, giving examples.
In: Operations Management
MUST ANSWER EVERY PART
In each of the following situations, Emma is in the exact center of a glass-sided fright car speeding to the right at a very high speed v relative to you. For each question, explain your reasoning.
Emma has a flashlight in each hand and directs them at the front and rear ends of the freight car. She then switches the flashlights on at the same time.
In Emma�s frame of reference, which beam of light travels at a greater speed, the one directed toward the front or the one directed toward the rear of the train, or do they travel at the same speed?
In Emma�s frame of reference, which end, front or rear, is struck by light first, or are they struck at the same time? Which end is struck first in your frame of reference?
In: Physics
An educational researcher wishes to know if there is a difference in academic performance for college freshmen that live on campus and those that commute. Data was collected from 267 students. Can we conclude that freshman housing location and academic performance are related? Location Average Below Average Above Average Total On campus 89 29 27 145 Off campus 36 43 43 122 Total 125 72 70 267 Copy Data Step 2 of 8 : Find the expected value for the number of students that live on campus and have academic performance that is average. Round your answer to one decimal place.
In: Math
Regulation of the lac operon is under both negative and positive control. Describe how these two transcriptional control mechanisms regulate expression of the lac operon in the presence of glucose and/or lactose.
In: Biology