Experiment 2: Hematocrit In the second experiment, you will determine hematocrit for all students in the class to answer the research question: Is there a difference in hematocrit between male and female college students?
a. What basic type of study design will you use to answer the research question?
a) descriptive b) experimental c) neither
b. More specifically, what type of study design will you use to answer the research question?
a) case study b) cross-over c) cross-sectional d) longitudinal e) pre/post f) randomized, controlled g) retrospective h) time series
c. What type of statistical test would be most appropriate to analyze these data?
a) Chi-square test b) dependent t-test c) independent t-test d) one-way ANOVA e) repeated measures ANOVA f) None of these is appropriate. g) You cannot run statistics on these data.
d. What is(are) the control(s)? Choose ANY that apply.
a) altitude of testing site b) hydration status of subjects c) sex of subjects d) training status of subjects e) There is none.
In: Statistics and Probability
diffusion experiment: my experiment was to cut an agar cube into 64 pieces and place it into different volumes of water. we placed it into 200 mL ( slope of 24) , 600 mL (slope of 12) , and 800 mL (slope of 8). The slope is from the graph, its rate of diffusion graph from each volume.
a. which had the largest affect on the rate of diffusion?
b) Based on your experiments, discuss at least two adaptations that affect diffusion in living organisms (physiological, structural, or behavioral features that evolved due to a selective advantage that was based on diffusion) . Do these match with the factors you identified in a?
In: Biology
Dumas Method Experiment:
In this experiment, we measured a flask with an aluminum foil and elastic band set up then added 4mL of methanol inside the flask and sealed with the foil covering and boiled in a water bath until all the liquid vaporized (this will drive out any air in the flask and push out all excess vapour). Then we cooled it to let the vapour condense and reweighed the flask with the vapour in it. The following questions pertain to the experiment:
For each of the following experimental conditions determine whether the calculated value for molar mass would be: A) too high B) Too low C) Unaffected. In each case, explain how this result occurs.
a) After removing he flask from the water bath, the experimenter cools the flask to room temperature but does not dry it. The calculated molar mass will be: A) too high B) Too low C) Unaffected. Explain.
b) The flask is removed from the water bath containing vapour only, the experimenter cools the flask to room temperature and some vapour condenses inside the flask. The calculated molar mass will be: A) too high B) Too low C) Unaffected. Explain.
c) The flask volume is not measured; instead the experimenter assumes the flask volume to be exactly 125.0 mL. The calculated molar mass will be: A) too high B) Too low C) Unaffected. Explain.
d) From the time the mass of the unused flask assembly (flask, foil and elastic band) is recorded the flask is handled several times with oily fingers. The calculated molar mass will be A) too high B) Too low C) Unaffected. Explain.
In: Chemistry
search the internet for the Stanford Experiment and see the different perspective about this experiment afer viewing the video, if you have been a guard, do you think you would have been more likely to go along with the other guards or would you have resisted or spoken up about treating the prisoners the way you would have wanted to be treated if the roles had been reversed??
In: Psychology
3.This experiment explores the concept of osmosis, with a hands on experiment using potatoes and salt water in your kitchen at home. Be sure to read the instructions for the potato experiment
Actions
in the lab handout ahead of time so you can get the materials you need for the lab before you do it!
In your prelab, you explored diffusion through a semipermeable membrane. In that activity, small particles could easily pass through the semipermeable dialysis membrane. But all semipermeable membranes are not equal! Before starting this lab, consider the following.
A living membrane is considered to be semipermeable. Is it permeable to the same substances as the dialysis membrane used in prelab? Which of the following substances do you expect to passively move through the plasma membrane of potato cells? Pick all that apply.
Group of answer choices
sodium ions
chloride ions
water
4.The passive movement of solutes across a living membrane is called .
The passive movement of water across a living membrane is called .
In: Biology
PH experiment:
What is one real-world or practical application for this experiment or portion of this experiment?
Define the following: abscissa, acid, base, endpoint, equivalence point, neutralization, pH, pKa, mono- protic acid, polyprotic acid, ordinate, strong acid, strong base, and weak acid.
Draw the structure of each of the acids in Table 1.
Produce data tables for each of your runs. Leave room in your notebook for lots of data. Record the actual volume of titrant and solution pH as you conduct the experiment.
Identify all potentially hazardous steps in your procedure. In your own words, explain what safety precautions should be taken and why.
Consider the titration of 0.050 M HCl with 0.050 M NaOH. Calculate the pH: (a) of the pure HCl solution; (b) of 25.00 mL acid plus 12.50 mL base; (c) at the equivalence point; and (d) of 25.00 mL acid and 37.50 mL base.
Consider the titration of 0.050 M NaOH with 0.050 M HCl. Calculate the pH: (a) of the pure NaOH solution; (b) of 25.00 mL base plus 12.50 mL acid; (c) at the equivalence point; and (d) of 25.00 mL base and 37.50 mL acid.
In one experiment, an unknown acid was titrated with NaOH. The pH at the equivalence point was 7.75. Was the unknown acid strong or weak? Explain. Hint: The pH of pure water at room temperature is 7.
In: Chemistry
Name: .
A manager of a local clothing retail store wants to make a sales and promotion plan for next month. In order to evaluate the effectiveness of the plan, the manager identifies all the costs and other relevant information and conducts Break-even analysis. Here are the identified costs and other related information.
Monthly rent fees: $2,500
Wages for the hired employees (Monthly): $6,000
Utility fees (Monthly): $700
Other operation costs (Monthly): $1,000
Purchase price per unit: $78 (The manager purchases clothing from other retailers)
Shipping and handling cost per unit: $12
(Assume there is no other cost)
Answer 9000 :
What is the Variable cost per unit?
Answer 90 :
The manager wants to have 20% profit margin on selling price. What is the selling price per unit at the retail store?
Answer : 240 :
How many product units must be sold a month to break even?
Answer 68 :
What is the revenue at the break-even point?
Answer 409.09 :
The manager wants to have total profit of $5,000 a month. How many product units must be sold to achieve this goal?
Answer :
Now the manager considers two marketing promotion options.
Option 1: Advertising on a local cable channel next month. The advertising cost is $2,000.
How many product units must be sold to cover the Total Cost (including the advertising cost)?
Answer :
Option 2: Sales promotion next month (10% price discount on selling price).
.How many product units must be sold to cover the Total Cost (including sales promotion cost)?
Answer
In: Accounting
PART IV - ANALYSIS AND INTERPRETATION OF EPIDEMIOLOGIC RESULTS
The following food exposure information was collected through the cohort study. On January 19, the information was tabulated by epidemiologists from the Argentine MOH. (Table 2)
Table 2. Foods eaten by ill and well bus drivers at the home at the terminal bus stop, January 3-7, 1998. (N=21)
|
Food item |
Ate item |
Did not eat item |
||
|
Ill |
Well |
Ill |
Well |
|
|
Bologna |
1 |
0 |
8 |
12 |
|
Hot dog |
1 |
1 |
8 |
11 |
|
Matambre* |
9 |
2 |
0 |
10 |
|
Mate** |
4 |
4 |
5 |
3 |
|
Processed Ham |
2 |
3 |
7 |
9 |
|
Sauce |
7 |
2 |
2 |
10 |
|
Salami |
1 |
1 |
8 |
11 |
|
Solid ham |
2 |
3 |
7 |
9 |
*Matambre is a traditional meat roll in Argentina.
**Mate is green tea.
Question 12: Calculate the appropriate measures of association for these exposures.
Question 13: Interpret the results. What further data analysis/information might help?
In: Biology
2016 2017
Sales $75,000 $90,000 Cost of Goods Sold 45,000 54,000 Gross Profit $30,000 $36,000 Operating Expense 15,000 15,000 Net Income $15,000 $21,000 Compute the corrected net income for 2016 and 2017 assuming that the inventory as of the end of 2016 was mistakenly understated by $7,000.
2016 2017
Corrected net income ______ _______
In: Accounting
Depreciation Methods
Gruman Company purchased a machine for $198,000 on January 2, 2016. It made the following estimates:
| Service life | 5 years or 10,000 hours |
| Production | 180,000 units |
| Residual value | $ 18,000 |
In 2016, Gruman uses the machine for 1,700 hours and produces 45,000 units. In 2017, Gruman uses the machine for 1,200 hours and produces 32,000 units. If required, round your final answers to the nearest dollar.
If Gruman used a service life of 8 years or 15,000 hours and a residual value of $9,000 , what would be the effect on the following under the straight-line, sum-of-the-years'-digits, and double-declining-balance depreciation methods?
Depreciation expense
Straight-line method
2016 $
2017 $
Sum-of-the-years'-digits method
2016 $
2017 $
Double-declining-balance method
2016 $
2017 $
Book value Straight-line method
2016 $
2017 $
Sum-of-the-years'-digits method
2016 $
2017 $
Double-declining-balance method
2016 $
2017 $
In: Accounting