There have been close to 50 different types of bias identified in epidemiological practice and research, but nearly all can be broken down into two major bias categories: Information bias and selection bias. Select one of these biases and discuss the origin of this bias, common mistakes in epidemiological studies that create this bias, and methods to help reduce the referenced bias in epidemiological research and practice.
In: Biology
(a) You took two 50-g ice cubes from your −15 C kitchen freezer and placed them in 200 g of water in a thermally insulated container. If the water is initially at 25 C, what is the final temperature at thermal equilibrium? (b) What is the final temperature if only one ice cube is used? Hint: Watch out for the different possibilities!
In: Physics
Based on the number of students dine in Deer Park Tavern, the manager determines that following number of waiters and waitresses are needed for each day of a week:
| Mon | Tue | Wed | Thur | Fri | Sat | Sun |
| 5 | 7 | 9 | 8 | 10 | 9 | 5 |
The manager hires full time workers (waiters or waitresses) who normally work consecutively for 5 days followed by 2 day off. Additional part time workers can be hired who are required to work two days in a row. Part time workers are paid 25% more daily. Assuming that all workers are equally paid (you may assume $1/day for full time workers) within each category, respectively. In addition, to maintain the quality of service, part time workers on each day should be no more than 40% of full time workers.
Set up an Excel LP model to find a shift schedule for the manager to minimize the operating cost.
In: Operations Management
Students and faculty alike are concerned about the cost of textbooks. A committee of both students and faculty searched the internet for appropriate books that would be available for less than $60. A random sample of 40 texts gave a mean of $65.12 with a standard deviation of $23.08. At the 5% level of significance, do the texts selected in the sample cost significantly more than the amount the committee considered appropriate?
(1) List all the information necessary for conducting the hypothesis test and state which
test you are doing.
(2) State the null and alternative hypotheses and whether you would use a right-tailed
test, a left-tailed test, or a two-tailed test.
(3) Sketch the critical reason, indicating on the sketch what the critical value(s) are.
(4) Determine the calculated z or t.
(6) Decide if you will Reject or Fail to Reject the Null Hypothesis.
(7) Interpret your conclusion in terms of the problem.
(8) If there are any questions to be answered in the problem, do so.
In: Statistics and Probability
Programing assignment in C++
The following description has been adopted from Deitel & Deitel. One of the most popular games of chance is a dice game called "craps," which is played in casinos and back alleys throughout the world. The rules of the game are straightforward:
A player rolls two dice. Each die has six faces. These faces contain 1, 2, 3, 4, 5, and 6 spots. After the dice have come to rest, the sum of the spots on the two upward faces is calculated. If the sum is 7 or 11 on the first throw, the player wins. If the sum is 2, 3, or 12 on the first throw (called "craps"), the player loses (i.e. the "house" wins). If the sum is 4, 5, 6, 8, 9, or 10 on the first throw, then the sum becomes the player's "point." To win, you must continue rolling the dice until you "make your point." The player loses by rolling a 7 before making the point.
Write a program that implements a craps game according to the above rules. The game should allow for wagering. This means that you need to prompt that user for an initial bank balance from which wagers will be added or subtracted. Before each roll prompt the user for a wager. Once a game is lost or won, the bank balance should be adjusted. As the game progresses, print various messages to create some "chatter" such as, "Sorry, you busted!", or "Oh, you're going for broke, huh?", or "Aw cmon, take a chance!", or "You're up big, now's the time to cash in your chips!"
Use the below functions to help you get started! You may define more than the ones suggested if you wish!
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(5 pts) void print_game_rules (void) — Prints out the rules of the game of "craps". |
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(5 pts) double get_bank_balance (void) - Prompts the player for an initial bank balance from which wagering will be added or subtracted. The player entered bank balance (in dollars, i.e. $100.00) is returned. |
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(5 pts) double get_wager_amount (void) - Prompts the player for a wager on a particular roll. The wager is returned. |
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(5 pts) int check_wager_amount (double wager, double balance) - Checks to see if the wager is within the limits of the player's available balance. If the wager exceeds the player's allowable balance, then 0 is returned; otherwise 1 is returned. |
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(5 pts) int roll_die (void) - Rolls one die. This function should randomly generate a value between 1 and 6, inclusively. Returns the value of the die. |
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(5 pts) int calculate_sum_dice (int die1_value, int die2_value) - Sums together the values of the two dice and returns the result. Note: this result may become the player's point in future rolls. |
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(10 pts) int is_win_loss_or_point (int sum_dice) - Determines the result of thefirstdice roll. If the sum is 7 or 11 on the roll, the player wins and 1 is returned. If the sum is 2, 3, or 12 on the first throw (called "craps"), the player loses (i.e. the "house" wins) and 0 is returned. If the sum is 4, 5, 6, 8, 9, or 10 on the first throw, then the sum becomes the player's "point" and -1 is returned. |
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(10 pts) int is_point_loss_or_neither (int sum_dice, int point_value) - Determines the result of any successive roll after the first roll. If the sum of the roll is the point_value, then 1 is returned. If the sum of the roll is a 7, then 0 is returned. Otherwise, -1 is returned. |
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(5 pts) double adjust_bank_balance (double bank_balance, double wager_amount, int add_or_subtract) - If add_or_subtract is 1, then the wager amount is added to the bank_balance. If add_or_subtract is 0, then the wager amount is subtracted from the bank_balance. Otherwise, the bank_balance remains the same. The bank_balance result is returned. |
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(5 pts) void chatter_messages (int number_rolls, int win_loss_neither, double initial_bank_balance, double current_bank_balance) - Prints an appropriate message dependent on the number of rolls taken so far by the player, the current balance, and whether or not the player just won his roll. The parameter win_loss_neither indicates the result of the previous roll. |
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(10 pts) Others? |
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(20 pts) A main ( ) function that makes use of the above functions in order to play the game of craps as explained above. Note that you will most likely have a loop in your main ( ) function (or you could have another function that loops through the game play). |
Have a great time with this assignment! There is plenty of room for creativity! Note: I have not stated how you must display the game play! You may do as you wish!
1-Your project must contain one header file (a .h file), two C source files (which must be .c files), and project workspace.
In: Computer Science
1.Barlow Company manufactures three products: A, B, and C. The selling price, variable costs, and contribution margin for one unit of each product follow:
Product
A B C
Selling price $ 240 $
350
$ 300
Variable expenses:
Direct materials 32 80 40
Other variable expenses 136 130 185
Total variable expenses 168 210 225
Contribution margin $ 72 $ 140 $ 75
Contribution margin ratio 30 % 40 % 25 %
The same raw material is used in all three products. Barlow Company has only 4,000 pounds of raw material on hand and will not be able to obtain any more of it for several weeks due to a strike in its supplier’s plant. Management is trying to decide which product(s) to concentrate on next week in filling its backlog of orders. The material costs $8 per pound.
Required:
1.
Compute the amount of contribution margin that will be obtained per pound of material used in each product.
2a. Compute the amount of contribution margin on each
product.
2b.
Which order would you recommend that the company work on next week—the orders for product A, product B, or product C?
Product A
Product B
Product C
3.
A foreign supplier could furnish Barlow with additional stocks of the raw material at a substantial premium over the usual price. If there is unfilled demand for all three products, what is the highest price that Barlow Company should be willing to pay for an additional pound of materials?
2.
Bed & Bath, a retailing company, has two departments, Hardware and Linens. The company’s most recent monthly contribution format income statement follows:
Department
Total Hardware Linens
Sales $ 4,080,000 $ 3,030,000 $ 1,050,000
Variable expenses 1,222,000 817,000 405,000
Contribution margin 2,858,000 2,213,000 645,000
Fixed expenses 2,210,000 1,340,000 870,000
Net operating income (loss) $ 648,000 $ 873,000 $
(225,000 )
A study indicates that $375,000 of the fixed expenses being charged to Linens are sunk costs or allocated costs that will continue even if the Linens Department is dropped. In addition, the elimination of the Linens Department will result in a 19% decrease in the sales of the Hardware Department.
Required:
If the Linens Department is dropped, what will be the effect on the net operating income of the company as a whole?
In: Accounting
Scenario: Prior to Opening, Part I: You plan to open a pet-services business that will offer dog grooming, day care, and boarding. You can be creative in deciding the name of your business (e.g., “Inspiring Dog Care”), its geographical location (e.g., Chicago), and its mission and vision for adding value to the community. You will be asked to make choices for a few other details to customize your case; otherwise, you should use the information below. There are 12 kennels (single dog only) and the day care area can house 10 large dogs and 12 small dogs each day. The grooming facility is 200 square feet, the boarding facility is 2,500 square feet, and the day care is 1,500 square feet. Your groomer can groom five dogs a day for five days a week; each groom consists of 1.5 labor hours. You also offer dog day care six days a week, and kenneling every day. You have taken out a loan for start-up costs and the monthly payment is $420; it goes into effect immediately and should be accounted for in your costs. With limited cash contribution and loan funding, you located two angel investors. You will collect a modest draw for the first year of $600 a month; remember to divide evenly among the services. Note: For simplicity, base all calculations using 30 days in each month.
You have hired the following people:
? A groomer, Allison, who will be paid $12/hour and work 40 hours a week
? A day care attendant, Beverly, who will be paid $9/hour and will work based on need
? A receptionist, Cathie, who will be paid $8.50/hour and work 30 hours a week
? A kennel attendant, Ben, who will be paid $11.50/hour and will work based on need A complete list of additional costs is provided below:
? Food and water bowls: $3.59/unit o Daycare: Two bowls last for every 75 dogs that attend daycare. o Boarding: Two bowls last for every 100 dogs that are boarded; you need two bowls per kennel. o Grooming: Each bowl lasts for 20 grooms and you need four bowls at all times.
? Fencing for daycare area: $1,249
? Installation of fencing: $1,000
? Dog grooming arm: $300
? 12 kennels: $9,500
? Kennel depreciation is $80/month
? Rent: $650/month; allocate based on square footage
? Utilities/insurance: $600/month; allocate based on square footage
? Grooming table: $900
? Grooming tub: $2800
? Heating system: $10,000
? Heating system depreciation is $83/month; allocate based on square footage
? Clippers: $136.99; can be used for 100 grooms
? Shampoo: $103.96 per five-gallon pail, which can be used for 100 grooms
? Cage bank: $2200 per set of 5
? Salon Tuff Capri mobile carry cart: $90
? Towels: $34.99 per 12 pack o Day care: You need to have 12 towels for every 25 dogs. o Boarding: You need to have 12 towels for every 40 dogs. o Grooming: You need to have two towels for every groom per day.
? Scissors: (1) 7-inch straight is $194.99, and (1) ear-and-nose is $7.49; each can be used for 200 grooms.
? Toys: $3.29 per 6-pack; one toy will last for two dogs in day care, per day.
? Cleaning products: o Odoban: $14.55/gallon: Each area will dilute 1 oz to 1 gallon of water; allocate based on square footage. o Simple Green: $15.66/gallon: each area will dilute 1 oz to 1 gallon of water; allocate based on square footage.
? Dryer: $1250
? Rubberized flooring for day care: $3800
? You have taken out a loan for start-up costs and the monthly payment is $420; it goes into effect immediately and should be accounted for in your costs.
? You will collect a modest draw for the first year of $600 a month
*FOR EACH ABOVE ITEM OR COST, CLASSIFY AS: DIRECT MATERIALS, DIRECT LABOR, MANUFACTURING OVERHEAD OR PERIOD COST*
In: Accounting
Consider the following set of vectors in R6
S={[-9 7 -8 3 0 -5], [1 -7 3 2 -8 -8], [-6 -14 1 9 -23 -29], [11 -21 14 1 -16 -11], [8 16 -8 8 10 1], [17 -7 13 -8 8 18]
(a) (2 points) Demonstrate that S is not a basis for R6.
(b) (4 points) Let H = Span S. Find a basis for H and determine its dimension.
(c) (2 points) Determine whether v= [1,1,1,−1,−1,−1] ^T belongs in H or not.
(d) (6 points) Find a basis for R6 consists of the basis vectors of H found in part (b) and some additional linearly independent vectors.
(e) (4 points)Suppose A is a 6×6 matrix and T(x) =Ax. Show that T(H), the set of images of vectors of H, is a subspace of R6.
(f) (3 points) Show that dimT(H)≤dimH
(g) (4 points) Suppose A is invertible. Show that dimT(H) = dimH.
(h) (5 points)Suppose K is a 4 dimensional subspace of R6. Show that Hand K must have a nonzero vector in common.Hint: Start with bases for the two subspaces. If H andKonly have the trivial vector in common, then what’s a basis for the subspace H+K?
In: Advanced Math
Chevron Corporation's audited financial statements for the year ended December 31, 2019, included the following information: sales were $150 billion, the cost of goods sold was $130 billion, total assets were $100 billion and 50% of the company's assets were financed with debt. What was Chevron's total asset turnover in 2019? Please show work.
In: Finance
Sub: Test on Hypothesis (Maths)
Kindly solve the sum and provide the detailed step by step method:-
A random sample of size 15 has 50 as mean, the sum of the squares of the deviation taken from mean is 130.Can this sample be regarded as taken from the population having 53 as mean?. Obtain 95% and 99% confidence limits of the mean for the population.
In: Statistics and Probability