|
Total Snowfall (inches) |
11 |
18 |
18 |
13 |
22 |
22 |
21 |
30 |
24 |
|
Visitors |
13 |
14 |
18 |
15 |
22 |
22 |
29 |
44 |
29 |
|
Total Snowfall (inches) |
45 |
27 |
59 |
33 |
49 |
51 |
31 |
64 |
23 |
|
Visitors |
36 |
37 |
42 |
43 |
47 |
51 |
49 |
61 |
51 |
|
Total Snowfall (inches) |
|||||||||
|
Visitors |
Total Snowfall and Number of Visitors at Yellowstone National Park
The table above shows the total snowfall (in inches) and the number of visitors to Yellowstone National Park during 18 randomly selected weeks. (Show all calculations)
1. Based on the variables involved in this relationship which variable do you think is the explanatory (x) variable and which is the response (y) variable?
2. Calculate the correlation between the two variables. r=
3. Interpret the full meaning of the correlation coefficient you calculated in #2, including direction, strength, and relationship between variables.
4. Calculate the average and SD for the variable you chose as the explanatory variable.
Average =
SD =
5. Calculate the average and SD for the variable you chose as the response variable.
Average=
SD=
6. Find the equation of the regression line that fits your data. Show all calculation.
7. Interpret the meaning of the slope of your regression model from question #6
8. Interpret the meaning of the y-intercept of your regression model from question #6. If there is no practical meaning, explain why.
9. Demonstrate how someone might use the regression model you found in question #6 to predict the value of a response variable. That is, plug a hypothetical x-value in your model and explain what it predicts.
In: Statistics and Probability
Evans:
Evans Enterprises has bought a prime parcel of beachfront property and plans to build a luxury hotel. After meeting with the architectural team, the Evans family has drawn up some information to make preliminary plans for construction. Excluding the suites, which are not part of this decision, the hotel will have four kinds of rooms: beachfront non-smoking, beachfront smoking, lagoon view non-smoking, and lagoon view smoking. To decide how many of each of the four kinds of rooms to plan for, the Evans family will consider the following information.
After adjusting for expected occupancy, the average nightly revenue for a beachfront non-smoking room is $175. The average nightly revenue for a lagoon view non-smoking room is $130. Smokers will be charged an extra $15.
Construction costs vary. The cost estimate for a lagoon view room is $12,000 and for a beachfront room is $15,000. Air purifying systems and additional smoke detectors and sprinklers ad $3000 to the cost of any smoking room. Evans Enterprises has raised $6.3 million in construction guarantees for this portion of the building.
There will be at least 120 but no more than 180 beachfront rooms.
Design considerations require that the number of lagoon view rooms be at least 1.5 times the number of beachfront rooms, and no more than 2.5 times that number.
Industry trends recommend that the number of smoking rooms be no more than 50% of the number of non-smoking rooms.
There should be at least 45 rooms of each kind.
What is the optimal solution?
What is the optimal value of the objective function?
For what values of the objective coefficient will the above solution be valid? Include ranges for all decision variables.
If the budget increases to 7 million what is the change in the objective function? What is the shadow price for budget?
In: Operations Management
|
7- Which one is faster in term of speed USB 3.1 or Thunderbolt 3? |
|
8- Assume motherboard does not have built-in superspeed USB. What would you do if you want to use USB? |
|
9- How many USB devices can USB host controller can support? |
|
10- What are the two common keyboard layouts? |
|
11- What is the main difference between standard keyboards and Ergonomic keyboards? |
In: Computer Science
Markets generally lead to efficient use and allocation of
resources, but sometimes at the cost of equity. Many have observed
a trade-off between efficiency and equity, or growth in income and
wealth inequality as the economy becomes more efficient.
Bill Gates made the following statement: "Yes, some level of
inequality is built into capitalism.... It is inherent to the
system. The question is, what level of inequality is acceptable?
And when does inequality start doing more harm than good?"
In: Economics
Q1: what does the efficient frontier represents?
Q2: how do we estimate the return and standard deviation of a newly built portfolio from analyzing the stocks in that portfolio?
Q3: in the regression equation, what is meant by a regression that has an R-square with 0.95 and how does it compare with a regression with a R-square of 0.30?
Q4: why do we use adjusted beta?
Q5: what is the information ratio and why do we use it?
In: Finance
For these of string functions, write the code for it in C++ or Python (without using any of thatlanguage's built-in functions) You may assume there is a function to convert Small string into the language string type and a function to convert your language's string type back to Small string type.
1. int [] searchA,ll(string in...str, string sub): returns an array of positions of sub in in...str or an one element array with -1 if sub doesn't exist in in...str
In: Computer Science
Write a program named “hw2-extra.py” that will find duplicate numbers in an array.Here is a
sample run of the program. An example for an input is as follows. The program tells you “The
7
duplicate numbers: 2 3 7 1”.
Again, do not use built-in functions if there is any.
You can read
the input from the file named as “hw2-ExtraCredit.txt”
235231779 13 15 99 96 4 1
The duplicate numbers: 2 3 1 7
In: Computer Science
a) Explain differential movement and prevention in brick and concrete masonry. Where the control joints are must be located.
b) A 150 –ft exterior clay brick wall is designed for ½ -in expansion joints and a joint compressibility of 40 %. Determine the maximum joint spacing and the minimum number of joints required for entire wall. (Wall is going to be built in Lubbock TX. Temperature difference can be taken as 80ºF. Annual mean relative humidity is moderate 75>AMRH>50)
In: Civil Engineering
Q1: what does the efficient frontier represents?
Q2: how do we estimate the return and standard deviation of a newly built portfolio from analyzing the stocks in that portfolio?
Q3: in the regression equation, what is meant by a regression that has an R-square with 0.95 and how does it compare with a regression with a R-square of 0.30?
Q4: why do we use adjusted beta?
Q5: what is the information ratio and why do we use it?
In: Finance
Which of the following is true?
a. Catabolism is degradative, in which organic molecules are converted into smaller, simpler end products with the consumption of energy.
b. Anabolism is degradative, in which organic molecules are converted into smaller, simpler end products with the consumption of energy.
c. Catabolism is degradative, in which organic molecules are converted into smaller, simpler end products with the release of energy.
d. Catabolism is synthetic, in which small simple precursors are built up into organic molecules with the consumption of energy.
e. Anabolism is synthetic, in which small simple precursors are built up into organic molecules with the release of energy.
Which of the following is true?
a. Enthalpy, H, is the heat content of the reacting system. If a reaction consumes heat is it called exothermic, because it is taking heat from its external surroundings.
b. Entropy, S, is a quantitative expression for the order in a system. The universe tends to move away from entropy.
c. Gibbs free energy, G, expresses the amount of energy available to do work. The temperature and pressure are not relevant.
d. Enthalpy, H, is negative when a reaction is exothermic, because the reaction is releasing heat.
e. Gibbs free energy, G, is positive when a reaction is thermodynamically favorable because it takes energy to make reactions proceed.
In: Biology