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# Unit Practice: Descriptive Statistics

Unit Practice: Descriptive Statistics

Mr. Evans is considering offering a second after-school tutoring session for his math students each week. He records the number of students who attend his current sessions each week. The results from the last twelve weeks are shown in the dot plot below.

Which statement properly describes the data?
The data is symmetric.
The data is skewed right.
The data is skewed left.
There is not enough information to determine if the data is skewed.
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## create a linear relation in the form y=Mx b with the following criteria: the slope is a fraction ( with denomator other then 1/-1), the initial value is between -10 and 10. B) students will create an equation of a line that is parallel to the line that they created in part a. C) create a equation of a line that is perpendicular to the line that they created in part A , with a diffrent initial value than the one used in part a. D) students will graph all three lines using the slope and y- intercept method, making sure to label each line with its equation. E) students will identify as my point(S) of interest on the graph and state any point(S) of intersection.

A:Students will create a linear relation in the form y=Mx b with the following criteria: the slope is a fraction ( with denomator other then 1/-1), the initial value is between -10 and 10. B) students will create an equation of a line that is parallel to the line that they created in part a. C) create a equation of a line that is perpendicular to the line that they created in part A , with a diffrent initial value than the one used in part a. D) students will graph all three lines using the slope and y- intercept method, making sure to label each line with its equation. E) students will identify as my point(S) of interest on the graph and state any point(S) of intersection.

## 7 questions

Write a script to create the following arrays .
Write a function that takes N as input and finds the account balance after N years. Use for loop.
Repeat (a) without using any loop.
3.For ??/2 ? x ? ?/2, with point spacing ?x = 1/50:
Plot sin(x), cos(x), tan(x), and exp(x) in a single plot. Make sin a red line, cos a black dotted line, tan a blue line, and exp a green dashed line. Make a legend. Label your axes and give th.e figure a title. Set the y axis to be -1<y<1. (20 points)
Extra credit. Write a script that finds the x values at which cos(x)=exp(x). (hint: use find function for |cos(x)-exp(x)|<0.001) (5 points)
4- While. Write a script that takes an integer, N, from the user input. Then computes the largest integer k such that 2k<=N. For example, if N =100, then k would be 6, because 2^6=64 100.
Display/print the message showing the k value: ‘the largest integer k is ….’
Hint: initially, set k=0. In a while loop, check if 2^k is less than N, if not, break the loop. (25 points)
Choose only one question (25 points). You can get extra credit for solving two or three questions:
5. Function, switch statement. Write a function that takes two square matrices of the same size and an operator name as inputs and apply the operator on the two matrices. The operator name can be ‘ ’, ‘-‘, ‘*’, and ‘/’. For example, when the function opName input is ‘ ‘, the function calculates A B; when the function opName input is ‘-‘, the function calculates A-B.
Function C = ApplyOp(A, B, opName)
Switch opName
Case ‘ ’
C=…;

In your main script, create the following matrices and call your function with all operators.
A=421020109,B=340715095
Function. You work for an engineering design firm that has been contracted to evaluate the concentration of pollutants. A tall chimney releases (20 kg/s) of smoke into a steady uniform wind of speed (u( m/s)). An expression for the decay of the peak pollutant concentration C(ppm) with distance downwind is given as:
C(x,y,z)=M4??Dx.e?(y2 z2)u4Dx
Assuming that the diffusion coefficient D to be 0.01 m2/s, and the density of air to be ?=1.225kgm3
Write a function which gets the location(x,y,z) and the wind speed, u, as inputs and calculates the pollutant concentration.
Call your function to find how pollution concentration at location (x=3000, y=0, z=10) changes with wind speed 0<u<12 m/s. Plot the pollution concentration vs wind speed.
Loops and flow control. Make function called loopTest(N) that loops through the values 1 through N and for each number n it should display ‘n is divisible by 2’, ‘n is divisible by 3’, ‘n is divisible by 2 AND 3’ or ‘n is NOT divisible by 2 or 3’. Use a for loop, the function mod or rem to figure out if a number is divisible by 2 or 3, and num2str to convert each number to a string for displaying. You can use any combination of if, else, and elseif.

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## computational finance question use matlab

For this assignment, you need to use Matlab to answer these questions. I need the full script, like the sample solution I provided. I provide an example, you can refer to the style of the answer, but the topic is not the same, for reference only.

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