bit 3434 exam final
Beta 1 = x1 when comes to regression, so if it says b1 looking at first variable not coefficient
If p value is very small less than 0.05 than we reject the null
What does sum product do
Multiplies each pair of cells in two arrays matched by position
What do we call the probability of the observed test statistics given that the null hypothesis is true
P-Value
Overfitting refers to
Placing too much emphasis on the sample specific noise
What is the category of data mining tasks in which a researcher attempts to predict the value for a continuous response variable based on the data set.
Prediction
What is correct RNG formula for number of children in families
Psi discrete, the # of children A was what we're drawing from b B is just the probability of it happening P(# of children was decimals).
Variables are termed independent when they satisfy which of the following
The function value depends upon their value
Why do we use random number seeds
To evaluate different values for the controllable parameter
What is the data set that is used for learning in data mining, (Model calibration and parameter estimation)
Training dataset
R2 for x1 and x3 the same as x3 separate
X1 doesn't not reduce ESS enough to compensate for its addition to the model
Regression Model
Y = f(X1, x2, ...., xk) + E
100(1-a)% for Y when X = Xh
Y-hat +- t(1-a/2,n-2)Sp
in decision- making problem, anchoring effects occur when
a seemingly trivial factor serves as a starting point for estimation
A set of values for the decision variable that satisfy all the constraints and yields the best objective function value
an optimal solution
When the objective function can increase without ever contacting a constraint the Lp, we call such solution
an unbounded solution
The regression function indicates the
average value the dependent variable assumes for a given value of the independent variable
AS the number of replicates in a simulation increases the width of a confidence interval computed from the simulation results will
decrease
in a transshipment problem, which of the following statements is correct representation of the valance-of0flow rule fi total supply < total demand
inflow- outflow =< Supply or demand
mathematical model is considered to be "Valid" when
it accurately represents the relevant characteristics of the object or decision
Confusion matrix, correct classification outcome
its actual actual + predicted predicted/ total total so 19/25 in ex
How many constraints are there in a transshipment problem which has n nodes and m arcs.
n, its the number of nodes
for diagram of whats feasible
read, look at what it satisfies and then do each part. answer was I,F,G,J
the first step in creating a classification tree involves
recursively partitioning the independent variables using the outcome of previous partitions
in confusion matrix model ability to detect actual positives is
sensitivity recall
_ indicates connections, routes, or paths in a network. In network flow problem, decision variables are represented by
Arcs
What are two activities you need to do before identifying which tools to use?
Run Descriptive analysis and clean the data
in confusion matrix model accuracy is displayed as
precision
Average dmg per car
Psi normal ($C$3*(1+$F$3)^A8,$H$3)
Cell b8 number of cars
Psi uniform ($C$2*1-$F$2), $C$2*(1+$H$2))
What is the name of this variable? a spreadsheet input cell containing a random number generator, any variable whose value cannot be predicted with certainty, and the outcome of a simulation model
Random variable
On average, the differences between the actual and predicted values of Y
Sum to zero
Which step of the problem-solving process is considered the most important
identify problem
When do alternate optimal solutions occur in LP models?
when a binding constraint is parallel to a level curve.
How much of resource 1 consumed by each unit of product 1 produced
2, pay attention its only product 1, so pay attention x1 in product 1
If it has 7 discrete levels
It has 6 binary variables, so if u have n discrete levels then binary variables is n-1
What are the component s in decomposition of the Total of sum squares
TSS = ESS +RSS, The error of sum squares - Residual sum of squares, and RSS
Scaling problems
- can cause problems in accuracy of solutions returned - can cause analytics solver platform to consider a linear problem nonlinear - are cause by small numbers and large numbers used int he same problem its all of these, so all of the above
What is balance of flow constraint for node 3
.80X13 + .95X23 - X35 - X36- X37 = 0. Its just whats happening look at graph. whats in has percentage because its what yielded
what is the balance of flow constraint for node 7
.90X37 +.95X47 = 75. It will end up receiving 75 and end with that amount so it equals that
What are the three common elements of an optimization problem?
Decisions, constraints, an objectives
general format of an objective function
F(X1,X2,....Xn)
an production optimization problem has 4 decision variables and 1 resource that limits them , whats the model
F(X1,X2,X3,X4) =< b1
