Mathematics and Statistics Practice Questions
What is the product of 
and 
?
6×3+29×2+26x-21
What is the product of 
and 
?
6×3+19×2+12x-5
What is the product of 
and 
?
6×3+24×2+x18x-12
What are the zeros of the function 
?
x=-1/2x=-4
What are the zeros of the function 
?
x=-1/2x=-3
What are the zeros of the function 
?
x=-1/2x=-2
What are the solutions of the equation 
?
½ -⅓
What are the solutions of the equation 
?
-½ ⅓
What are the solutions of the equation 
?
-½ -⅓
Which equation shows 
rewritten by completing the square?
Read More
Understanding Generalized Linear Models and Regression Analysis
GENERAL LINEAR MODEL
y=Bo+B1X1+…+BkXk+e. They support inference and prediction. Estimation by Least Squares, Maximum Likelihood,… Interpretable, computation is fast. Simple interactions and transformations are easy. Dummy variables allow the use of categorical information.
GENERALIZED LINEAR MODEL
g(E[y|x])=Bo+B1X1+…+BpXp. Flexible: availability of alternative link functions. They relax some of the assumptions of the linear mode. Example: ogistic regression model, Poisson regression model.
ADDITIVE
Read MoreStatistics and Probability Practice Problems
1)Fill in the blanks or circle the correct answer for the following: a)If P(A∩B)=P(A)P(B) then A and B are called independent. b)Write the type of the variables i) Student’s N# qualitative ii) Student’s age quantitative-discrete c)If we reject Ho at 5% significance level, then we MUST also reject it at 1% level False. d)A type II Error cannot be committed when i) Hois true. e)Probability of Type I Error is called significance level. f)If the confidence level decreases, then the confidence
Read MoreUnderstanding Point Estimates, Confidence Intervals, and Hypothesis Testing
Test 4
Point estimate – single number computed from a sample, which serves as a guess for the parameter.
Estimator – statistic of interest and is therefore a random variable.
Estimate – simply a specific value of an estimator.
Confidence interval – Interval of values constructed so that, with a specified degree of confidence, the value of the population parameter lies within it.
Confidence coefficient – Probability that the CI includes the population parameter in repeated samples.
Confidence level – The
Read MoreMI CIUDAD
I live in Rota, which is a small town on the south coast of Spain, with a population of over 25.000 inhabitants.
Rota is a beautiful city, and it is great for walking aorund. There are a lot of narrow streets, and it is full of bars, markets and there are three churches. There is a beach and in summer people go to Rota for their holidays. There is an area called Costilla where there are a lot of outdoor bars and restaurants and there is a lot of nightlife on Saturdays.
The weather here is very good.
Math Concept Check Chapter 4
What is the connection between cartesian geometry and vector geometry? Given a point P in 3-space we associate three numbers x, y, and z with P. These numbers are called the coordinates of P, and we denote the point (x,y,z) or P(x,y,z) to emphasize the label P. The result is called a Cartesian Coordinate System for 3-space, and the resulting description in 3-space is called Cartesian geometry. Vectors are introduced by identifying each point P(x,y,z) with the vector v->=