Understanding Statistical Studies: Definitions and Methods
Individuals and Variables
Individuals are objects described by a set of data (people, objects, or animals).
Leon Air Base: A Positive Work Environment and Entertaining City
This is Cadet Sargent Reboredo and, as requested, I am submitting this mail in order to give you an appropriate view of the Leon Air Base.
If you were posted with us, I am confident about you would enjoy the place.
Positive Work Environment
We have in our team a group of skilled technicians which are able to solve any breakdown or failure we have to face in our daily routines. The consequence is our aircraft fleet is ready every single day.
Entertaining City
Leon is an entertaining place to live, with
Read MoreMathematics 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 MoreUnderstanding 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
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