Stat 503 - Study guides, Class notes & Summaries

Statistics Portage CNSL 503 Exam 2

Statistics Portage CNSL 503 Exam 1 Questions and Answers

Statistics - ANSWER-A branch of science chiefly concerned with the collection, analysis, interpretation, and presentation of empirical data. A set of mathematical tools that help us tell stories with data and help us use data to decide which stories to trust. It is used to quantify and manage uncertainty. Variation - ANSWER-An inherent component of all living systems. Uncertainty - ANSWER-Variation and incomplete information. Sampling Error - ANSWER-The variation that we see among multi...

Stat 503 Exam Questions with Correct Answers Numeric or quantitative variables - Answer-- describe traits that are measured or counted - have magnitude and units - are either continuous or discrete - Numeric variables can be treated as categories if: -- The variable is discrete and the number of possible values is small. (e.g. number of children in a household) -- Only a few specific values are included in the data by design (e.g., three dosage levels in an experimental drug trial). Con...

STAT 503 Quiz 1 Questions and Answers Graded A+ Randomization - Answer-allows an experiment to establish a cause-and-effect relationship; under random assignment the groups shouldn't differ significantly with respect to potential confounding variables; randomization of treatments establish a clearer causal relationship and controls for all lurking variables as well as helps to rid bias frequency - Answer-the count of occurrences frequency distribution - Answer-describes the number of tim...

STAT 503 Final Exam Questions and Answers

Is a quantitative variable always measured in numbers? - Answer-Yes Is any measurement that you record from a sample a variable? - Answer-False What is a statistic? - Answer-The measure that is taken from the whole sample as a summary of the sample Sample data skewed to the left, then longer tail is at the... - Answer-Left What is sensitive to outliers? - Answer-Median Formula to calculate standard deviation - Answer-s = sqrt(sum(x1-xbar)^2 / n-1) How to calculate degrees of fr...

STAT 503 EXAM QUESTIONS AND ANSWERS ALL CORRECT What is an outcome? - Answer-Observation of a variable What is a probability model? - Answer-A mathematical description of a random phenomenon consisting of 2 parts (sample space and way of assigning probability to event) What is the multiplication rule? (independent) - Answer-P(AB) = P(A) P(B|A) = P(B) P(A|B) What is the addition rule? (disjoint) - Answer-P(A or B) = P(A) + P(B) - P(AB) If A and B are disjoint, the must be depende...

503 Exam 1 Questions and Answers