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MGSC 291 Exam 1 Questions and answers
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MGSC 291 Exam 1 Questions and answers
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MGSC 291 Exam 1- questions and answers-the mean or expected value of a discrete random variable
- questions and answers-variance of a discrete random variable
1 - questions and answers-all probability distributions have and area of _____ under them
1/lamda - questions and answers-mean of an exponential distribution
1/lamda - questions and answers-standard deviation of an exponential function
balancing point - questions and answers-another name for the sample mean
bar graph - questions and answers-diagram for categorical (qualitative data). can be horizontal
or vertical. can display parts of a whole or separate values. for nominal put bars in descending
order. for ordinal put bars in order of categories
because they only include discrete variables, whereas normal distributions are continuous -
questions and answers-why do you adjust endpoints for binomial and poisson distributions but
not normal?
biased - questions and answers-a sample is ______ when summary characteristics in the
sample differ systematically from those of the population
big data - questions and answers-data sets so large that traditional methods of storage and
analysis are inadequate
bigger - questions and answers-if extreme observations are added to a dataset, the standard
deviation will get ______
bimodal skewed left - questions and answers-
bimodal skewed right - questions and answers-
Binary (or dichotomous) Variable - questions and answers-a variable with only two possible
values
Binomial Probability Distribution - questions and answers-A probability distribution showing the
probability of x successes in n trials of a binomial experiment.
boxplot - questions and answers-a type of graph used to display patterns of quantitative data.
great for side by side comparisons. shows the 5 number summary
, census - questions and answers-when a survey attempts to use the entire population
central limit theorem - questions and answers-the sampling distribution of a sum or percentage
will become approximately normal as the sample size gets larger
Chebyshev's Inequality - questions and answers-The percentage of the observations that lie
within k standard deviations of the mean is at least 1 - (1/k^2) when k > 1. works for any type of
distribution
close out the equation by adding an end parenthesis and pressing enter - questions and
answers-What do you do if you enter R code and it returns "+"
coefficient of variation - questions and answers-the standard deviation expressed as a
percentage of the mean. used to compare variation in datasets with different units or means
continuous variable - questions and answers-quantitative variable where there is always another
value in between two any values
cross-sectional - questions and answers-when several variables are all measured at the same
time point (or time frame)
cumulative density function - questions and answers-function defined as F(x)=P(X<=x)
data warehouses - questions and answers-vast digital repositories where data is recorded and
stored electronically
descriptive statistics - questions and answers-collecting, organizing and presenting data
discrete variable - questions and answers-quantitative variable with jumps between values
does NOT - questions and answers-in a continuous distribution the PDF ________ yield
probabilities
empirical rule - questions and answers-68%, 95%, 99.7%. only works for unimodal and
symmetric datasets
expected value - questions and answers-the population mean is also called
expected value of a continuous distribution - questions and answers-SIGMA(xp(x))
experiment - questions and answers-a study where treatments are applied. the goal is to make
a statement regarding cause and effect
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