Distributions
If you graph a normally distributed set of data, what will the shape of that graph be?
Bell-shaped
Give one example of a population parameter
mu or sigma
One card is drawn from a standard 52-card pack of cards. All the cards have an equal chance of being picked. What is the chance I did NOT pick a face card?
10/13
One of the most common statistics worldwide is a periodic count of the population. What is this known as?
Census
Appropriate graphical summary of the distribution of a categorical variable
Bar Graph
If something involves a binomial distribution, it must be able to meet four conditions. One is a fixed number of distributions. Second is a fixed probability of success for each trial. The third is each observation falls into just one of two categories (success or fail). The fourth condition is that each observation is what?
Independent
This sampling method divides the groups homogeneously (or are similar) before taking a sample
Stratified sampling
What is the area under the curve of any probability distribution called?
One square unit
Given a two-way table with four rows and three columns, which formula is used to compute the number of Degrees of Freedom (DF) to conduct a Chi-Square Test of Association/Independence?
(# of Rows -1) x (# of Columns -1)
The number of points scored in an NBA season for a team has the following statistics: Games played is 82, mean = 99.6, mode = 104, and median = 102. How would you describe a graph of this data?
Skewed Left
Continuous Random Variables: If U~Uniform(0,1) and X~Exponential(1). Then which one is true:
X = log U
X = exp(U)
X = -exp(U)
X = -log U
X = -log U
When you treat replicate measurements as independent when they are not independent
Pseudoreplication
Two six-sided dice are rolled. Find the probability that the sum is 8 given that the first die was 3
1/6
1.618033989
Golden Ratio
Which description best compares the graphs given by the equations x – 5y = -5 and 5x – 25y = 75?
A) Perpendicular
B) Parallel
C) Coinciding
D) Intersecting but not perpendicular
B) Parallel
Conditional Expectation: If X|Y~Normal(2Y,3Y) and Y~Poisson(5). Which of the following is E(X)?
2
5
6
10
10
When I pick a sample size, this fraction will tell me the probability that the procedure will detect a "true" difference if the difference does exist in the population. We call this fraction ________?
Power
Eight cardboard boxes are standing on the table. Two among them contain a present, the other six are empty. You are allowed to open two boxes. How much chance do you have to find at least one present?
13/28
Which scientist, more famously known as an astronomer than a statistician, put forward the suggestion in the 16th Century that we should "Measure what can be measured, and make measurable what cannot be measured"?
Galileo Galilei
What is the purpose of a waterfall chart?
It is used for analytical purposes, especially for understanding or explaining the gradual transition in the quantitative value of an entity which is subjected to increment or decrement; often used to show changes in revenue or profit
Central Limit Theorem: Let X1,...,Xn be independent and identically distributed with Poisson(m). When n is large, what is the approximate distribution of ∑Xi, i=1,...,n?
Normal(mn,mn)
For the ______ distribution.
This is the formula to calculate the sample size needed to detect a different change from λ1 to λ2
Sample Sizegroup=4/(√λ1 - √λ2)2
Poisson Distribution
The probability of picking a red marble from a bag of red, blue, and yellow marbles is 7/15. The probability of picking a yellow marble is 20%. There are 15 blue marbles in the bag. How many total marbles are there in the bag?
45
Probability of this occuring in the US in any given year is 1/700 000
Probability of this occuring in a lifetime the US is 1/3,000
Mexico has the highest number of deaths due to this
Lightning
What is a sunburst chart?
A multi-level pie chart used to illustrate hierarchical data using concentric circles