Types of Samples
What is a Simple Random Sample?
Probability is between __ and ___
What is 0 and 1?
68% of the data is between this many standard deviations from the mean.
What is 1?
The difference between categorical and quantitative.
What is quantitative is for "how many/numbers" and categorical is for qualities (example: colors, etc.)?
A reporter wishes to portray baseball players as overpaid. Which measure of center should he report as the average salary of major league players?
[A] The mean
[B] The median
[C] The mode
[D] Either the mean or the median. It doesn’t matter since they will be equal.
[E] Neither the mean nor the median. Both will be much lower than the actual average salary.
[A] The mean
A sample made up of people who are easy to reach.
What is a convenience sample?
A measure of probability of an event given that another event has already occurred.
What is conditional probability?
A normal density curve has this area value.
What is 1?
The mean and standard deviation of a standardized test statistic (z)
What is 0 (mean) and 1 (standard deviation)?
The Mean < Median. This is the shape of the distribution.
A sample made up of people who self-select into the survey
What is a voluntary sample?
If two events are ________ _______, the probability of them both occurring at the same time is 0.
What is mutually exclusive?
Using the standard normal distribution, find the probability for z that is under -1.63
What is 0.0516?
What is the meaning of SOCS?
What is shape, outliers, center, spread?
Find the mean of the following numbers 88, 45, 62, 73, 97, 20
What is 64.167?
Each group is assigned to one group (and only one group)
What is cluster sampling?
This is the only thing that changes when you add/subtract a constant
What is center?
Using the standard normal distribution, find the probability for z above 1.42.
What is 0.0778?
A method of finding the best model for a linear relationship between the explanatory and response variable.
What is linear regression?
The expected value of the following probability distribution.
X: 1, 2, 3, 4
Y: 0.05, 0.15, 0.5, 0.3
What is 3.05?
The differences between a stratified sample and a Cluster sample.
Stratified: choose a few of ALL groups
Cluster: choose all of a FEW groups.
RANDOMLY!
This is the only thing that stays the same when you multiply/divide by a constant.
What is shape?
Using the standard normal distribution, find the probability for z between -1.63 and 2.45? (use normalcdf)
What is 0.9413?
The abbreviation DOFS is used in linear regression. DOFS is short for these words.
What is: Direction, Outlier, Form, Strength?
A Gym membership card is for $30 per year and entitles the buyer to a $3 discount on each day they come to the gym. The number of days Danica goes to the gym has a mean of 15 with a standard deviation of 2. What are the mean and standard deviation of the net gain Danica receives if she buys a membership card?
What is mean=15 and standard deviation = 6 ?