Sampling
In this sampling method, a population is split into subgroups based on a shared trait, and random samples are taken from each group.
What is stratified sampling?
Is a sports jersey number categorical or numerical?
What is categorical?
_____________ correlations have data that are in a straight line.
What is perfect?
This is the probability that a fair 6-sided die shows a 2 when rolled once.
What is 1/6?
A __________ variable is counted, such as the number of people in a house, while a __________ variable is measured, such as the weight of each person in the house.
What are discrete and continuous?
This type of bias occurs when certain people are left out of a survey, either on purpose, by accident, or because they choose not to respond.
What is non-response bias?
This measure of spread is calculated by subtracting the smallest value from the largest value in a data set (largest – smallest).
What is range?
For r = 0.82, the direction is ____________ and the strength is ____________.
What is positive and strong?
Taking 9-12 units and taking more than 12 units ________ (are/aren't) mutually exclusive.
What is are?
This is the expected value (mean) of a binomial distribution.
What is n*p?
Student researchers stood outside the library on a Wednesday morning to survey students about a proposed fee increase. This sampling method is considered __________ (random/non-random), specifically called __________ sampling.
What is non-random and convenience?
In a right-skewed distribution, the mean is _________ than the median.
What is greater?
This formula represents the equation for a straight line in a simple linear regression model.
What is y=mx+b?
You draw 2 cards without replacement from a standard deck. What is the probability that both cards are Kings?
What is 4/52 * 3/51?
In continuous distributions, Area = _____________.
What is probability?
A game programmer wants to know if computer games are more effective than paper and pencil drills for children learning the multiplication tables. What would be the best type of study to conduct?
What is experimental study?
This measure of spread is calculated by subtracting the first quartile from the third quartile in a data set, providing the range of the middle 50% of the data.
What is the interquartile range (IQR)?
This process involves using a regression line to make predictions within the range of x values from the sample.
What is interpolation?
I roll two fair six-sided dice, independently of each other. What is the probability that the sum is 9 or higher?
What is 10/36 or 5/18?
According to the Empirical Rule, approximately what percent of data falls within 2 standard deviations of the mean in a bell-shaped (normal) distribution?
A store asks customers to complete a satisfaction survey online by following a link printed on their receipt. These two types of bias are most likely to affect the results.
What is non-response bias and selection bias?
The following are the heights (in inches) of a group of people, listed in ascending order:
58, 62, 64, 67, 70, 73, 75.
What is the five-number summary for this data set?
What are: minimum = 58, Q1 = 62, median = 67, Q3 = 73, maximum = 75?
A car rental company has a regression equation for predicting the total cost (y) of renting a car based on the number of days (x) a customer rents:
y = 50x + 20
What is the predicted total cost for renting the car for 5 days?
What is $270?
These are three ways you can mathematically check whether two events are independent in probability.
What are: P(A|B)=P(A), P(B|A)=P(B), and P(A and B) = P(A)*P(B)
Biologists at the Smithsonian National Zoo estimate African lion weights are normally distributed with mean 340 lbs and standard deviation 38 lbs. Find the z-score for a sample of 30 lions with a mean weight of 300 lbs.
What is -5.8?