Name that Inference Method
Graphical Displays
SOCS
Probability
Sampling and Bias
100
An article claims that 40% of teenagers get fewer than 8 hours of sleep per night. A high school counselor believes the proportion at her school is higher than the national claim. She randomly selects 80 students from her school and finds that 38 of them get fewer than 8 hours of sleep per night.
1-sample z-test for a proportion
100
Which day has the largest IQR?
Sunday
100
The three measures of center include mean, mode, and this.
Median
100
A bag contains 3 red marbles, 2 blue marbles, and 5 green marbles. If you reach in and pick one marble at random, what is the probability of picking a red marble?
3/10 or 0.30
100
This sampling method assigns every member of the population a number and uses a random number generator to select the sample.
Simple Random Sample (SRS)
200
A research group wants to estimate the difference in the proportion of customers who would recommend a meal kit delivery service between two cities - Austin and Denver. They randomly survey 150 customers in Austin and 130 customers in Denver who have used the service, and record whether each customer would or would not recommend it to a friend.
2-sample z-interval for a difference in proportions
200
What score did Carla get without preparation?
60
200
A data point is considered a potential outlier if it falls more than 1.5 times this value above Q3 or below Q1.
IQR
200
A multiple choice quiz has 10 questions, each with 4 options (only one correct). A student hasn't studied at all and guesses randomly on every question. What distribution should be used?
Binomial Distribution
200
A study asks students to rate their school lunches, but the survey is only given during the first period class. What type of bias is this?
Undercoverage bias
300
A college dining hall manager wants to estimate the average number of minutes students spend eating lunch. She randomly selects 22 students and records how long each one spends at lunch. The sample yields a mean of 18.4 minutes with a standard deviation of 4.7 minutes.
1-sample t-interval for a mean
300
How many total participants were there in this survey?
35 participants
300
What is the shape of the distribution.
Right-skewed
300
In a class of 40 students, 18 play soccer, 15 play basketball, and 7 play both sports. If a student is chosen at random, what is the probability that they play either soccer or basketball?
26/40 or 13/20 or 0.65
300
A researcher surveys every 10th person on a list of registered voters. What is the name of the sampling method?
Systematic sampling
400
A sports scientist wants to determine whether a new 6-week strength training program reduces athletes' 40-yard dash times. He recruits 14 randomly selected college football players and records each player's 40-yard dash time before and after completing the program.
Matched pairs t-test for a mean difference
400
What is the range of times social media is checked for men?
53 times
400
A dataset has values {2, 2, 2, 2, 2}. What is the standard deviation?
0
400
In a class of 40 students, 18 play soccer, 15 play basketball, and 7 play both sports. If you randomly select a student and find out they play basketball, what is the probability that they also play soccer?
7/15 or 0.46667
400
In an experiment, the primary purpose of randomly assigning subjects to treatment groups is to control for this.
Confounding variables
500
A school principal wants to determine whether there is a relationship between students' study habits and their grade level (9th, 10th, 11th, or 12th grade). She surveys a random sample of 200 students and records each student's grade level and whether they study for more or less than 2 hours per night.
Chi-square test for independence
500
Given that a randomly selected person is a snowmobile owner, what is the probability that they are a part of the environmental club?
16/295 or 0.054237
500
When looking at a right skewed distribution, a teacher reports the median salary of graduates rather than the mean. Why is the median preferred?
The median is preferred because it is resistant to outliers.
500
A weather app reports that on rainy days, there is a 70% chance of heavy traffic. Records also show that it rains on 30% of all days. What is the probability that on any given day, it is both raining and experiencing heavy traffic?
0.21
500
In an experiment testing a new painkiller, neither the patients nor the doctors evaluating them know who received the drug or the placebo. What kind of experiment is this?
Double-blind experiment