The probability of winning the lottery is 50%: Either you
win or you don't
win or you don't
This type of random variable has two possible outcomes ("success" or "failure") with the same probability of "success" on each observation, all observations are independent, and a fixed number of trials (n)
What is a binomial random variable?
This calculator command can be used to find the area under a normal distribution between any two specific values.
What is normalcdf?
This is the most common method to identify outliers for one variable data (spell out the rule specifically)
What is Q1 - 1.5(IQR) and Q3 + 1.5(IQR)?
This phrase is used to describe an observed effect so large that it is unlikely to occur by chance alone.
What is statistically significant?
Do a demo of a power pose!
[answers will vary]
These are events that have no outcomes in common and can never occur simultaneously, for which the addition rule is used.
What are disjoint events (or mutually exclusive events)?
If quantitative data are approximately normally distributed, approximately what percent of the observations are within 1, 2, and 3 standard deviations of the mean? (Give all three answers)
68% Within one SD
95% Within two SDs
99.7% Within three SDs
The population is divided into groups based on those groups having some characteristic that could potentially affect the variable being measured. Then within each group, a random sample is taken.
What is stratified random sampling?
The type of significance test used for the mean of a single population when the standard deviation of the population is unknown.
What is a T test? (One sample T test)
This is how much time per MCQ?
40 q's in 90 minutes; so 2:15 per question
The probability of rolling a fair die three times and getting three fours.
What is P(rolling three 4s) = P(4)*P(4)*P(4) = 1/216
____________ is more resistant to _________ than the mean.
MEDIAN is more resistant to OUTLIERS than the mean.
This is necessary in order to infer that something caused something else
What is random assignment?
These are three different ways that you can satisfy the Normality condition. Any one of them by itself is sufficient
1) The sample size is larger than 30 (CLT)
2) The population is known to be Normally distributed
3) The sample data do not show significant skewness or outliers (prove it with a dotplot, stemplot, or histogram)
Name at least one pro tip for the Investigative Task (FRQ #6)
1) Don't freak out! You got this.
2) Try all parts of the problem, especially the first couple parts
3) Make reasonable guesses and use them in subsequent parts of the problem
The probability of drawing a red or a Queen from a standard deck of cards.
What is P(red or queen) = P(red) + P(queen) - P(red and queen) = 28/52
The square of the standard deviation
What is the variance?
Give an example of a situation where you want the difference of means, AND an example of a situation where you want a mean difference.
[Answers will vary]
The conclusion if the p-value is 0.001 given an alpha = 0.05.
"Since the p-value is less than alpha = 0.05, we reject the null hypothesis, and conclude there is significant evidence to support the alternative hypothesis [in context]"?
Bonus: What kind of error is it possible that occurred in this test?
Do you lose points for guessing and getting a multiple-choice question wrong on the AP Statistics Exam?
Heck NO! Guess them all!
The probability you find a defective bag of popcorn is .02, independently. What is the probability the first defective bag will be the 10th bag?
Geometpdf (.02, 10) = .0167
To calculate this for a particular observation, subtract the mean of the distribution from the observed value, then divide by the standard deviation.
What is the z-score (or standardized value)?
The population is divided into groups. Some groups are randomly selected and ALL individuals in the chosen groups are sampled.
What is cluster sampling?
Write the conclusion for a 90% confidence interval (2.45, 3.85) for the average GPA of BTA Seniors.
"We are 90% confident that the true average GPA of all BTA Seniors falls between 2.45 and 3.85."
Bonus: What was the mean GPA in the sample used to create this CI?
You should always include this when describing a distribution, interpreting the slope of an LSRL, concluding a hypothesis test or interval, and really any time you're explaining something
What is CONTEXT of this specific problem? (The specific variable you're measuring or describing)