Sampling & Experiments
Interpretations
Important Things You May Have Forgotten
Probability Rules!
Calculator Commands
100
Neither the subject nor those who measure the reponse variable know which treatment a subject received.
What is a double-blind experiment?
100

standard deviation

What is the typical or average distance from the mean?

100
How to identify outliers for univariate data
What is Q1 - 1.5(IQR) and Q3 + 1.5(IQR)?
100
The rule for finding 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) = P(4)^3?
100
The correlation coefficient between L1 and L2
What is STAT-->CALC-->8:LinReg(a+bx) L1, L2?
200
A common form of blocking for comparing just two treatments.
What is matched pairs?
200
The slope in the least-square regression line, y = 15 - 4x
What is "For every one unit increase in the explanatory variable, there is on average a 4 unit decrease in the reponse variable"?
200
The expected value of a discrete random variable
What is the mean of the random variable found by summing the products of the values of x and their repsective probabilities?
200
The rule for the probability of pulling a red or queen from a standard deck of cards.
What is P(red or queen) = P(red) + P(queen) - P(red and queen)?
200
The probability of at least 8 successes in 12 trials given a probability of success of 45%.
What is DISTR (or 2nd VARS)--> 1-binomcdf(12,.45,7)?
300
When some groups in the population are left out of the process of choosing a sample
What is undercoverage?
300
A z-score of -3.45
What is "The data value is 3.45 standard deviations below the mean"?
300

How to determine if two events, A and B, are independent

What is P(B|A) = P(B) or P(A and B) = P(A)P(B)?

300
The rule for finding the probability of a female given that they are an AP Stats student.
What is P(Female|AP Stats Student) = P(Female AP Stats Student)/P(AP Stats Student)
300

What is P(X<1.6) if X is a standard normal RV?

What is DISTR (or 2nd VARS)--> 

normalcdf(lower=-1E99, upper=1,6, mean=0, sd=1)?

400
The population is divided into groups. Some groups are randomly selected and all individuals in the chosen groups are sampled.
What is cluster sampling?
400

r^2=0.66

What is "about 66% of the variation in y can be accounted for by the least squares regression with x."
400

The standard deviation of the difference between two random variables.

What is the square root of the sum of the variances of the two random variables?

400
The rule for finding the probability of obtaining the first success on the 5th trial.
What is P(X=5) = p(1-p)^4
400
The probability that I get heads before the 6th try?

What is geometcdf(p=0.5, x=5)?

500
The effects of two variables on the response cannot be distinguished from each other.
What is confounding?
500

s=40

What is "the actual y values are typically about 40 away from the predicted y values"?

500

actual y - predicted y

What is a residual?

500
The rule for finding 10 successes in 15 trials.
What is P(X=10) = (15 C 10)*p^10*(1-p)^5
500
Ten random intergers from 1 to 100.
What is MATH--> PRB--> 5: RantInt(1,100,10)
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