Sampling & Experiments
Important Things You May Have Forgotten
Probability Rules!
Calculator Commands
100

In this experiment type neither the subject nor those who measure the response variable know which treatment a subject received.

A double-blind experiment

100
How to identify outliers for univariate data
What is Q1 - 1.5(IQR) and Q3 + 1.5(IQR)?
100

The probability of rolling a fair die three times and getting three fours.

(1/6)3 = 0.0046

100

How do you find the correlation coefficient between L1 and L2?

STAT-->CALC-->8:LinReg(a+bx) L1, L2

200

What is a common form of blocking for comparing just two treatments?

Matched pairs

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

What is the probability rule for determining P(A or B)

P(A or B)=P(A) + P(B) - P(A and B)

200

What is the equation of the probability of at least 8 successes in 12 trials given a probability of success of 45%

1-binomcdf(12,.45,7)?

300

This is when some groups in the population are left out of the process of choosing a sample

Undercoverage

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

Write the formula for finding the probability a student is female given that they are an AP Stats student.

P(Female|AP Stats Student) = P(Female and AP Stats Student)/P(AP Stats Student)

300

How do you find the z-score for a percentile of 92%?

What is DISTR (or 2nd VARS)--> invNorm(.92,0,1)?

400

In this sampling type, the population is divided into groups. Some groups are randomly selected and all individuals in the chosen groups are sampled.

Cluster sampling

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

Write the equation for the probability of obtaining the first success on the 5th trial of a chance process with probability p of success. 

P(X=5) = (1-p)4(p)

500

This happens when the effects of two or more variables on the experimental outcome cannot be distinguished from each other.

What is confounding?

500
The mean and standard deviation of the sampling distribution of sample means
What is the mean of the sampling distribution of sample means is equal to the population mean and the standard deviation of the sampling distribution of sample means is equal to the population standard deviation divided by the square root of the sample size?
500

Write the equation for finding the probability of 10 successes out of 15 trials with the probability p of success.

P(X=10) = (15 nCr 10)(p)10(1-p)5

500

How would you generate ten random integers from 1 to 100?

MATH--> PRB--> 5: RantInt(1,100,10)

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