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
P-value = 0.001
What is "since the P-value is less than any reasonable significance level, we reject the null hypothesis, and conclude there is significance evidence to support the alternative hypothesis"?
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 x and y

What is statistics-->stat calculations->4:Linear Regression (a+bx), X1 List: x, Y1 List: y?

200

An experimental design for comparing just two treatments where subjects are paired with someone similar

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%.

Binomialcdf(p=.45, n=12, L.B.=8, U.B.=12)

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

The z* for a 92% confidence interval

invNorm(area=.04)?

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
95% Confidence level for a poplulation proportion
What is What is "This interval was created using methods that capture the true proportion 95% of the time"?
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.

Geometric, p, X=5

400

The chi-squared test statistic with observed values in ob and expected counts in ex

What is (ob-ex)^2/ex then sum?

500
The effects of two variables on the response cannot be distinguished from each other.
What is confounding?
500
The 95% confidence interval (-4.25, -1.33) for the difference of two means (mean #1 - mean #2).
What is "With 95% confidence, we estimate that mean #1 is between 4.25 and 1.33 units less than mean #2"
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

The rule for finding 10 successes in 15 trials.

Binomial, p, n=15, X=10

500

Show residual plot

x and y data in Lists & Spreadsheets ->Data & Statistics -> x on x-axis, y on y-axis -> Show Linear -> Show residuals

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