AP Exam Review #1

What does the standard deviation measure?

• The total range of the data

• The average squared distance from the mean

• The middle fifty percent of the distribution

• The median distance from the mean

What is the best description of standard deviation?

• The range of the data

• The mean distance between individual values and the mean

• The median distance between individual values and the mean

• The interquartile range

How is the slope of a regression line interpreted in AP Statistics?

• For a one-unit increase in Y, X increases by the slope value

• For a one-unit increase in X, Y increases by the slope value

• For a one-unit increase in X, Y decreases by the slope value

• For a one-unit increase in X, Y remains constant

What is the correct interpretation of a negative slope in a regression line?

• As Y increases, X decreases

• As X increases, Y also increases

• As X increases, Y decreases

• As Y increases, X also increases

Which statement is false about stratified random sampling?

• Every possible subset of the population has an equal chance of being selected

• Each stratum is sampled using simple random sampling

• It involves dividing the population into strata before sampling

• Strata are based on characteristics known before the sample is selected

In stratified random sampling, what is the purpose of dividing the population into strata?

• To ensure every subset of the population has an equal chance of being selected

• To sample each stratum using complex random sampling

• To ensure samples are taken from groups with similar characteristics

• To increase the variability within each stratum

What does it mean for two events to be mutually exclusive?

• They can occur at the same time

• Knowing one event occurred changes the probability of the other

• They cannot occur at the same time

• The probability of both occurring is the product of their probabilities

What is the shape of the sampling distribution of X bar according to the central limit theorem?

• Skewed to the left

• Skewed to the right

• Uniform

• Approximately normal

What is the standard deviation of the sampling distribution of X bar if the population standard deviation is 2.6 and the sample size is 100?

• 0.26

• 2.6

• 26

• 0.026