AP Stats Semester 1 Review

Front

What is reliability in the context of manufacturing?

Back

Reliability is defined as the proportion of non-defective items produced over the long term.

Front

How do you calculate the expected number of non-defective items in a sample?

Back

Multiply the total number of items in the sample by the reliability percentage (e.g., for 2000 bulbs with 93% reliability: 2000 * 0.93 = 1860).

Front

What is the probability of independent events occurring together?

Back

Multiply the probabilities of each independent event. For example, if the probability of Joe buying a book is 0.25 and Matthew's is also 0.25, the probability they both buy a book is 0.25 * 0.25 = 0.0625.

Front

What is a simple random sample?

Back

A simple random sample is a subset of individuals chosen from a larger set, where each individual has an equal chance of being selected.

Front

Which method produces a simple random sample?

Back

Number the students in the official school roster and use a table of random numbers to choose 80 students.

Front

What does a boxplot represent in statistics?

Back

A boxplot visually summarizes the distribution of a dataset, showing the median, quartiles, and potential outliers.

Front

What can you infer if one boxplot has a larger range than another?

Back

The dataset with the larger range has more variability in its values compared to the dataset with the smaller range.

Front

What is a z-score?

Back

A z-score indicates how many standard deviations an element is from the mean of the dataset.

Front

How do you interpret a z-score of 1.75?

Back

A z-score of 1.75 means the value is 1.75 standard deviations above the average of the dataset.

Front

What does it mean if a z-score is negative?

Back

A negative z-score indicates that the value is below the mean of the dataset.