MIDTERM PRACTICE EXAM A

Front

What is the Law of Large Numbers?

Back

The Law of Large Numbers states that as the size of a sample increases, the sample mean will get closer to the expected value (population mean).

Front

What does a histogram represent in statistics?

Back

A histogram is a graphical representation of the distribution of numerical data, showing the frequency of data points within specified ranges (bins).

Front

How do you convert velocity from meters per second to kilometers per hour?

Back

To convert velocity from meters per second to kilometers per hour, multiply the value by 3.6.

Front

What is a standardized score (z-score)?

Back

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

Front

What is the probability of an event?

Back

Probability is a measure of the likelihood that an event will occur, expressed as a number between 0 (impossible) and 1 (certain).

Front

How do you calculate the probability of independent events?

Back

For independent events, the probability of both events occurring is the product of their individual probabilities.

Front

What is correlation in statistics?

Back

Correlation measures the strength and direction of a linear relationship between two variables, ranging from -1 (perfect negative) to +1 (perfect positive).

Front

What does a negative correlation indicate?

Back

A negative correlation indicates that as one variable increases, the other variable tends to decrease.

Front

What is the median in a data set?

Back

The median is the middle value of a data set when it is ordered from least to greatest; if there is an even number of observations, it is the average of the two middle values.

Front

What is a sample in statistics?

Back

A sample is a subset of a population used to represent the entire group in statistical analysis.