Stats Unit 5 Flashcard on Probability

Front

What is the definition of standard deviation?

Back

Standard deviation is a measure of the amount of variation or dispersion in a set of values. A low standard deviation indicates that the values tend to be close to the mean, while a high standard deviation indicates that the values are spread out over a wider range.

Front

How do you calculate the mean of a data set?

Back

To calculate the mean, add all the numbers in the data set together and then divide by the total number of values.

Front

What is the formula for combinations?

Back

The formula for combinations is C(n, r) = n! / (r!(n - r)!), where n is the total number of items, r is the number of items to choose, and '!' denotes factorial.

Front

What does it mean for a value to be 2 standard deviations above the mean?

Back

A value that is 2 standard deviations above the mean is significantly higher than the average, indicating that it is in the upper range of the data set.

Front

What is the probability of an event?

Back

The probability of an event is a measure of the likelihood that the event will occur, calculated as the number of favorable outcomes divided by the total number of possible outcomes.

Front

How do you find the probability of picking a specific item from a group?

Back

To find the probability of picking a specific item, divide the number of that specific item by the total number of items in the group.

Front

What is the mean height of adult US females?

Back

The mean height of adult US females is 64.5 inches.

Front

What is a sample space in probability?

Back

A sample space is the set of all possible outcomes of a probability experiment.

Front

What is the difference between permutations and combinations?

Back

Permutations consider the order of selection, while combinations do not. In permutations, different orders of the same items are counted as different arrangements.

Front

How do you determine the number of ways to choose a team from a group?

Back

Use the combinations formula C(n, r) to determine the number of ways to choose r items from a group of n items.