WHS AP Statistics - Unit 4

Front

What happens to the mean if a constant is added to every value in a data set?

Back

The mean increases by that constant.

Front

What percentage of data falls within one standard deviation of the mean in a normal distribution?

Back

68%.

Tags

CCSS.HSS.ID.A.4

Front

What is the probability of either event A or event B occurring if they are mutually exclusive?

Back

P(A or B) = P(A) + P(B).

Tags

CCSS.HSS.CP.B.7

Front

In a normal distribution, what does it mean if 95% of data falls between two values?

Back

It indicates that those values are approximately 1.96 standard deviations from the mean.

Tags

CCSS.HSS.ID.A.4

Front

What is the mean and standard deviation if 95% of students weigh between 62 kg and 90 kg?

Back

Mean = 76 kg, S.D. = 7 kg.

Tags

CCSS.HSS.ID.A.4

Front

How do you calculate the proportion of data below a certain value in a normal distribution?

Back

Use the Z-score formula and standard normal distribution tables.

Tags

CCSS.HSS.ID.A.4

Front

What is the standard deviation in a data set?

Back

It measures the amount of variation or dispersion of a set of values.

Front

If the mean number of accidents is 6.4 with a standard deviation of 1.5, what proportion of weeks would have less than 5 accidents?

Back

Approximately 0.1762.

Tags

CCSS.HSS.ID.A.4

Front

What is a mutually exclusive event in probability?

Back

Events that cannot occur at the same time.

Tags

CCSS.HSS.CP.A.2

CCSS.HSS.CP.A.4

Front

What is the empirical rule in statistics?

Back

In a normal distribution, about 68% of data falls within one standard deviation, 95% within two, and 99.7% within three standard deviations.

Tags

CCSS.HSS.ID.A.4