2.1 Reflections

What percentile is Q1?

• 25th

• 50th

• 75th

• 90th

Answer explanation

Q1 represents the 25th percentile, which is the correct choice.

What percentile is the median?

• 25th

• 90th

• 75th

• 50th

Answer explanation

The median is the value that divides a dataset into two equal halves. In this case, the correct choice is 50th percentile because it represents the middle value of the dataset.

What does a positive Z-Score indicate?

• Data value is above the mean

• Data value is below the mean

• Data value is equal to the mean

• Data value is not significant

Answer explanation

A positive Z-Score indicates that the data value is above the mean.

What does a negative Z-Score indicate?

• Data value is above the mean

• Data value is below the mean

• Data value is equal to the mean

• Data value is not significant

Answer explanation

A negative Z-Score indicates that the data value is below the mean.

What does a Z-Score of 0 indicate?

• Data value is above the mean

• Data value is below the mean

• Data value is equal to the mean

• Data value is not significant

Answer explanation

A Z-Score of 0 indicates that the data value is equal to the mean.

What percentile is Q3?

• 25th

• 50th

• 75th

• 90th

Answer explanation

Q3 represents the 75th percentile, which means that 75% of the data falls below this value. Therefore, the correct choice is 75th.

What does a Z-Score of 1 indicate?

• Data value is one standard deviation above the mean

• Data value is one standard deviation below the mean

• Data value is equal to the mean

• Data value is not significant

Answer explanation

A Z-Score of 1 indicates that the data value is one standard deviation above the mean.

What does a negative Z-Score of -1 indicate?

• Data value is one standard deviation above the mean

• Data value is one standard deviation below the mean

• Data value is equal to the mean

• Data value is not significant

Answer explanation

A negative Z-Score of -1 indicates that the data value is one standard deviation below the mean.

What percentile is Q2?

• 25th

• 50th

• 75th

• 90th

Answer explanation

Q2 represents the 50th percentile, which means that 50% of the data falls below it. Therefore, the correct choice is 50th.

What does Z-Score of a data value mean?

• The distance a value is from the mean.

• The number of standard deviations a value is from the mean.

• The average distance a value is from the mean.

• The score that comes after the Y-Score.