2.1 Warmup

The z-score represents.....

• the amount of standard deviations a data value is above or below the mean.
• the percentile the data value is above or below the mean.
• the amount of standard deviations a data value is above or below the median.
• the percent the data value is above or below the mean.

The mean temperature in Glens Falls for the month of February is 23 degrees with a standard deviation of 4.2 degrees.  What is the z-score for a temperature of 17 degrees?  

• 1 
• 1.43
• -1.43
• 11.5

 
Which curve has the greater standard deviation?

• Red
• Black
• Blue

What does this symbol represent?

• Standard Deviation
• Variance
• Mean Absolute Deviation
• Sigma

What does this symbol represent?

• Mean
• Median
• Mode 
• Standard Deviation

The 40 yards sprint times for a soccer team are found to be normally distributed with a mean of 5.2 seconds and a standard deviation of 0.3 seconds.  What is the z-score for a player who runs a time of 4.6 seconds?

• 0.83
• 1.07
• -2
• -1.07

Jorge’s score on Exam 1 in his statistics class was at the 64th percentile of the scores for all students.His score falls

• between the minimum and the first quartile.

• between the first quartile and the median.

• between the median and the third quartile.

• between the third quartile and the maximum.

• at the mean score for all students.

Scores on the ACT college entrance exam follow a bell-shaped distribution with mean 18 and standard deviation 6. Wayne’s standardized score on the ACT was −0.5. What was Wayne’s actual ACT score?

• 5.5

• 12

• 15

• 17.5

• 21

What is the interquartile range (IQR) for the distribution below? (Ogive is given)

• 1

• 2

• 3

• 5

• 14

If the distribution of absences was displayed in a histogram, what would be the best description of the histogram’s shape?

• Symmetric

• Uniform

• Skewed left

• Skewed right

• Cannot be determined