Final Exam (AFDA)

What shape is a normal distribution curve?

• Half curve
• Round curve
• Bell curve
• Square curve

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

The average waist size for teenage males is 29 inches with a standard deviation of 2 inches. 
If waist sizes are normally distributed, determine the z-score of a teenage male with a 33 inch waist.  

• 2
• 1
• -2
• -1

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.

μ = 70 , σ = 8 , X = 50 . Find z score

• 2.5
• -2.5
• 5.2
• -5.2

Find the Z-score.

Mean = 22

Standard Deviation: 3.1

x = 29

• 2.26

• 16.45

• -2.26

• 1.26

The sign of the z-score indicates whether the location is above(positive) or below(negative) the mean.

• True

• False

A scientist planted two groups of seedlings. After six months, she found that the heights for both groups were normally distributed with means and standard deviations as follows:

Group A: Mean = 41.7 cm, Standard Deviation = 2.2 cm

Group B: Mean = 38.6 cm, Standard Deviation = 3.4 cm

For which group does a z-score of 1.5 give a taller plant?

• Group A - 45 cm

• Group A - 43.2 cm

• Group B - 43.7 cm

• Group B - 42 cm

Find the z-scores value corresponding if the location is above the mean by 1/2 standard deviations

• -0.50

• +1.00

• +0.50

• -1.00

Find the area under the standard normal curve to the right of z = -2.67.

• 0.0869
• 0.9962
• 0.0008
• 0.1234