Intro to Standard Deviation

This data is normally distributed. What percent of the data is in the shaded region?

• 68%

• 95%

• 99.8%

• 50%

This data is normally distributed. What percent of the data is in the shaded region?

• 68%

• 32%

• 16%

• 50%

This data is normally distributed. What percent of the data is in the shaded region?

• 99.8%

• 0.2%

• 0.15%

• 50%

Between what two standard deviations of a normal distribution lies 68% of the data?

• one below and one above

• two below and two above

• two below and zero

• zero and two above

What does standard deviation represent?

• How many different variations are in the data set.

• How the population varies compared to the sample.

• How spread out each data value is from the mean.

• How often the most popular choices in a sample were picked compared to the least popular choices

List each set of data by color from the lowest standard deviation to the highest standard deviation.

• blue, green, pink, red

• red, pink, green, blue

• pink, green, red, blue

• blue, green, red, pink

What is the symbol used to represent the standard deviation in statistics?

• μ

• x

• σ

• n

What is the standard deviation on this Normal Curve?

• 6

• 12

• 34

• 18

Between what two standard deviations of a normal distribution lies 95% of the data?

• one below and one above

• two below and two above

• two below and zero

• zero and two above

In a factory, the weight of the concrete poured into a mold by a machine follows a normal distribution with a mean of 1150 pounds and a standard deviation of 22 pounds. Approximately 95% of molds filled by this machine will hold weights in what interval?

• 1084 to 1216 pounds 

• 1106 to 1150 pounds 

• 1106 to 1194 pounds 

• 1128 to 1172 pounds