Statistics Algebra Standard Deviation

Which class has the higher test score median? 

• Class #1

• Class # 2 

• The medians are equal

• The median is not shown here. 

The double line plot shows the number of students who attended the home games of the baseball team for two recent seasons. Which of the following statements is NOT true.

• The median attendance for 2009 was less than the median attendance than 2010.

• The attendance for 2010 was more consistent, so the standard deviation would be smaller than the standard deviation for 2009.

• The attendance for 2009 was more consistent, so the standard deviation would be smaller than the standard deviation for 2010.

• The attendance for 2010 ranged from 20-27.

Which data set shows a greater spread (larger IQR)?

• Chess Club

• Checkers Club

• They have the same spread.

• You cannot tell from the box plots.

A distribution whose dot plot or histogram takes the form of a bell with most of the data clustered near the center and fewer points farther from the center

• Bell-Shaped Distribution

• Bimodal Distribution

• Skewed Distribution

• Uniform Distribution

What is the standard deviation for the data given:
{11, 22, 18, 91, 68, 45, 33, 71, 19}

• 26.82

• 28.45

• 809.41

• 719.31

What is the variance for the data given:
5, 10, 7, 12, 0, 20, 15, 22, 8, 2

• 47.47

• 102.01

• 52.77

• 81

What is the variance of the data set?

• 72

• 21.4

• 533.67

• 395.7

Given a normal distribution, what percentage of all values fall within 1 standard deviation from the mean?

• 34%

• 68%

• 95%

• 13.5%

Given a normal distribution, with a mean of 65 an a standard deviation of 8, what percentage of values are within the interval [41,81]?

• 95%

• 99.7%

• 97.5%

• 97.35%

Suppose a data set is distributed normally. The mean is 125 and standard deviation is 7. What data value is 2 standard deviations above the mean?

• 111

• 153

• 139

• 118