Stats review for final

Which of the following is the best estimate of the standard deviation of the distribution in the figure?

• 18

• 9

• 54

• 97

• 106

The graph shows the distribution of scores of 30 students on a mathematics test. Based on the histogram, which statement must be true?

• The lowest test score is 41%.

• The highest test score is 100%.

• The mean test score is between 81% and 90%.

• The median test score is not greater than 80%.

• The lower quartile of the test scores is greater than 60%.

Use the table to answer the following question. Of the male subjects in the study, what fraction drive a sports car?

• 39/84

• 39/240

• 39/60

• 60/240

• 84/240

What type of correlation describes the following sentence:
The temperature outside and the number of hot chocolate sold at a football game.

• postive
• negative 
• no

The scatter plot below shows the number of books read by students in Mrs. Murray’s English class and their final grades. Which statement represents the best description about the line of best fit?

• The more books students read, the lower their English grade.

• The more books students read, the higher their English grade.

• The fewer books students read, the higher their English grade.

• No relationship exists between the number of books students read and their English grades.

Given a normal distribution, what percent of the data should fall within one standard deviation of the mean?

• 34
• 68
• 16
• 13.5

Find the median of the data:  
87,  88,  88,  90, 92,  93,  95,  96,  98

• 90
• 92
• 88
• 89

Given a normal distribution, what percent of the data should fall within three standard deviations of the mean?

• .15
• 68
• 95
• 99.7

About 50 % of the data values are greater than what value?

• 12
• 15
• 22
• 31

What is the interquartile range for box-and-whisker plot shown?

• 18

• 4

• 15

• 11