Alg Supp 5.1 Quiz Review

What is the mean and median of the data set below?

{9, 13, 8, 10, 11, 9, 12, 16, 10, 9}

• mean: 10.7

  median: 10

• mean: 10

  median: 10.7

• mean: 11

  median: 10

• mean: 12

  median: 10.7

What is the Q1 and Q3 with the data set below?

{9, 13, 8, 10, 11, 9, 12, 16, 10, 9}

• Q1: 10

  Q3: 12

• Q1: 12

  Q3: 9

• Q1: 9

  Q3: 12

• Q1: 8

  Q3: 16

Mrs. Cox and Mr. Jones are in charge of the work-study program for Oak High School. Each teacher is in charge of supervising 10 students. They are comparing statistics for two groups of students based on the hours worked each week. Which statement is true?

• The mean for Mrs. Cox is greater than the mean for Mr. Jones.

• The median for Mr. Jones is greater than the median for Mrs. Cox.

• The median for Mrs. Cox is greater than the median for Mr. Jones.

• The both have the same mode.

Mr. Daniels was comparing two random samples of students test scores from his Advanced Algebra 1st and 3rd Block classes:

1st Block: Mean= 73.4; Standard Deviation= 6.5

3rd Block: Mean= 67.5; Standard Deviation= 12.4

What can Mr. Daniels most accurately conclude between overall class test scores of 1st and 3rd block?

• The students in both classes performed the same on the test.

• 3rd block's scores had a higher standard deviation, so they performed much better than 1st block

• 3rd block scores are more closely grouped around the average, therefore they had better scores than 1st block

• 1st block students tend to have a slightly better grasp of the material since the mean is higher and dispersion from the mean is less than 3rd block

Mrs. Littleton made a comparison of Geometry quiz scores in her second and fourth block classes:

2nd Block 4th Block

mean............82 82

standard deviation....5.7 8.3

• The average score was lower for 4th block.

• The average score was greater for 4th block.

• There was less variation in scores for 4th block.

• There was greater variation in scores for 4th block.

The box plots show the number of homeruns of a baseball team in different seasons. What could you infer by comparing the range of the data for each season?

• Each season had about 80 homeruns.

• The number of homeruns in season 1 varies more than season 2.

• The number of homeruns in season 2 varies more than season 1.

• The number of homeruns in each season varied about the same.

Here is a data set of miles driven on different road trips.

{192, 220, 183, 204, 195, 190, 182, 189, 231, 228, 241, 173}

What is the interquartile range (IQR) of the data set?

• 38

• 68

• 30.5

• 30

Here is a data set:

{8, 9, 10, 11, 12, 14, 15}

Using the 1.5 IQR Rule, determine if there are any outliers, and if so, how they affect the median.

• 15 is an outlier, and excluding it does not change the mean.

• 8 is an outlier, and excluding it changes the median to 9

• 8 and 15 are both outliers, and excluding them changes the median to 12

• There are no outliers

Here is a data set:

{45, 54, 60, 39, 40, 121}

Using the 1.5 IQR rule, determine if mean is skewed by an outlier.

• Yes, 121 is an outlier, and the mean is skewed to the right

• Yes, 39 is an outlier, and the mean is skewed to the left

• No, there are no outliers, and the mean is not skewed.

• No, 121 and 39 are both outliers, so the mean is not skewed.

For which year is the mean the BEST measure of central tendency?

• 2005

• 2006

• 2007

• 2008