Data Analysis Test Review

What do you do if there are two numbers in "the middle" when you are finding the median?

• Pick your favorite number
• Add the two numbers in the middle & then divide by two.
• They are both the median
• None of the above

How many cities have temperatures between 70 degrees and 99 degrees?

• 44
• 34
• 26
• 62

What measure of central tendency (mean, median or mode) would be best for the following set of data?
0, 89, 92, 97, 99, 100

• Mode, because it is the one that shows up the most.
• Median, because there is an outlier.  The outlier could be incorrect and would influence the mean too much.
• Mean, because there is not an outlier.  You should always use the mean.
• There is not a best measure of central tendency for this data.

The mode score on the 7th grade math test was 94.
Which of these interpretations must be correct?

• 99 was the highest score on the test.
• More students received a 94 than any other score
• No student scored below a 50
• A score of 91 was slightly below average.

Measures of central tendency which is greatly affected by extremely low or high scores.

• Mean
• Median
• Mode
• Frequency

Find the median of these numbers:

4,2,7,4,3

• 2

• 5

• 4

• 7

What is the range of these numbers: 4, 5, 1, 3, 8, 11, 9

• 11

• 9

• 10

• 5

The student councel advisor asked every 10th student in the lunch line how they prefer to be contacted with school news.  Will his sample method be more likely to give valid or invalid results?

• Valid
• Invalid
• I don't know

How many total students are in the science class?

• 13
• 6
• 27
• 25

7. A public library asked every 10th person who entered to name the type of book they were getting

• Biased
• Unbiased