Cycle 4: Sections 5, 7 & 8 REVIEW

Multiple Choice

What is the median?

• biggest- smallest
• average
• the middle #
• # that happens the most

Multiple Choice

What is the mean?

• # happening the most
• the number in the middle
• biggest-smallest
• the average

Multiple Choice

The mode is the number ________________________.

• you see most

• you see least

• you don't see

• you see first

Definitions

• Mean, Median and Mode are measures of a data set.

• Measure of Variation: DESCRIBES how the data in a data set are spread out.

• Standard Deviation and Variance are measures that show how much data values deviate from the mean.

  • Find the difference of each value from the mean

  • Square that value

  • Find the mean (average) of the squared values

  • The square root of the above mean is the standard deviation.

Multiple Choice

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

• 6.89
• 10.1
• 7.26
• 9

Multiple Choice

A data set has a mean of 290 and a standard deviation of 20. Calculate the z-score for 265.

• $$z=250.5$$

• $$z=1.25$$

• $$z=-1.02$$

• $$z=-1.25$$

Multiple Choice

A data set has a mean of 300 and a standard deviation of 40. What value would have a z-score of $$z=-2$$  ?

• 298

• 296

• 220

• 380

Multiple Choice

What does it mean to have a z-score of $$z=0$$  on a quiz?

• It means you did better than zero people.

• It means you scored the same grade as the average grade.

• It means you earned a zero on the quiz.

• It means the average score was a zero.

Multiple Choice

Find the Z-score.

Mean = 22

Standard Deviation: 3.1

x = 29

• 2.26

• 16.45

• -2.26

• 1.26

Multiple Choice

Find the Z-score.

Mean = 22

Standard Deviation: 3.1

x = 41

Would this be an outlier?

• Yes; z-score GREATER than 2

• No; z-score falls on normal curve

Multiple Choice

Adam's Z-score on a test is +2.50. What does this mean?

• Adam's score has a 2.5% chance of being better than any other randomly selected score.

• Adam's test score was better than 25% of his peers.

• He scored 2.5 standard deviations above the average.

• He did terrible.

Multiple Choice

Given y varies directly as x, and y = 39 when x = 3. 
Find the value of y when x = 2.

• 26
• 3
• 58.5
• 2

Multiple Choice

The value of y varies directly with x.  Which function represents the relationship between x and y if y = 14 when x = 6. 

• y=20x
• y=84x
• y=7/3x
• y=3/7x

Multiple Choice

Is the given table a direct variation? If so, what is the constant (k)?

• Yes; 1/4
• Yes; 4
• Yes; 1/2
• No

Multiple Choice

Is the given table a direct variation? If so, what is the constant (k)?

• Yes; 8
• Yes; 16
• Yes; 24
• No

Multiple Choice

Which of the given graphs is a direct variation?

• A
• B
• C
• D

Multiple Choice

True or False:
An inverse variation is always a curve and a direct variation is always a line?

• True
• False

Multiple Choice

Is the given table a direct variation? If so, what is the constant of variation?

• Yes; 1/3
• Yes; 3
• Yes; 5
• No

Multiple Choice

Direct or Inverse Variation?

• Direct Variation

• Inverse Variation

Multiple Choice

Choose the Inverse variation equation

• $$y=22x$$

• $$y=\frac{14}{x}$$

• $$y=5^x$$

• $$y=30-2x$$

Multiple Choice

Choose the Direct variation equation

• $$y=22x$$

• $$y=\frac{14}{x}$$

• $$y=5^x$$

• $$y=30-2x$$

Multiple Choice

Choose the Inverse variation graph

Math Response

y varies inversely with x, and

x=6 when y=7

Find the constant (k).

Type answer here

Correct Answer: 42

Deg^°

Rad

Multiple Choice

Given that y varies inversely with x, and x =7 when y = 4, what is y when x = 2?

• 14
• 10
• 2
• -14

Drag and Drop

In this type of variation, x and y are doing the opposite- when one is increasing, the other is decreasing

Placeholder

Drag these tiles and drop them in the correct blank above

inverse

direct

neither