Histograms and Shapes of Distribution

Observe the histogram and choose the frequency distribution that corresponds to it.

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• 

The following data set shows the minutes spent on internet by 50 internet users. Use seven classes to construct a frequency distribution. What's the class width?

• 11

• 12

• 7

• 86

Which of the following statements corresponds to a frequency distribution?

• a table that shows the number of times a data entry appears in a data set.

• a data set that shows the number of data entries that appear in a time.

• a conclusion drawn from a sample.

• the boundaries between two consecutive bars.

How many classes are there?

• 6

• 30

• 1-5

• 1-30

What is the midpoint of the first class?

• 4

• 5

• 1

• 3

What is the class boundary between the second and third class?

• 10

• 11

• 10.5

• 6

Observe the frequency distribution:

Estimate the class width.

• 11

• 10

• 25

• 19.5

Observe the frequency distribution:

Estimate the relative frequency of the fourth class.

• 69

• 5.3

• 0.189 or 18.9%

• 0.54 or 54%

It is useful to describe the shape of data. It can be symmetrical or have a positive or negative skew. Data with a positive skew has a long tail in the positive direction of the horizontal axis. Data with a negative skew has....

• a long tail in the direction of the negative horizontal access

• a long tail in the direction of the positive horizontal access

Is this data positively or negatively skewed?

• Positively skewed

• Negatively skewed