Quiz 1 Probability and Statistics

70 college students were asked what their favorite year of high school was. The data collected was compiled into this frequency chart.

Interpret the meaning of the number 17 on the chart.

• The students asked replied they were 17 during their favorite year.

• 17 sophomores were asked what their favorite year was.

• 17 respondents said their favorite year was their sophomore year.

• The average sophomore is 17 years old.

Complete the last cell (highlighted) of the following Relative Frequency chart.

• 29/70 = 0.41429

• 41/70 = 0.58571

• 29/41 = 0.70732

• 19/29 = 0.65517

A class of students was asked how many hours each of them spent on homework this week. The data was used to make this dot plot.

Describe the shape of this distribution.

• Symmetric

• Skewed to the right

• Skewed to the left

• Skewed in the center

The following Histogram shows the number of hours a class of students spend on homework in a given week.

What is the bin (or bucket) size of the histogram?

• 1

• 2

• 4

• 14

The following data shows the number of hours teachers at a high school reported sleeping the previous night.

What does the dot above 8 (circled in red) represent?

• Eight teachers reported sleeping for 1 hour.

• One teacher sleeps at least 8 hours on the weekends.

• At 8 am, one teacher was still sleeping.

• A teacher reported sleeping 8 hours the previous night.

What is a reason you might want to use a histogram instead of a dot plot to display data? (Choose the best response.)

• The histogram allows you to show each individual data value collected rather than displaying data in "bins" like a dot plot.

• The histogram is better when you don't have repeated data values and when the data is spread out with gaps between values.

• The dot plot can be used to display quantitative data, while the histogram is used for quantitative and categorical data.

• Histograms and bar charts are basically the same and so you can convert a histogram into a bar chart.

What is the BEST option for displaying relative frequencies (percents) of categorical data.

• Dot Plot

• Histogram

• Bins

• Pie Chart

Favorite Pizza Topping is an example of...

• An Individual Variable

• A Quantitative Variable

• A Categorical Variable

• A Distribution Variable

What is misleading about this bar graph? (Choose the best answer.)

• The frequencies are unrealistic for Math and Science.

• This type of data would be better displayed in a dot plot.

• The y-axis starts at 100.

• The individual bars are too far apart and should be touching one another.

How many mines contained less than 1.4 mg of uranium?

• 1

• 10

• 14

• 18