Analyzing Data Distributions and Measures

The video tutorial guides students through creating and analyzing a stem and leaf plot, followed by constructing a frequency distribution table. It covers finding the range, median, and mode of a dataset. The tutorial also includes an example of analyzing car speeds using frequency distribution, emphasizing the importance of organizing and interpreting data effectively.

What is the first step in creating a stem-and-leaf plot?

• Count the total number of data points.

• Label the stem and leaf sections.

• Identify the smallest and largest numbers.

• Calculate the mean of the data.

How many numbers should be placed on the stem for a three-digit number?

• Four numbers

• One number

• Three numbers

• Two numbers

What is the range of the data set if the highest number is 151 and the lowest is 111?

• 60

• 30

• 40

• 50

How do you find the median in a data set with an even number of values?

• Average the two middle numbers.

• Choose the lowest number.

• Select the middle number.

• Choose the highest number.

Which numbers appear most frequently in the data set?

• 142, 149, 150

• 111, 118, 123

• 148, 149, 151

• 130, 135, 136

What is the purpose of creating a frequency distribution table?

• To calculate the mean of the data.

• To visualize the distribution of data.

• To find the median of the data.

• To list all data points in order.

How many slides contained between 120 and 149 protozoa?

• 10

• 12

• 15

• 18

What percentage of slides contained fewer than 130 protozoa?

• 40%

• 50%

• 30%

• 20%

What is the mode interval for car speeds between 35 and 40 miles per hour?

• 40 to 45 mph

• 35 to 40 mph

• 30 to 35 mph

• 25 to 30 mph

What percentage of cars drove at a speed less than 40 miles per hour?

• 87.5%

• 62.5%

• 50%

• 75%