Question

Need HELP!! Suppose you work at a fast-food restaurant and the manager asks you to record how many people come inside the restaurant during each hour between the hours of 10:00 a.m. and 8:00 p.m. The results are shown in the table below. Describe how to create a dot plot using the data in the table below.
Time                       Number of People
10 am - 11 am             20
11 am - 12 pm             21
12 pm - 1 pm              19
1 pm - 2 pm                21
2 pm - 3 pm               23
3 pm - 4 pm              19
4 pm - 5 pm              24
5 pm - 6 pm              23
6 pm - 7 pm              20
7 pm - 8 pm              23

Answer 1

A dot plot is a frequency graph just like a histogram. A frequency of the graph shows how many points are included in a certain data interval. But instead of using bars, in the dot plot, you stack dots above the respective number on the number line. The first thing to do is create a number line according to the data information given. In this case, the numbers are written as intervals. Next, you place the exact number of dots representing the number of people. If there were 20 people who entered between 10 am to 11 am, you place 20 dots stacked on top of each other over the 10-11 interval on the number line.

The resulting dot plot is shown in the attached picture. You can observe that there is no clear trend among the data. They are actually fluctuating with the highest number of people between 4-5 pm and the lowest number between 12-1 and 3-4 pm.