For Ronny's weather project, the most appropriate label to use for the vertical scale of the bar graph is the amount of rain. Here option D is correct.
The vertical scale of a bar graph typically represents the quantitative variable being measured or observed. In Ronny's case, he is recording whether or not it rains each day during a one-month period.
The amount of rain is a quantitative variable that can be measured in terms of inches or millimeters. Using this variable on the vertical scale allows Ronny to visually depict the variation in rainfall throughout the month, providing a clear representation of the weather patterns.
This choice allows viewers of the graph to easily interpret the data, compare different days, and identify trends or patterns in the amount of rainfall over the given time period. Using the amount of rain as the vertical scale ensures that the graph accurately reflects the nature of Ronny's weather study. Here option D is correct.
Complete question:
For his weather project, Ronny will record whether or not it rains each day during a one-month period. Ronny plans to display the results of his study on a bar graph. Which is the most appropriate label to use for the vertical scale?
A - the number of days
B - the time of day
C - the day of the week
D - the amount of rain