Question

1. what is indicated by a graph that shows a sudden spike upward at a certain point in time and then returns to its previous level?

a. a temporary increase in the measured quantity followed by a return to normal
b. a periodic pattern repeating every hour
c. a constant relationship with no events
d. a continuous upward trend that never stops

Explanation:

To solve this, we analyze each option:

• Option a: A sudden spike upward then return to previous level means a temporary increase (the spike) followed by going back to normal (previous level). This matches the graph description.
• Option b: A periodic pattern repeating every hour would show regular, repeated spikes, not a single spike and return. Eliminate.
• Option c: A constant relationship with no events would be a flat line, no spike. Eliminate.
• Option d: A continuous upward trend that never stops would show a line increasing over time, not a spike and return. Eliminate.

Answer:

a. A temporary increase in the measured quantity followed by a return to normal