Asking “How many analysis have you read?” is wrong because the word “analysis” refers to only one study. Thus, you have to use the plural form of the word, which is “analyses.”

Is analysis a plural?

Analysis is singular. ... Analyses is the plural form of analysis, which means there are more than one. In other words, there are several analyses. Both words have an “s-e” in them.

Is Analyst singular or plural?

The plural form of analyst; more than one (kind of) analyst.