Help with sentence

1. Technically "data" is plural so "is" should be "are".
2. The addition of "enough" after "adequate" is a useful emphatic option.

As for "right or wrong" this always depends on context. The sentence, as it stands, may be perfectly acceptable when spoken, but not when written.

I'd suggest:

"The marketing data is not adequate to draw conclusions."

I see "data" as a collective noun.

Fres I'd disagree, seems redundant, but can't defend my stand

...is not sufficient to draw a conclusion. Better,
...is not sufficient to enable a conclusion to be drawn.

I'm happy to regard data as singular.

There's nothing wrong with that sentence.

You think?

A, I like your correction best. T.

Mac how about

...is not sufficient to enable a conclusion.

I know. That it is not phrased as you would phrase it is not evidence that it is wrong. It is not wrong. I have worked with ESL students before. They don't want you to write their sentences for them, they want ot compose their own sentences, and then to know if those sentences are grammatically correct. This sentence is grammatically correct. Not only that, but if one had encountered it from a native speaker of English, one would not for a moment consider it wrong.

By the way, i see this here all the time. An ESL student comes here to ask if a sentence is correct. Many--i'd say most--of those who respond never answer that question, they just start providing their putatively superior phrasing. If someone writes a sentence which is grammatically correct, but sounds awkward, there is nothing wrong with saying that. But if someone writes a sentence which is not incorrect, and is aking if it is correct, then it is wrong to ignore the question and to just start offering alternatives which represent the preferences of those responding. This sentence is not only correct, if offered by a native speaker, people not even bat an eye. It's not just a correct sentence, it's a good one.

What's your problem? We're just trying to help the ESL student with alternatives that would help improve his/her English. Let them tell us that's not what they're seeking. But, you? Give me a fuc'g break!

Here's your f*cking break, you perrenial idiot. None of the suggestions offered represented an improvement over the original sentence. How often have you tutored ESL students? As usual, you shoot your mouth off without a clue.

That's what you say, but that doesn't matter one iota.

Given how often you completely screw up the English language when you post, you really have a gall to criticize anyone else. Your English sucks. There was nothing wrong with that sentence, and none of the suggestions offered represented an improvement--they just represented preferences.

Setanta: "This sentence is grammatically correct."

It plainly is not. It contains at least two grammatical errors. Although I grant you, its meaning is clear and without ambiguity. But grammatically correct it is not.

"Adequate enough", and I thought I was the resident tautological comedian.

The illiterate "perrenial idiot" is a perennial problem.

My remarks on "emphatic option" and "context" said it all.

The "question" has now moved on and is embedded in new superficial contexts beyond its original location.

(Ref: Derrida. "All is (con)text")

As is often the case, Setanta is correct.

I'd prefer:

The marketing data is insufficient for statistical inference.

But you'd need to know about inference and sufficient statistics.