Each participant has 5 scores in 5 different items. The score in each question is either 1 (correct response) or 0 (incorrect response). Basically would be something like this:

P1 P2 P3 P4

1 1 1 1

1 1 1 0

1 1 0 0

1 0 0 0

0 0 0 0

What does these numbers represent? I can only see 4 columns. Is that 4 answers? Or is that 4 participants that has one row for each answer?

(In statistics it is more common to have each respondent=observation as one row and each column for each question.)

What I want to explore is whether each participant mean score is bigger than 0.75 (Which would mean a good performance in the task). What can I do?

For 5 questions I can imagine this number of correct answers: 0, 1, 2, 3, 4, 5.

The proportion correct answers would be: 0, 0.20, 0.40, 0.60, 0.80, 1.00.

Why ask for proportion larger than 0.75?

Do theses questions differ in difficulty? So that question 1 only 10% would answer correct, while in question 5 maybe 70 could be correct?

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Or is it that simple, to just count the number of correct answers an note that participant 1 has got 4 of 5 questions correct, thus 80%, and thus been "good"?