Posted by **Kate** on Tuesday, January 26, 2010 at 7:55pm.

I don't mind you showing me the caluclator key strokes to do this

or show me the mathematical way whice ever thanks

Here is a simple probability model for multiple-choice tests. Suppose that a student has probability p of correclty ansering a question chosen at random form a univers of possible questions. (A strong student has a higher p than a weak student.) The correctness of an anser to any specific question doesn't depend on other quetions. a test contains n questions. Then the proportion of correct ansers that a student gives in a sample proportion p hat form an SRS of size n dranw from a population with population proportion p.

(a) Julie is a good student for whom p = .75. Find the probabilty that Julie socres 70% or lower on a 100-question test.

here what the back of the book says

P(p hat less than or equal to .50) = P(Z less than or equal to -1.155) = .1241

## Answer this Question

## Related Questions

- Statistics - Suppose a multiple-choice test has 10 questions each with 5 ...
- Math - What is the probability of rolling a number cube and getting an even ...
- advanced statistics - suppose a student takes a multiple choice test with 10 ...
- Writing Tests - Lately, for the past couple of tests I've written, I suddenly ...
- math probability - this is a probability question... Suppose you are asked to ...
- Probability - Statistics show that about 5% of all males are colorblind. Suppose...
- Statistics - On a very short quiz, there is one multiple choice question with 5 ...
- statistics - A multiple-choice test consists of 29 questions with possible ...
- Math - Each day Julia's math Teacher gives class a warm up qs. It's true/false ...
- Math - a 10 question multiple choice test has 4 possible answer for each ...

More Related Questions