Sunday

September 21, 2014

September 21, 2014

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

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 - The probability that a certain door is locked is.6. The key to the ...

Probability and Statistics - Sixty percent of a particular model of car are ...

Probability - Statistics show that about 5% of all males are colorblind. Suppose...

Statistics - Find each uniform continuous probability and sketch a graph showing...

Statistics - A manufacturer makes two models of an item: model I, which accounts...

probability - 2.The daily production from a car factory=3 different models-A,B,C...

math - a piano has 88 keys.show with numbers the probability of hitting a ...

Math - A piano has 88 keys. Show with numbers the probability of hitting a ...

Kaplan University - Create a mathematical model for determining the total costs ...

Nautical Studies - IRPCS - Vessel over 100m aground in fog - sound signals. ...