document.write( "Question 382710: The scores on a standardized test had mean μ = 2.818 and standard deviation σ= 1.112. A teacher had 69 students take the test. Although the students were obviously not a random sample, she considered her students to be \"typical\" of all the national students. What is the probability that her students achieved an average score of at least 3? \n" ); document.write( "

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The scores on a standardized test had mean μ = 2.818 and standard deviation σ= 1.112. A teacher had 69 students take the test. Although the students were obviously not a random sample, she considered her students to be \"typical\" of all the national students. What is the probability that her students achieved an average score of at least 3?
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\n" ); document.write( "t(3) = (3-2.818)/(1.112/sqrt(69)) = 1.3595
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\n" ); document.write( "P(x-bar > 3) = P(t >=1.350.089295 when df = 68) = 0.0892
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H. \n" ); document.write( "

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