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An educational researcher is interested in comparing the reading skills of children in three schoos systems. Inner City, Suburban, and Rural. A random sample of 4 children from each system provided the following reading scores:
Inner City--79-84-74-93Suburban--90-84-87-95Rural--79-73-67-78
Assume the samples comes from normal populations with equal variances.
At the 5% significance level, can the researcher reject the hypothesis that the mean reading scores of all children in the three school systems is the same? Formulate and test the appropriate hypotheses. Use the critical value approach.
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Determine the following areas under standard Normal distribution curve.
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Using a 0.01 level of significance, test the claim that the tutoring has an effect on the math scores.
Assume that the readings on the thermometers are normally distributed with a mean of 0 degrees and a standard deviation of 1 degrees C.
What is the predicted blood pressure for an average 17 year old as estimated from the regression line? And the standard error of the estimate for a 17year old ?
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