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The price-earnings ratios of a sample of stocks have a mean value of 13.5 and a standard deviation of 2. if the ratios have a bell-shaped distribution, what can we say about the poportion of ratios that fall between 9.5 and 17.5?
A) approx 68%
B) approx 95%
C) approx 99.7 %
D approx 75%
E) appox 89%
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In testing equality of two means below, determine the test statistic? (Use the equal variances formula)
Use a 5% significance level to test the claim that there appears to be a difference in the effectiveness of the two diets.
What is the lowest raw score that a client must have on Anxiety Scale A in order to be admitted into this new group? Also assuming some clinics use Anxiety Scale B and often refer their clients to Mary, what is the cutoff point (lowest raw score) ..
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