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Questions and Answers
What is the purpose of calculating percentiles?
Why is random sampling from a normally distributed population likely to result in a normally distributed sample?
What is the significance of z-scores in calculating percentiles?
How does the rarity of a bean color change as we move further from the mean?
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Which color bean has the highest percentile ranking?
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What allows us to calculate percentiles in a distribution?
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What does within subjects variance measure?
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Which of the following is true about within group variance?
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What is the most commonly reported measure of within group variance?
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Between subjects variance refers to the variance between:
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What does between subjects variance measure?
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What is the formula to convert a z score to a t score?
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In statistical terms, what does between subjects variance NOT refer to?
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Which score has a mean of 50 and a standard deviation of 10?
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What does a T score of 70 indicate?
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In z scores, what does a mean of 0 indicate?
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Why are T scores easier to explain compared to z scores?
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How can we use multiple z scores on psychologically meaningful measures from the same person?
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What type of error occurs when the null hypothesis is actually true but is rejected?
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When does a type II error occur?
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What does statistical significance indicate about group differences?
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Which error occurs when a statistically significant finding has little practical importance?
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What is the main reason for discrepancies between statistical and practical significance?
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Which statistic can quantify the practical significance of a finding?
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What is the Pearson product-moment correlation coefficient 'r' commonly used for?
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What does a z score help determine in psychometric tests?
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Why can inferential statistics never prove that observed differences are not due to chance?
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What is one of the key limitations mentioned regarding statistical tests like the t-test and correlation coefficient?
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What characteristic is common between naturally occurring phenomena like IQ and heights, and statistical test results like 'r' correlation coefficient?
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What factor contributes to providing stronger support for the validity of a study?
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