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17 Cards in this Set
- Front
- Back
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Approximately what percentage of scores will fall between -3 and +3 standard deviations in a normal distribution?
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99.74% |
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What are the percentage of scores that you will need to know for percent of scores questions?
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0.15% 2.35 % 13.5% 34% 34% 13.5% 2.35% 0.15% |
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The z score for the mean is
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0 |
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On a standardized test, the mean is 83 and the standard deviation is 3.5. What is the best approximation of the percentage of scores is 15. If a score in the distribution is equal to 75, then the z score is?
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-1.0 |
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A test was given to 120 students, and the scores approximated a normal distribution. If the mean score was 72 with a standard deviation of 7, approximately what percent of the scores were 65 or higher?
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84% |
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On a standardized test, Cathy had a score of 74, which was exactly 1 standard deviation below the mean. If the standard deviation for the test is 6, what is the mean score for the test? |
80 |
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One-tailed alternatives are phrased in terms of |
< or > |
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The form of the alternative hypothesis can be |
one or two-tailed
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The value set for a is known as
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the significance level |
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Smaller p-values indicate more evidence in support of
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the alternative hypothesis
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In the context of confidence intervals, what does 99% confident mean?
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If we repeat this experiment many times and calculate 99% confidence interval each time, 99% of these confidence intervals will contain the true treatment effect.
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A politician claims that a larger proportion of members of the media are Democrats when compared to the general public. Let p1 represent the proportion of the news media that is Democrat and p2 represent the proportion of the public that are not Democrat.
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Ho: p1 -p2=0, Ha: p1-p2 > 0 |
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The popular skittles candy comes in 5 colors. According to the skittles website, the colors are evenly distributed in the population of Skittle candies. So each color makes up 20% of the population. Which sequence sample is most likely? |
0, 0.075, -0.125, 0.1, -0.05 |
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As the test statistic becomes larger, the p-value
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gets smaller |
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An assumption made about the value of a population parameter is called a |
hypothesis |
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a p-value |
is a probability |
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if a hypothesis is not rejected at the 5% level of significance it |
will never be rejected at the 1% level |
