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stats ch 18-20 vocab (1)
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stats ch 18-20 vocabstandard error - CORRECT ANSWER-the estimated standard deviation of a
sampling distribution using statistics found from the data
confidence interval - CORRECT ANSWER-estimate +/- margin of error
C% of all random samples will yield intervals that contain the true parameter value
one-proportion z-interval - CORRECT ANSWER-a confidence interval for the true
value of a proportion
p +/- z* SE(p)
margin of error - CORRECT ANSWER-the extent of the interval in either side of the
observed statistic value; a small margin of error = less confidence, large margin of
error = more confidence
critical value - CORRECT ANSWER-the number of standard errors to move away
from the mean of the sampling distribution to correspond to the specified level of
confidence
alternative hypothesis - CORRECT ANSWER-proposes what we should conclude if
we reject the null hypothesis
null hypothesis - CORRECT ANSWER-the claim begin assessed in a hypothesis
test; usually "no change", "no effect", "no difference"
one-sided alternative - CORRECT ANSWER-when we are interested in deviations in
only one direction away from the hypothesized parameter value
two-sided alternative - CORRECT ANSWER-when we are interested in deviations in
wither directions away from the hypothesized parameter value
p-value - CORRECT ANSWER-probability of observing the hypothesized value for
more extreme if the null hypothesis is true
statistically significant - CORRECT ANSWER-when the p-value falls below the alpha
level, we say that the test is "statistically significant" at that alpha level
alpha level - CORRECT ANSWER-level that determines when we reject a null
hypothesis
significance level - CORRECT ANSWER-equal to the alpha level; can be said as
"significant at the 5% significant level"
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