Mean and one standard deviation
Using the approximations for normal curves, what percentage of scores fall between the mean and one standard deviation below the mean?
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In a poll of 600 randomly selected subjects, 240 answered "yes" when asked if they planned to vote in a state election. Construct a 95% confidence interval estimate of the proportion of all who plan to vote in that election.
What is the probability of randomly sampling a set of 5 people out of this population who have a man IQ of 120 or greater?
What are the two critical values for a two-tailed test with a 0.01 level of significance when n is large and the population standard deviation is known?
At "alpha" = 0.05, is there enough evidence to conclude that, on average, these lakes are nonacidic?
Construct a 90% confidence interval estimate of the percentage of all adults who have the belief. Write a statement interpreting the confidence interval.
Suppose that the mean score on a creativity test is 20 and the standard deviation is 5. You are told that the distribution is normal. Using the approximations for normal curves, how many people would get a score between 15 and 25?
To test this hypothesis you ask a random sample of 200 graduates and 21% agree with that a degree is not worth the cost. At "alpha" = 0.10, is there enough evidence to reject the claim?
What distinguishes raw scores from difference scores besides the fact that difference scores are used in t-statistic for repeated-measures research design?
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