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Researchers Sync and Smith reported a significant correlation between children's reading level and intelligence measured as an IQ score (r=.23). The same researches reported that the correlation between math ability and knowledge of social studies was not significant (r=.15). Explain these results as if you were writing to a person who has never had a course in statistics.
Be sure to discuss
a. significance,
b. the direction and strength of the relationship,
c. causality, and
r2 where applicable.
What is the minimum sample size needed if the total width of the confidence interval must be less than 5 percentage points?
A student scores 81 on a chemistry test and 75 on a history test. For the chemistry test, the mean was 70 and the standard deviation was 20. For the history test, the mean was 65 and the standard deviation was 8.
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