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10. in 2009, roughly of people age 12 or older who did not drink alcohol were current users of illegal drugs. a. 4% b. 10% c. 13% d. 20%

Summarize the work of nobel prize winner roger sperry that is discussed in this article. (site 1)

The difference of sample means of two populations is 55.4, and the standard deviation of the difference of sample means is 28.1. which statement is true if we are testing the null hypothesis at the 95% confidence level? a. the difference of the two means is significant, so the null hypothesis must be rejected. b. the difference of the two means is significant, so the null hypothesis must be accepted. c. the difference of the two means is not significant, so the null hypothesis must be rejected. d. the difference of the two means is not significant, so the null hypothesis must be accepted.