EMILIO AGUINALDO COLLEGE
Gov. D. Mangubat Ave., Brgy. Burol Main, City of Dasmariรฑas, Cavite 4114, Philippines
Tel. Nos. (046) 416-4341-42 www.eac.edu.ph
STATISTICS AND PROBABILITY
WORKSHEET #4
NAME:
SECTION:
I. HYPOTHESIS: Give the symbolic form of null and alternative hypothesis for each
statement. State what type of testy should be used for hypothesis testing. (4 pts. each)
1. A professor believes that a certain studying technique will influence the mean
score that her students receive on a certain exam, but sheโs unsure if it will
increase or decrease the mean score, which is currently 82.
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๐ฏ๐๐ท๐ถ๐ป๐ฏ๐ฌ๐บ๐ฐ๐บ ๐ป๐ฌ๐บ๐ป:
2. We want to test if college students take less than five years to graduate from
college, on the average.
๐ฏ๐:
๐ฏ๐:
๐ฏ๐๐ท๐ถ๐ป๐ฏ๐ฌ๐บ๐ฐ๐บ ๐ป๐ฌ๐บ๐ป:
3. We want to test whether the mean height of eighth graders is 66 inches.
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๐ฏ๐๐ท๐ถ๐ป๐ฏ๐ฌ๐บ๐ฐ๐บ ๐ป๐ฌ๐บ๐ป:
4. In an issue of U. S. News and World Report, an article on school standards stated
that about half of all students in France, Germany, and Israel take advanced
placement exams and a third pass. The same article stated that 6.6% of U.S.
students take advanced placement exams and 4.4% pass. Test if the percentage of
U.S. students who take advanced placement exams is more than 6.6%.
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๐ฏ๐๐ท๐ถ๐ป๐ฏ๐ฌ๐บ๐ฐ๐บ ๐ป๐ฌ๐บ๐ป:
5. Suppose a standard fertilizer has been shown to cause a species of plants to grow
by an average of 10 inches. However, one botanist believes a new fertilizer causes
this species of plants to grow by an average amount different than 10 inches.
๐ฏ๐:
๐ฏ๐:
๐ฏ๐๐ท๐ถ๐ป๐ฏ๐ฌ๐บ๐ฐ๐บ ๐ป๐ฌ๐บ๐ป: