Determine if one-tailed test or two-tailed test fits the given alternative hypothesis. 1. The mean height of Grade 12 students is less than 66 inches. 2. The standard deviation of their height is not equal to 5 inches. 3. Male Grade 7 and Grade 12 students differ in height on average. 4. The proportion of senior male students’ height is significantly higher than that of senior female students. 5. The average grade of Grade 11 students in Statistics is lower than their average grade in Calculus. 6. The newly found vaccine reduces the risks of viral infections of the patience. 7. The enrolment in elementary schools is not the same as the enrolment in the secondary schools. 8. Male adolescents have higher intelligence quotient level than the female adolescents. 9. The average number of internet users this year is significantly higher as compared last year. 10. Paracetamol and Ibuprofen have the same rate of time to reduce the headache of the patients.

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