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State the Null and alternate hypothesis for the given problem

For each part state the null (Ho) and alternative (HA) hypotheses.
a. Has an average community level of suspended particles for the month of August exceeded 30u/m3?
b. Does mean age of onset of a certain acute disease for school children differs from 11.5?
c. A Psychologist claim that the average IQ of a sample of 60 children is significantly above the normal IQ of 100.
d. Is the average cross-sectional area of the lumen of coronary arteries for men, age's 40-59, less than 31.5 percent of the total arterial cross section?
e. Is the mean hemoglobin level of a group of high altitude workers different from 16g/ml?
f. Does the average speed of 50 cars as checked by radar on a particular highway differ from 55mph?

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