3. The mean performance of all grade six leavers of a school in the NAT is 35. 4. The inventor of a new kind of light bulb claims that all such bulbs last as long as 3000 hours. 5. The average age of...

Formulate a null hypothesis and its alternative hypothesis for each of the following. Write them in words and in symbols.


Extracted text: 3. The mean performance of all grade six leavers of a school in the NAT is 35. 4. The inventor of a new kind of light bulb claims that all such bulbs last as long as 3000 hours. 5. The average age of all the identified stratum of senior citizens in a remote area is 92 years.