How do I find the null and the hypothesis?
Thursday, August 27, 2009 16:39 | Filled in Homework Help
mathretarded asked:
In an article appearing in Today’s Health a writer states that the average number of calories in a serving of popcorn is 75. To determine if the average number of calories in a serving of popcorn is different from 75, a nutritionist selected a random sample of 20 servings of popcorn and computed the sample mean number of calories per serving to be 78 with a sample standard deviation of 7.
In an article appearing in Today’s Health a writer states that the average number of calories in a serving of popcorn is 75. To determine if the average number of calories in a serving of popcorn is different from 75, a nutritionist selected a random sample of 20 servings of popcorn and computed the sample mean number of calories per serving to be 78 with a sample standard deviation of 7.
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Japal says:
August 30th, 2009 at 6:29 am
The Null Hypothesis is that the number of calories in a serving of popcorn = 75
The Alternative Hypothesis is that the number of calories in a serving of popcorn ≠ 75
(The keywords for this one was that the number of calories per serving is DIFFERENT- thats why there’s the ≠ and not a < or > sign)
Cheers!
Kishmeer N T says:
September 2nd, 2009 at 2:37 am
The Null Hyp Ho always has an equal sign. The Alternative Hyp Ha never has an equal sign.
Start by looking for a word that implies direction, >(greater than),< (less than) or ≠ (could be greater or could be less)
If the problem had nutritionist wanted to determine if calories >75, or 75 then Ho would be the opposite which is mean