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What is the null hypothesis?
A CEO claims that at least 80 percent of the company's 1,000,000 customers are very satisfied. Again, 100 customers are surveyed using simple random sampling. The result: 73 percent are very satisfied. Based on these results, should we accept or reject the CEO's hypothesis? Assume a significance level of 0.05.
ok, I know the procedure for this but what is the null hypothesis here?
Is it P >= 0.80?
coz that's what it says on this website (http://stattrek.com/Lesson5/Proportion.aspx?Tutori...
ok now I've got another question from a textbook:
A manager claims that over 60% of a mall's visitors shop at the store. Let p be the proportion.
Then the null hypothesis is that p=0.6.
So in the first case, the claim is the NULL hypothesis, while in the second the claim is the ALTERNATIVE hypothesis. What am I not getting here? Or has the website got it wrong?
1 Answer
- πguyLv 41 decade agoFavorite Answer
I think you have it about right. In the first case, I would say the null hypothesis is P=.8 and the alternative is P<.8.
In the second case, I'd say the null is P=.6
You can state a null hypothesis in the form P>=.8, but you really only test to see if the observed value is different from .8, not the possible proportions greater than that. The ">" sign confuses that.
