SOLUTION: A dietitian read in a survey that at least 55% of adults do not eat breakfast at least 3 days a week. To verify this, she selected a random sample of 80 adults and asked them how m

Question 748124: A dietitian read in a survey that at least 55% of adults do not eat breakfast at least 3 days a week. To verify this, she selected a random sample of 80 adults and asked them how many days a week they skipped breakfast. A total of 50% responded that they skipped breakfast at least 3 days a week. At a=0.01, test the claim
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
A dietitian read in a survey that at least 55% of adults do not eat breakfast at least 3 days a week. To verify this, she selected a random sample of 80 adults and asked them how many days a week they skipped breakfast. A total of 50% responded that they skipped breakfast at least 3 days a week. At a=0.01, test the claim
-----------------------------
Ho: p <= 0.55
Ha: p < 0.55 (claim)
-----
z(0.50) = (0.50-0.55)/sqrt[0.55*0.45/80] = -0.8989
--------------
P-value = P(z < -0.8989) = normalcdf(-100,-8989) = 0.1844
-----
Since the p-value is greater than 1%, fail to reject Ho.
The test results do not support the claim.
Cheers,
Stan H.
================
RELATED QUESTIONS
11. Breakfast Survey A dietitian read in a survey that at least 55% of adults do not eat... (answered by Boreal)

A dietician read in a survey that 68.9% of adults in the U.S. do not eat breakfast at... (answered by Boreal)

Can someone kindly tell me if my answer is correct? Thank you. A research center... (answered by stanbon)

Suppose in fact 60% of all Filipino adults between the ages of 30 and 39 exercises at... (answered by Theo)

Suppose in fact 60% of all Filipino adults between the ages of 30 and 39 exercises at... (answered by Boreal)

a recent survey determined that 7 out of 9 students eat school lunch at least once a... (answered by ewatrrr)

You have a budget of 60 $ to spend on your family of 5 (two adults and three growing kids (answered by ikleyn,Alan3354)

Three newspapers A, B and C are published in a certain city. It is estimated from a... (answered by ikleyn)

In a survey of 3005 adults, it was found that 81% used at least one prescription... (answered by Boreal)