Monday
July 28, 2014

Homework Help: statistics/ Help!-thanks!

Posted by StudentD on Saturday, August 25, 2012 at 4:28pm.

The producers of a new toothpaste claim that it prevents more cavities than other brands of toothpaste. A random sample of 60 people use the new toothpaste for 6 months. The mean number of cavities at their next check up is 1.5. In the general population the mean # of cavities after a 6 month check up is 1.73 (@= 1.12).
a) is it 1 or 2 tailed test? (I think one- tailed)
b) What are the Ho and Ha for this study? I think:
Ho: = 1 or cavities from new toothpaste= cavities any other brand toothpaste
Ho: 0>1 or cavities from new toothpaste> cavities with any other brand toothpaste
Ha: 0<1 or cavities from new toothpaste< cavities with any other brand toothpaste

c) Compute Zobt -I don't know how
d) What is Z cv?- Also don't know.
e) Should Ho be rejected (I think yes)
f) Determine the 95% confidence interval for the population mean, based on the sample mean.

Thank you in advance for your help!

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

marketing - Binomial probability distributions are used in business, science, ...
Stats - 5. The board of directors for Procter and Gamble is concerned that only ...
Calculus - it is assumed that the toothpaste market is perfectly competitive and...
Economics - It is assumed that the toothpaste market is perfectly competitive ...
arithmetic sequences - a tube containing 3 ounces of toothpaste is being used at...
Math - 1.) Solve the system by graphing. You may use paper or a calculator. 2x...
Math Help! - 1.) Solve the system by graphing. You may use paper or a calculator...
science - I have an experiment to do with active transport and osmosis with an ...
business - A production run of toothpaste requires a fixed cost of $100,000. The...
geometry - A drug company is testing new toothpaste in 2 flavors, regular and ...

Search
Members