Friday
April 18, 2014

Homework Help: college

Posted by Allan on Sunday, March 14, 2010 at 9:31am.

The diameter of a wire should be 8 cm. It follows a normal distribution and has a standard deviation of 0.01 cm.
A person tests each delivery by taking 5 samples, accepting the goods only if the mean is at most 8.01

a)
Find the probability of type 1 error?

b)
A hypothesis test is to be carried out with P(type I error) = P(type II error) and either one being at 0.1%.
What is the necessary sample size for this test? (answer in my book says it's n=17)

2)
A company will sell a new product if the proportion of customers that will buy it is at least 20%. It is decided that the null hypothesis is rejected if the sample proportion is at least 27%. Sample size = 100.
a) Find P(type I error)

b)
If P(do not reject the null hypothesis)must be at least 99% if the true proportion is 0.17 and
P(reject the null hypothesis)must be at least 99% if the true proportion is 0.27:
which sample size is required?
(My book's answer is n = or greater than 365)

I don't understand how to solve these kind of questions, I'd greatly appreciate if you could help explain !

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

MATH - Which of the following normal distributions has the smallest spread? A. A...
Physics - You need to make a 100 microH inductor on a cylinder that is 5.0 cm ...
physics - 1. Two identical 15.0 kg balls, each 25.0 cm in diameter, are ...
statistics - An SRS of size n is taken from a large population whose ...
math - the lengths of the sides of four triangles are listed as follows. which ...
math - Suppose that people's heights (in centimeters) are normally distributed, ...
Statistics - The t distribution should be used when ___. the sampling population...
Math - I have a problem on standard deviation, and I will need some help with it...
Math (Statistic) - Considered the sampling distribution of a sample mean ...
Physics - 1) Suppose that you wish to fabricate a uniform wire out of 1.15 g of ...

Search
Members