Exercise 1 A city's telephone book lists 280,000 people. If the telephone book is the frame for a study, how large would the sample size be if systematic sampling were done on every 100th person?...

A city's telephone book lists 280,000 people. If the telephone book is the frame for a study, how large would the sample size be if systematic sampling were done on every 100th person?

Sample size =

A random sample of size 81 is drawn from a population with a standard deviation of 14. If only 18% of the time a sample mean greater than 300 is obtained, what is the mean of the population?

Round the answer to 2 decimal places.

In a particular area of Tasmania, an estimated 75% of the homes use heating oil as the principal heating fuel during the winter. A random telephone survey of 150 homes is taken in an attempt to determine whether this figure is correct. Suppose 120 of the 150 homes surveyed use heating oil as the principal heating fuel. What is the probability of getting a sample proportion this large or larger if the population estimate is true?

Round all
z
values to 2 decimal places. Round all intermediate calculations and answer to 4 decimal places.

P(x)
=

The tolerance is +/- 0.0001

QUESTION 4

For a population,
N
= 23000 and
p
= 0.18 . Find the
z
value for for
n
= 70 .