Bethany purchased gasoline at four different gas stations. The table shows the total cost of the gasoline she
2 answers:
You might be interested in
<u>ANSWER</u>
(Choice A)
-4(3e+4)
<u>EXPLANATION</u>
The given expression is
We expand to get:
We regroup the terms to get:
Simplify now to get:
We now factor -4 to obtain:
The correct choice is A.
Answer:
The sample size is
Step-by-step explanation:
From the question we are told that
The lower bound of the range is a = 51
The upper bound of the range is b = 710
The margin of error is
Generally the standard deviation is mathematically represented as
=>
=>
From the question we are told the confidence level is 95% , hence the level of significance is
=>
Generally from the normal distribution table the critical value of is
Generally the sample size is mathematically represented as
=>
=>
Answer:
Option d.
Step-by-step explanation:
In a sample with a number n of people surveyed with a probability of a success of , and a confidence level of
, we have the following confidence interval of proportions.
In which
z is the zscore that has a pvalue of .
The margin of error is:
79 percent of adults age 18 years and older in the United States use the Internet.
This means that
98% confidence level
So , z is the value of Z that has a pvalue of
, so
.
Which of the following should be used to find the sample size (n) needed?
We have to find n for which
So the equation is:
Option d.