Wade needs to solve the problem 1 5/8 x - 2 1/2 = -11 4/5. He is not sure what to do first, so he rounds the numbers to take a l
ook at a simpler problem. The equation he writes is 2x - 3 = -12.
From this, he can see that he should start solving the original equation by _____.
adding 11 4/5 to both sides of the equation
subtracting 2 1/2 from both sides of the equation
adding 2 1/2 to both sides of the equation
dividing both sides of the equation by 1 5/8
From this, he can see that he should start solving the original equation by _____.
adding 11 4/5 to both sides of the equation
subtracting 2 1/2 from both sides of the equation
adding 2 1/2 to both sides of the equation
dividing both sides of the equation by 1 5/8
1 answer:
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Complete Question
The 2003 Statistical Abstract of the United States reported the percentage of people 18 years of age and older who smoke. Suppose that a study designed to collect new data on smokers and non smokers uses a preliminary estimate of the proportion who smoke of 0.30.
a. How large a sample should be taken to estimate the proportion of smokers in the population with a margin of error of 0.02? use 95% confidence.
b. Assume that the study uses your sample size recommendation in part (a) and finds 520 smokers. What is the point estimate of the proportion of smokers in the population?
c. What is the 95% confidence interval for the proportion of smokers in the population?
Answer:
a
b
c
Step-by-step explanation:
Considering question a
From the question we are told that
The margin of error is
The preliminary estimate of the proportion who smoke is
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
=>
=>
Considering question b
From the question we are told that
The number of smokers is k = 520
Generally the point estimate of the proportion of smokers in the population is mathematically represented as
=>
Considering question c
Generally 95% confidence interval is mathematically represented as
=>
=>
Answer:
The magnitude of the claimed earthquake would be 13.67.
Step-by-step explanation:
The 1906 earthquake had a intensity of A and a magnitude of 7.8.
S is going to have the same value, so i am going to write as 1. So:
Many pundits claim that the worst is yet to come, with an earthquake 748,180 times as intense as the 1906 earthquake ready to hit San Francisco.
So
So
The magnitude of the claimed earthquake would be 13.67.