Which pair of numbers does the square root of 5 fall between
2 answers:
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Answer:
The 90% confidence interval for the mean nicotine content of this brand of cigarette is between 20.3 milligrams and 30.3 milligrams.
Step-by-step explanation:
We have the standard deviation for the sample, so we use the t-distribution to solve this question.
The first step to solve this problem is finding how many degrees of freedom, we have. This is the sample size subtracted by 1. So
df = 9 - 1 = 8
90% confidence interval
Now, we have to find a value of T, which is found looking at the t table, with 8 degrees of freedom(y-axis) and a confidence level of . So we have T = 1.8595
The margin of error is:
M = T*s = 1.8595*2.7 = 5
In which s is the standard deviation of the sample.
The lower end of the interval is the sample mean subtracted by M. So it is 25.3 - 5 = 20.3 milligrams
The upper end of the interval is the sample mean added to M. So it is 25.3 + 5 = 30.3 milligrams.
The 90% confidence interval for the mean nicotine content of this brand of cigarette is between 20.3 milligrams and 30.3 milligrams.
Answer:
There are 35 adult dogs and 20 puppies
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Step-by-step explanation:
<em>Represent the puppies with P and the Adult dogs with A</em>
Given
Dogs = 55
Required
Determine A and P
First, we need to sum the ratios;
Adult Dogs is then calculated as follows;
Puppies is calculated by subtracting the number of adult dogs from the total
<em>Hence;</em>
<em>There are 35 adult dogs and 20 puppies</em>