Answer:
D) 4
Step-by-step explanation:
All real numbers greater than or equal to 1
It takes 8 mins and 20 secs for light to travel to earth
Hello, please consider the following.
When and are two roots, we can factorise as
So for the first equation, we can say that the sum of the zeros is
and the product is
So we can factorise as below.
And the solutions are
For the second equation, we will complete the square and put the constant on the right side and take the root.
Let's do it!
We take the root, and we find the two solutions
Thank you.
Answer:
Due to the larger sample size, the confidence interval of the second group will have greater precision for estimating the population mean.
Step-by-step explanation:
Margin of error of a confidence interval:
The equation for the margin of error of a confidence interval has the following format:
In which z is related to the confidence level, is the standard deviation of the population and n is the size of the sample.
From this, we can infer that a larger size leads to a greater precision of the interval, that is, a lesser margin of error.
In this question:
The sample from the first group survey has 49 data values, and from the second group has 81.
Due to the larger sample size, the confidence interval of the second group will have greater precision for estimating the population mean.