Answer:cause
Step-by-step explanation:
The z score for a confidence level of 99% is 2.575.. You need to know this to complete this type of problem.. the other two commonly used confidence levels are 90% and 95% having z scores of 1.645 and 1.96 respectively. You need to memorize this!
To find the confidence interval, it will be defined as the sample mean plus/minus the margin of error.. Now to find the margin of error, divide the standard deviation of 12 by the square root of the number of elements in your sample(√250). Then take that result and multiply it by the Z score I mentioned above for a 99% confidence level.
In this case: the sample mean is 70 and the margin of error is approximately 1.95
So to calculate the confidence interval, do the following:
70 - 1.95 = 68.05 rounded to the nearest whole number is 68
70 + 1.95 = 71.95 rounded to the nearest whole number is 72
Looks like that would be the last choice. hope this helps.. it's been awhile since my work with statistics :-)
Answer:
I'm assuming that this is supposed to be in algebraic expression form.
Step-by-step explanation:
The <em>product of 6 and a number</em> is expressed as <em>6x.</em> So the expression of 6x less than (use minus symbol) 20, should be written as 6x - 20.
Hope it helps.
4(2d + 5) = 8d + 20
15x + 18y = 3(5x + 6y)
