Brainliest to best answer
1 answer:
Answer:
B. 3x -7y < -21
Step-by-step explanation:
For this problem, a quick way to the correct answer choice is to determine on which side of the y-intercept the equation tells you the solution lies. That is ...
- set x=0
- divide by the coefficient of y
Doing this transforms the answer choices to ...
A: y < 3
B: y > 3
C: y > -3
D: y < -3
The graph clearly shows the solution space on the y-axis is in the region y > 3, matching choice B.
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Answer:
The 90% confidence interval for the mean test score is between 77.29 and 85.71.
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 = 25 - 1 = 24
90% confidence interval
Now, we have to find a value of T, which is found looking at the t table, with 24 degrees of freedom(y-axis) and a confidence level of . So we have T = 2.064
The margin of error is:
In which s is the standard deviation of the sample and n is the size of the sample.
The lower end of the interval is the sample mean subtracted by M. So it is 81.5 - 4.21 = 77.29
The upper end of the interval is the sample mean added to M. So it is 81.5 + 4.21 = 85.71.
The 90% confidence interval for the mean test score is between 77.29 and 85.71.
Answer:
16/15
Step-by-step explanation:
The two minus signs cancel, so the result is positive.