Answer:
Stem and Leaf Plot:
Stem Leaf
28 1 5 7 8
29 3 4 5
30 6 6 9
Minimum: 281
Maximum: 309
Range: 28
Count: 10
Sum: 2944
Mean: 294.4
Median: 293.5
Mode: 306
Standard Deviation: 9.709
Variance: 94.27
Answer: The explanation is correct.
Step-by-step explanation:
The interpretation of 95% confidence interval for population mean is that "A person can be 95% sure that the true population mean lies in it."
Given : The admissions director from Big City University found that (107.8, 116.2) is a 95% confidence interval for the mean IQ score of all freshmen.
Interpretation: The admissions director can be 95% sure that the true population mean IQ score of all freshmen lies in (107.8, 116.2).
i.e. There is a 95% probability (chance) that the interval from 107.8 to 116.2 contains μ.
Hence, the explanation is absolutely "correct" .
Answer:
Line d y = -3x -3
Line e y = -3x -1
Line f y= -3x+2
To write the equation of a line, you need the slope and the y-intercept. The slope of each line is -3. Find the y-intercept on the graph and then substitute it into the equation y = mx+b for b.
Line d has y-intercept (0,-3)
y = -3x -3
Line e has y-intercept (0,-1)
y = -3x -1
Line f has y-intercept (0,2)
y= -3x+2
10+(1/2)+10+(1/2) 42
------------------------- = -------
2 2
21+15=36
ANSWER
EXPLANATION
Let the function that represent the graph be:
The parabola passes through the points (-2,8), (0,2), and (1,5).
These points must satisfy the function.
For (-2,8), we have
This implies that that,
For (0,2), we have,
This implies that,
For (1,5), we have
This implies that,
Put c=2 into equation (1) and (2).
Add equation (3) and equation (4)
Put a=2 into equation (4).
Therefore the function is
