Answer:
D.
Step-by-step explanation:
Which statements about the graph of the function f(x) = –x2 – 4x 2 are true? select three options. the domain is {x|x ≤ –2}. the
1 answer:
The graph of the function f(x) = –x^2 – 4x +2 are true options 1 and 4 are correct.
We have the given,
The graph of the function f(x) = –x^2 – 4x+ 2
The statements that agree with the graph of the equation are as follows:
1. The domain is {x|x ≤ –2}.
<h3>What is the domain?</h3>The set of points at which function is defined.
4. The function is decreasing over the interval (−4, ∞).
From the given graph,
We can say that the above statements are true.
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Answer:
The 95% confidence interval for the number of hours students in their college study is between 8.98 hours and 15.42 hours.
Step-by-step explanation:
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 = 49 - 1 = 48
95% confidence interval
Now, we have to find a value of T, which is found looking at the t table, with 48 degrees of freedom(y-axis) and a confidence level of . So we have T = 2.0106
The margin of error is:
M = T*s = 2.0106*1.6 = 3.22
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 12.2 - 3.22 = 8.98 hours.
The upper end of the interval is the sample mean added to M. So it is 12.2 + 3.22 = 15.42 hours.
The 95% confidence interval for the number of hours students in their college study is between 8.98 hours and 15.42 hours.