Suppose the distribution of the daily calcium intake of Americans is left skewed with a mean of 800 mg and a standard deviation
1 answer:
Answer:
Central limit theorem
Step-by-step explanation:
By central limit theorem. The sampling distribution will have the same mean as the original distribution.
The sampling distribution will have a standard deviation of , so it cannot be a fixed 16. Also,the normal approximation improves with increasing sample size.
Therefore, the correct answer about the sampling distribution of distribution X
is central limit theorem.
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Answer:
C. The x-coordinate of the vertex must be 6
Step-by-step explanation:
The parabola intercepts the x-axis when y = 0.
Therefore, if the quadratic equation has the points (2, 0) and (10, 0) then the x-intercepts or "zeros" are x = 2 and x = 10.
The x-coordinate of the vertex is the midpoint of the zeros.
Therefore, the solution is option C.
<u>Additional Information</u>
The leading coefficient of a quadratic tells us if the parabola opens upwards or downwards:
- Positive leading coefficient = parabola opens upwards
- Negative leading coefficient = parabola opens downwards
We have not been given this information and so therefore cannot determine the way in which it opens.
As we do not know the way in which way the parabola opens, we cannot determine if the parabola will have a negative or positive y-intercept.
We have not been given the full quadratic equation, and so we cannot determine if the parabola is wider (or narrower) than the parent function.