What is a third-degree polynomial function P(x) with rational coefficients so that P(x) = 0 has roots −3 and i?
1 answer:
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Answer:
The y-intercept of the function represented in the graph will be: (0, 2)
The graph is also attached.
Step-by-step explanation:
Given the function
the y-intercept of the function can be determined by setting x=0 and solving for y.
so
Thus, the y-intercept of the function represented in the graph will be: (0, 2)
The graph is also attached.
Given Information:
Mean = μ = $282.45
Standard deviation = σ = $64.50
Sample size = n = 100
Confidence level = 95%
Required Information:
95% Confidence interval = ?
Answer:
95% Confidence interval = ($269.81, $295.09)
Step-by-step explanation:
We are given a Normal Distribution, which is a continuous probability distribution and is symmetrical around the mean. The shape of this distribution is like a bell curve and most of the data is clustered around the mean. The area under this bell shaped curve represents the probability.
What is Confidence Interval?
The confidence interval represents an interval that we can guarantee that the target variable will be within this interval for a given confidence level.
The confidence interval is given by
Where is the mean and MoE is the margin of error given by
Where σ is the standard deviation, n is the sample size and is the z-score corresponding to 95% confidence level.
Finally, the confidence interval is
Therefore, we are 95% sure that the true population mean amount spent per day by a family of four visiting Niagara Falls is within the interval of ($269.81, $295.09)