We'll first convert the mixed fractions to "improper" and then get their product, since the area of a rectangle is the product of its length and width.
A sine function increasing through the origin can be used to model light waves. Violet light has a wavelength of 400 nanometers.
Over which interval is the height of the wave decreasing, only?
(1) (0, 200)
(2) (100, 300)
(3) (200, 400)
(4) (300, 400)
(1) (0, 200)
(2) (100, 300)
(3) (200, 400)
(4) (300, 400)
1 answer:
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Given Information:
Number of lithium batteries = n = 16
Mean life of lithium batteries = μ = 645 hours
Standard deviation of lithium batteries = σ = 31 hours
Confidence level = 95%
Required Information:
Confidence Interval = ?
Answer:
Step-by-step explanation:
The confidence interval is given by
Where μ is the mean life of lithium batteries, σ is the standard deviation, n is number of lithium batteries selected, and t is the critical value from the t-table with significance level of
tα/2 = (1 - 0.95) = 0.05/2 = 0.025
and the degree of freedom is
DoF = n - 1 = 16 - 1 = 15
The critical value (tα/2) at 15 DoF is equal to 2.131 (from the t-table)
Therefore, the 95% confidence interval is 628.5 to 661.5 hours
What does it mean?
It means that we are 95% confident that the mean life of 16 lithium batteries is within the interval of (628.5 to 661.5 hours)
