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IgorLugansk [536]
2 years ago
7

The manager of a grocery store selected a random sample of 100 customers to estimate the average checkout time. The 90% confiden

ce interval estimate for the average checkout time at the score is[1, 5] minutes. The correct confidence interval interpretation is ___________.
a. 100.0 to 200.0
b. If random samples of 100 customers are repeatedly selected, then that the average checkout time will be between 1 and 5 minutes for 95% of the samples.
c. We estimate with 95% confidence that the average checkout time for the sample of 100 customers is between 1 and 5 minutes.
d. None of these alternatives is correct.
e. We estimate with 95% probability that the average checkout time at the store is between 1 and 5 minutes.
Mathematics
1 answer:
lina2011 [118]2 years ago
3 0

Answer:

c

Step-by-step explanation:

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Answer:

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Step-by-step explanation:

<em>Given that:</em>

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Now, speed of boat 1 changes to 9 knots:

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At 5 pm:

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Now, the situation of distance traveled can be seen by the attached right angled \triangle AOB.

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Using pythagorean theorem:

\text{Hypotenuse}^{2} = \text{Base}^{2} + \text{Perpendicular}^{2}\\\Rightarrow AB^{2} = OA^{2} + OB^{2}\\\Rightarrow AB^{2} = 51^{2} + 54^{2}\\\Rightarrow AB^{2} = 2601+ 2916 = 5517\\\Rightarrow AB = 74.28\ units

so, the total distance between the two boats is 74.28 units.

Change in distance per hour = \dfrac{Total\ distance}{Total\ time}

\Rightarrow \dfrac{74.28}{5} = 14.86\ knots

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