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kiruha [24]
3 years ago
14

A field tet for a new exam was given to randomly selected seniors. The exams were graded, and the sample mean and sample standar

d deviation were calculated. Based on the results, the exam creator claims that on the same exam, nine times out of ten, seniors will have an average score within 3% of 69%.
Is the confidence interval at 90%, 95%, or 99%? What is the margin of error? Calculate the confidence interval and explain what it means in terms of the situation.
Mathematics
1 answer:
Ksenya-84 [330]3 years ago
3 0

Answer: Need to clarify more about the question, I dont understand. Sorry ;//

Step-by-step explanation:

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Find the value of each variable
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Answer:

The correct answer is option C

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Step-by-step explanation:

Points to remember

The angles of a right angled triangle, 30°, 60° and 90° then sides are in the ratio, 1: √3 : 2

<u>To find the value of variables</u>

From the figure we can see 2 right angled triangle with angle 30, 60 and 90

we get, d= 5 then b = 5√3

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Therefore the correct answer is option C

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