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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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The probability of event a is x, and the probability of event b is y. if the two events are independent, which condition must be
nalin [4]

Condition (A) P(B/A) = y is true.

<h3>What is probability?</h3>
  • Probability is an area of mathematics that deals with numerical descriptions of how probable an event is to occur or how likely a statement is to be true.

To find the true condition:


If two events are independent, then:

  • Pr(A∩B) = Pr(A) . Pr(B)

Use formulas for conditional probabilities:

  • Pr(A/B) = Pr(A∩B) / Pr(B)
  • Pr(B/A) = Pr(B∩A) / Pr(A)

For independent events these formulas will be:

  • Pr(A/B) = Pr(A∩B) / Pr(B) = Pr(A) . Pr(B) / Pr(B) = Pr(A)
  • Pr(B/A) = Pr(B∩A) / Pr(A) = Pr(B) . Pr(A) / Pr(A) = Pr(B)

Now in your case, Pr(A) = x and Pr(B) = y.

  • Pr(A/B) = x, Pr(B/A) = y, Pr(A∩B) = x.y

Therefore, condition (A) P(B/A) = y is true.

Know more about probability here:

brainly.com/question/25870256

#SPJ4

The complete question is given below:

The probability of event A is x, and the probability of event B is y. If the two events are independent, which of these conditions must be true?

a. P(B|A) = y

b. P(A|B) = y

c. P(B|A) = x

d. P(A and B) = x + y

e. P(A and B) = x/y

5 0
1 year ago
What is the inverse of f(x) = sqft x+ 3
grin007 [14]

Answer:

f^{-1} (x)=x^{2} -3

Step-by-step explanation:

Given the function

f\left(x\right)=\sqrt{x+3}

We can find the inverse function by exchanging x and y, and then solve for y.

y=\sqrt{x+3}

Replace x with y.

x=\sqrt{y+3}

square both sides

x^2=y+3

y=x^2-3

Hence,

f^{-1} (x)=x^{2} -3

8 0
3 years ago
¿ cuáles son los adjetivos? y ¿ cuáles son los adjetivos ? por favor es para hoy <br>​
QveST [7]

Answer:

1) maldava y despota

2) pequenos

Step-by-step explanation:

4 0
3 years ago
Frank grows evergreen trees. He grew 535 trees for
TiliK225 [7]

Answer:

  1. Frank grows 535 trees during holiday season
  2. in November sold 215
  3. then dec sold 275
  4. 535 minus 490 which gives a total of 45 trees left
  5. then to find out how many trees he will have next season 650 plus 45 gives 695
3 0
3 years ago
Pls help me with either one
blagie [28]

7. 65 + 75 = 140

180 - 140 = 40

( I think this is the answer)

6 0
3 years ago
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