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Sladkaya [172]
3 years ago
14

Suppose scores on exams in statistics are normally distributed with an unknown population mean and a population standard deviati

on of three points. A random sample of 36 scores is taken and gives a sample mean of 68. Find a 85 % confidence interval estimate for the population mean exam score. Explain what the confidence interval means​
Mathematics
2 answers:
saw5 [17]3 years ago
7 0

Step-by-step explanation:

67.18,68.82

Let mu be the true population mean of statistics exam scores. We have a large random samples of n=36 scores with a sample mean of 68.we know that the population standard deviation is sigma=3.A pivotal quantity is 3^sqrt(36)=(3/6)=68(1/2) which is approximately normally distributed. Therefore the 85%confidence interval is 68-(1/2)(1.6449), 68+(1/2)(1.6449) i.e (67.18,68.82)

Gnom [1K]3 years ago
5 0

this the answer of queastions

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Jlenok [28]
The answer would be C
7 0
3 years ago
Can someone help me with this question
Mashcka [7]
The correct answer here would be D. -1(3x+1)(x+5). You can find this answer by redistributing the problem.

-1(3x+1)(x+5)
-1(3x²+15x+1x+5)
-1(3x²+16x+5)
-3x²-16x-5

Using the math above, we can see that when we redistribute we get the original equation. That makes Choice D correct.
5 0
3 years ago
PLEASE HELP!!!
skelet666 [1.2K]
Translated down is changing y coordinate

(-2,4)
4-6 = -2

Coordinates of A’ is (-2,-2)


(-4,-7)
reflect over the y-axis
(x,y) -> (-x,y)

(-4,-7) -> (4,-7)

Coordinates of B’ is (4,-7)

Hope this helps!
3 0
3 years ago
Read 2 more answers
heather works as a waitress at her family restaurant. she works 2 hours every morning during the breakfast shift and returns to
Marrrta [24]

Answer:

3.6 hours per evening shift

Step-by-step explanation:


5 0
3 years ago
ABD and CBD are adjacent. Given that ABC IS 68° , ABD= (2x+5)°, and CBD = (3x+8) find CBD
aalyn [17]

Answer:

68+2x+5+3x+8=180

81+5x=180

5x=99

x=19.8

CBD=67.4

ABD=44.6

hope it works

7 0
3 years ago
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