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Marat540 [252]
3 years ago
13

The student scores on a history test are normally distributed with an unknown population mean and standard deviation A random sa

mple of 38 scores is taken and results in a sample mean of 85 points and sample standard deviation of 4 points. dr 0,10 0.0 0.025 0.01 0.005 3 1.306 1.690 2.030 2.438 2.724 1.306 1.688 2.028 2.434 2.719 1.305 1687 2.026 2.431 2.715 1.304 1.686 2.024 2.429 2.712 1.304 1685 2.023 2.426 2.708
Find a 90% confidence interval estimate for the population mean using the Student's distribution . Round the final answers to two decimal places.
Mathematics
1 answer:
Snezhnost [94]3 years ago
6 0

Answer:

The 90% confidence interval = (83.9, 86.1)

Step-by-step explanation:

The formula for confidence interval =

Mean ± z × standard deviation/√n

From the question:

n = 38

Mean = 85 points

Standard deviation = 4 points

Z score for 90% confidence interval = 1.645

85 ± 1.645 × 4/√38

85 ± 1.067416951

Confidence Interval =

85 - 1.067416951

= 83.932583049

≈ 83.9

85 + 1.067416951

= 86.067416951

≈ 86.1

Therefore, the 90% confidence interval = (83.9, 86.1)

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15 points?Im just being lazy Lol​
Doss [256]

Answer:

38

Step-by-step explanation:

The 38-deg angle and <6 are vertical angles, so they are congruent.

m<6 = 38 deg

8 0
3 years ago
Read 2 more answers
What is the mean absolute deviation of the data set?
neonofarm [45]

Answer:

<u>B. 2</u>

To find MAD, find the mean of the set, then find how far each number is from the mean. Next, find the mean of THAT set of numbers. Yea, I know it's a bit confusing... don't worry!

Find the mean of the set:

12 + 10 + 10 + 8 + 6 + 7 + 7 + 12

72

72 / 8

<u>9</u>

Find how far each number is from 9:

12 - 9 = <u>3</u>

10 - 9 = <u>1</u>

10 - 9 = <u>1</u>

9 - 8 = <u>1</u>

9 - 6 = <u>3</u>

9 - 7 = <u>2</u>

9 - 7 = <u>2</u>

12 - 9 = <u>3</u>

Find the mean of that number set:

{3, 1, 1, 1, 3, 2, 2, 3}

3 + 1 + 1 + 1 + 3 + 2 + 2 + 3

16

16 / 8

<u>2</u>

<u>So the answer is 2!</u>

Not so hard after all   :D

7 0
3 years ago
Read 2 more answers
A science student wants to study how fast an ant walks which quantity makes the most sense for his study
klasskru [66]

Inches per second is a convenient unit for ant speed.


Second choice.



4 0
4 years ago
Draw a picture to show the value of 5 x (3 + 7)
Lerok [7]
If we do 3 + 7 the first one it would 10 and the other one is also 10 so if we add 10+10 is would equal to 20 and if we do 20 x 5 it would 100. Your answer would be 100
6 0
3 years ago
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Veseljchak [2.6K]

I'll give you a hint. <u><em>You had to used pemdas stands for: p-parenthesis, e-exponents, m-multiply, d-divide, a-add, and s-subtracting.</em></u>

First you had to calculate with parenthesis first.

(6-4)=2-9

Then you add and subtract from left to right.

2-9=-7

Final answer \boxed{=-7}

Hope this helps!

And thank you for posting your question at here on brainly, and have a great day.

-Charlie

5 0
4 years ago
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