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tresset_1 [31]
4 years ago
9

Four research teams each used a different method to collect data on how fast a new iron skillet rusts. Assume that they all agre

e on the sample size and the sample mean (in days). Use the (confidence level; confidence interval) pairs below to select the team that has the smallest sample standard deviation.
A. Confidence Level: 99.7%; Confidence Interval: 40 to 40
B. Confidence Level: 95%; Confidence Interval: 40 to 50
C. Confidence Level: 68%; Confidence Interval: 43 to 47
D. Confidence Level: 95%; Confidence Interval: 42 to 48
Mathematics
2 answers:
svet-max [94.6K]4 years ago
6 0

Answer: for how fast paint dries problem the answer is 68% with A confidence interval of 44.5 to 45.5

Step-by-step explanation: apex

Sati [7]4 years ago
4 0

Answer:

D. Confidence Level: 95%; Confidence Interval: 42 to 48

Step-by-step explanation:

48-42=6

6/2=3

3 is smallest

I tested A and got it incorrect so D is the awnser

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A 25-foot ladder is placed 7 feet from the wall, as shown.
Ludmilka [50]

Answer:

The answer is 8 feet.

Step-by-step explanation:

Let x = height where the ladder hits the building

7 squared+x squared=25 squared

49+x squared=625

x squared=576

x=24 feet

Let x = distance from wall:

x^2 + 20^2 = 25^2

x^2 + 400 = 625

x^2 = 225

x = 15 feet

6 0
3 years ago
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What is a quater of 6​
Dahasolnce [82]
The answer to the question is 1.5
7 0
3 years ago
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Round 290300 to the nearest hundred thousand
SSSSS [86.1K]

Answer:

300,000

Step-by-step explanation:

you have 290 for the first three numbers the 9 is above 5 making the numbere infront of it go up so it would be 300,000

1-5 stays the same and 6-9 go up.

My growing brain on yt has a good ecpelantion if you need more help.

Title of the video Rounding to the Nearest Hundred Thousand / My Growing Brain

6 0
3 years ago
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Gina is cutting construction paper into rectangles for a project. She needs to cut one rectangle that is 12 inches by 14 1/4 inc
Fittoniya [83]

Answer:

278.63 square inches

Step-by-step explanation:

Gina needs to cut two types of rectangles.

Dimensions of one rectangle is given as,

Width = 12 inches

Length = 14\frac{1}{4} = \frac{57}{4} inches

So, the area of this rectangular paper will be

Area = width × length = 12\times \frac{57}{4} = 171 inches²

Dimensions of the other rectangular paper has been given as

Width = 10\frac{1}{4} = \frac{41}{4} inches

Length = 10\frac{1}{2} = \frac{21}{2} inches

So, the area of this rectangle will be

Area = width × length = \frac{41}{4} \times \frac{21}{2} = 107.63 inches²

Thus the total area she need to cut = 171 + 107.63 = 278.63 square inches.

6 0
3 years ago
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Give an example of a sample of the students in a middle school! help asap!! ​
valina [46]

Answer:

A school wanted to see how many students bought orange juice with their lunch. As a result, they sampled 100 lunch-buying students, to see how many of them bought orange juice. In a sample of 100 lunch-buying students, 25 of them bought orange juice with their lunches. If there are 1,000 students in the school that buy lunch, how many students bought orange juice with their food? 250.

Step-by-step explanation:

I'm assuming there's no visual included in the question, and that the example can be completely original.

If you wanted a ratio, you would ask what the ratio was between students that bought lunch and students that bought orange juice with their lunches (often asked in lowest terms).

  1. Sample included 100:25
  2. You want it in lowest terms. Find the lowest common denominator
  3. LCD = 5
  4. New ratio, divided by five to find lowest terms
  5. = 20:5
  6. Every 20 students, 5 of them (also 25% of them) bought orange juice with their lunches.
5 0
3 years ago
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