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Oduvanchick [21]
2 years ago
15

A researcher is 95% confident that the interval from 5.2 hours to 7.8 hours captures u = the true mean amount of time

Mathematics
1 answer:
igor_vitrenko [27]2 years ago
8 0
<h3>Answer: Choice B</h3>

No, this is not a plausible value for the population mean, because 5 is not within the 95% confidence interval.

====================================================

Explanation:

The greek letter mu is the population mean. It has the symbol \mu which looks like the letter 'u' but with a tail at the front or left side.

The question is asking if mu = 5 is plausible if the researcher found the 95% confidence interval to be 5.2 < mu < 7.8

We see that 5 is <u>not</u> in that interval. It's a bit to the left of 5.2

Since mu = 5 is not in the interval, it's not a plausible value for the population mean.

Have we ruled it out with 100% confidence? No. Such a thing is not possible. There's always room for (slight) error. The researcher would need to do a census to be fully confident; however, such practices are very time consuming and expensive. This is the main reason why statistics is important to try to estimate the population with a sample.

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A human heart beats an average of 80 beats per minute.How many beats is this in an hour?express your answer in scientific notati
nlexa [21]

Answer:

4,800

Step-by-step explanation:

Sorry I don't know how to explain it scientifically but I know how to do the calculations

1) Theres 60 minutes in an hour

2) 80x60= 4,800 beats

4 0
3 years ago
6+2x=5-7x WHAT DOES X EQUAL PLEASE ANSWER FAST
ycow [4]

Answer:

x= -1/9

Step-by-step explanation:

6+2x=5-7x

-2x. -2x

6=5-9x

-5. -5

1=-9x/-9

-1/9=x

7 0
3 years ago
Read 2 more answers
Find the perimeter and the area of a rectangle with the sides 4 7/20 m and 6 2/3 m.
Simora [160]

9514 1404 393

Answer:

  • perimeter: 22 1/30 m
  • area: 29 m²

Step-by-step explanation:

The perimeter is given by the formula ...

  P = 2(L+W)

  P = 2(4 7/20 +6 2/3) = 2(10 +61/60) = 2(11 1/60)

  P = 22 1/30 . . . . meters

__

The area is given by the formula ...

  A = LW

  A = (4 7/20)(6 2/3) = (87/20)(20/3) = 87/3 = 29 . . . . square meters

The perimeter is 22 1/30 meters; the area is 29 square meters.

5 0
2 years ago
Ok so i know how to multiply in scientific notation but this one is so hard. pls help and PLS show your work.
juin [17]
Basically if you have an exponent at the end of a 10, 10^{7} , then in the end the extended notation is going to have 7 zeros. So it'll be 10000000. Then you multiply whats in the rest of the equation together. There's the beginning :) I hope it helps.
4 0
2 years ago
30 divided by blank equal 3
anyanavicka [17]

Answer:

10

Step-by-step explanation:

30÷?=3

30÷3 =10

so 30÷10=3

6 0
3 years ago
Read 2 more answers
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