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Veronika [31]
3 years ago
7

A recent study reported the mean body mass index (BMI) for adults in the United States was 26.8. A researcher believes the mean

BMI of marathon runners is less than 26.8. A random sample of 35 marathon runners had a mean BMI of 22.7 with a standard deviation of 3.1. The researcher will conduct a one-sample t-test for a population mean. Have the conditions for inference been met
Mathematics
2 answers:
Korolek [52]3 years ago
7 0

No, because marathon runners are not a representative sample of all adults in the United States.

Svetllana [295]3 years ago
4 0

Answer:

Yes

Step-by-step explanation:

We are told its random

It is aproximately Normal because the sample size is greater than 30, (35), and we have a mean and a SD.

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PLS HELP 20 POINTS
never [62]

Answer:

3162.5m^3

Step-by-step explanation:

V=a^2\frac{h}{3} \\=19.8^2\frac{24.2}{3} \\=3162.46\\=3162.5m^3

6 0
3 years ago
A fair 66-sided die is rolled 77 times and the resulting sequence of 77 numbers is recorded. A) How many different sequences are
Stella [2.4K]

Answer: A. 279936 sequences.

B. 2187 sequence.

C. 7776 sequence.

D. 46656 sequence

E. 64 sequence.

Step-by-step explanation:

Given data:

A 6 sided fair die

No of time rolled = 7

Resulting sequence recorded = 7.

Solution.

A.) No of different possible sequence

= 6^7

= 279936 sequences.

B.) Sequence consisting of only even number

= there are 3 even numbers between 1 and 7 ( 2,4,6).

= 3^7

= 2187 sequence.

C.) possible sequences are when the first, third, and fourth numbers must be the same.

= 6* 6 ^n

where n = 4

= 6*6^4

= 7776 sequence.

D.) sequence when every number is different.

There are 6 sides of a die, so when every number is different it is.

= 6^6

= 46656 sequence

E.) sequence when atleast there are two numbers that are the same.

= 2^6

= 64 sequence.

3 0
3 years ago
Fix the inequality below to correctly show the domain of<br> the function.
Nataliya [291]

Answer:

from questions it is given that X is lies between the -9 and -5. In this question X lies only between -9 to -5 but -9 and -5 are excluded because there is no equal sign given in the question. so value of X are (-8,-7,-6). and plot in the graph .and these values are the component of X so they are also a domain.

6 0
2 years ago
Why is 20 to 40 a 100% increase
Oksi-84 [34.3K]

increasing 20 to 40 is the same as increasing 20 by 20 (or itself), so it is a 100% increase. Decreasing 40 to 20 is the same as decreasing 40 by 1/2 or by 20. So it is a 50% increase.

when going from 20 to 40, the number is being doubled, and when youre going from 40 to 20 you are cutting the number in half. 

hope this helped:)

8 0
3 years ago
What is the answer to 24+n/4=10
MA_775_DIABLO [31]

Answer:

n = -56

Step-by-step explanation:

first subtract the 24 from both sides. you get -14.

then multiply 4 to -14.

you get -56

8 0
4 years ago
Read 2 more answers
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