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brilliants [131]
3 years ago
5

We use a t distribution for inference about a population mean instead of the standard Normal distribution:

Mathematics
1 answer:
Basile [38]3 years ago
3 0

Answer: d. if we do not know the population standard deviation and must use the sample standard deviation.

Step-by-step explanation:

We use t-distribution is quite similar to distribution of z-score .

The interpretation of t-scores and z-scores are same.

T- distribution is used when the  data is not accurately normal and when the population standard deviation is  unknown.

In the absence of population standard deviation , we use the standard deviation of the sample.

So , We use a t distribution for inference about a population mean instead of the standard Normal distribution if we do not know the population standard deviation and must use the sample standard deviation.

Hence, the correct option is : d. if we do not know the population standard deviation and must use the sample standard deviation.

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worty [1.4K]

Answer:

18.84

Step-by-step explanation:

4 0
3 years ago
Find the side lengths of the triangle in this picture.​
ozzi

Answer:

Hypotenuse: 41 meters, Long leg: 40 meters, Short leg: 9 meters.

Step-by-step explanation:

According to the statement, we have the following information about the lengths of the right triangle:

Hypotenuse

3\cdot x + 14

Long leg

3\cdot x + 13

Short leg

x

By the Pythagoric Theorem, we have the following expression:

(3\cdot x + 14)^{2} = x^{2} + (3\cdot x + 13)^{2} (1)

9\cdot x^{2}+84\cdot x + 196 = x^{2} + 9\cdot x^{2} + 78\cdot x + 169

9\cdot x^{2} + 84\cdot x + 196 = 10\cdot x^{2} + 78\cdot x +169

x^{2} -6\cdot x -27 = 0

(x-9)\cdot (x+3) = 0

As length is a positive variable by nature, then the only possible solution is x = 9. Lastly, the side lengths of the right triangle are:

Hypotenuse: 41 meters, Long leg: 40 meters, Short leg: 9 meters.

8 0
3 years ago
Plz, Help me with this question.
UNO [17]

Answer:

first option

Step-by-step explanation:

Given

area = 15x - 9 ← factor out 3 from each term

       = 3(5x - 3)

Thus the dimensions are 3 by (5x - 3)

6 0
3 years ago
Read 2 more answers
What is the value of x?<br> 39° (3x)°
Likurg_2 [28]

Answer:

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5 0
3 years ago
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Help me please thanks (:
Vlad [161]

Answer:

The first, second, and fourth answer choices are correct.

Step-by-step explanation:

-2.5 is less than -2.

14 is equal to 14.

10 is greater than -12.


I hope this helped! :-)

4 0
4 years ago
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