3 years ago

Answers or correcting???

Mathematics

1 answer:

never [62]3 years ago

7 0

Answer:

Answers

Step-by-step explanation:

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A consumer group selected 100 different airplanes at random from each of two large airlines. The mean seat width for the 100 air

Novay_Z [31]

Answer:

Decreasing the sample size decreases the width of the confidence interval.

Step-by-step explanation:

-Let s be the sample standard deviation and $\bar X$ be the sample mean.

#We calculate the 95% confidence interval for the sample size 100 as below:

$\bar X\pm z_{0.05/2}\frac{s}{\sqrt{n}}\\\\\\=\bar X\pm 1.960\times\frac{s}{\sqrt{50}}\\\\\\=\bar X\pm 0.1960s$

#we then calculate the confidence interval of sample size =50 and of similar mean and standard deviation:

$\bar X\pm z\frac{s}{\sqrt{n}}\\\\\\=\bar X\pm z_{0.05/2}\times\frac{s}{\sqrt{n}}\\\\\\=\bar X\pm1.960\times \frac{s}{\sqrt{50}}\\\\\\\\=\bar X\pm0.2772s$

#Notice that the smaller sample(n=50) has a narrower confidence interval.

Hence, decreasing the sample size decreases the width of the confidence interval.

6 0

3 years ago

Read 2 more answers

Please help! Solve for a.

Marat540 [252]

What am I solving? Like what is the question?

3 0

3 years ago

How to solve this problem <br> 19/11÷4 5/11

mihalych1998 [28]

It will be .422222222 because if you divide the to fraction first then you will get the different numbers and then you will divide them to getter and there you have your answer.422222222

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3 years ago

4( x - 3 ) - 5x ≥ -1 Can someone solve for this plz ?

satela [25.4K]

Answer:

Step-by-step explanation:

4x - 12 - 5x ≥ -1

-x - 12 ≥ -1

-x ≥ 11

x ≤ -11

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Some people advise that in very cold weather, you should keep the gas tank in your car more than half full. Lou's car had 6.8

tamaranim1 [39]

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4 years ago