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ser-zykov [4K]
3 years ago
15

Please help please brainliest

Mathematics
2 answers:
Cerrena [4.2K]3 years ago
8 0

Answer:

i think its c sorry if am wrong

Delvig [45]3 years ago
4 0
I’m pretty sure it’s c!
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Help please!! (attachment below)
Aleksandr-060686 [28]

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Two different samples will be taken from the same population of test scores where the population mean and standard deviation are
Rom4ik [11]

Answer:

The sample consisting of 64 data values would give a greater precision.

Step-by-step explanation:

The width of a (1 - <em>α</em>)% confidence interval for population mean <em>μ</em> is:

\text{Width}=2\cdot z_{\alpha/2}\cdot \frac{\sigma}{\sqrt{n}}

So, from the formula of the width of the interval it is clear that the width is inversely proportion to the sample size (<em>n</em>).

That is, as the sample size increases the interval width would decrease and as the sample size decreases the interval width would increase.

Here it is provided that two different samples will be taken from the same population of test scores and a 95% confidence interval will be constructed for each sample to estimate the population mean.

The two sample sizes are:

<em>n</em>₁ = 25

<em>n</em>₂ = 64

The 95% confidence interval constructed using the sample of 64 values will have a smaller width than the the one constructed using the sample of 25 values.

  • Width for <em>n</em> = 25:

        \text{Width}=2\cdot z_{\alpha/2}\cdot \frac{\sigma}{\sqrt{25}}=\frac{1}{5}\ [2\cdot z_{\alpha/2}\cdot \sigma]

  • Width for <em>n</em> = 64:

        \text{Width}=2\cdot z_{\alpha/2}\cdot \frac{\sigma}{\sqrt{64}}=\frac{1}{8}\ [2\cdot z_{\alpha/2}\cdot \sigma]

Thus, the sample consisting of 64 data values would give a greater precision.

3 0
4 years ago
Please help, i will give brainliest, i am struggling badly.
Dovator [93]

Answer:

I do not want you to just get this answer and stay with it. I want you to learn.

Step-by-step explanation:

I struggled with this also. What really helped me was a site called Khan Academy. I wish you luck as it helped me.

4 0
3 years ago
If you buy 20 tickets for $6.00, how much are you paying per ticket?
andrew-mc [135]
This is a division problem.

6/20 = 0.3

Answer: You are paying $0.30 per ticket.
8 0
3 years ago
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