3 years ago

Solve the equation: 3t²-3t+1=0

Mathematics

2 answers:

vampirchik [111]3 years ago

4 0

Answer:

?? im not very good at math

Step-by-step explanation:

podryga [215]3 years ago

3 0

Answer:

There are no solutions

Step-by-step explanation:

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3 years ago

Write two different pairs of negative integers x and y, that make the statement x-y=2 true.

Contact [7]

Answer:

x = -1

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Step-by-step explanation:

-1 - (-3) =

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-3 - (-5) =

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4 years ago

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4 years ago

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3 years ago

You need to compute the a 90% confidence interval for the population mean. How large a sample should you draw to ensure that the

RSB [31]

Answer:

The sample size required is 102.

Step-by-step explanation:

The (1 - α)% confidence interval for population mean μ is:

$CI=\bar x\pm z_{\alpha/2}\times\frac{\sigma}{\sqrt{n}}$

The margin of error for this interval is:

$MOE= z_{\alpha/2}\times\frac{\sigma}{\sqrt{n}}$

Given:

σ = 9.2

(1 - α)% = 90%

MOE = 1.5

The critical value of z for 90% confidence level is:

$z_{0.10/2}=1.645$

*Use a z-table.

Compute the value of n as follows:

$MOE= z_{\alpha/2}\times\frac{\sigma}{\sqrt{n}}$

$n=[\frac{z_{\alpha/2}\times \sigma}{MOE}]^{2}$

$=[\frac{1.645\times 9.2}{1.5}]^{2}\\=101.795\\\approx102$

Thus, the sample size required is 102.

5 0

3 years ago