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3 years ago

Help or the gremlins under your bed will eat all your cookies

Mathematics

1 answer:

Alex73 [517]3 years ago

3 0

Answer:

what do you need help with exactly

Step-by-step explanation:

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Which of the following represents a function

tatuchka [14]

Answer:

Step-by-step explanation:

A has -1 going to two different y values so it is not a function

B has x = -1 going to two different y values so it is not a function

C has the input of 3 going to two different y values so it is not a function

D each input goes to only 1 output so it is a function

6 0

3 years ago

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The scale on a map is 1:10 000

WARRIOR [948]

170cm apart on the map and 0.71 kilometers on the map

7 0

3 years ago

The specification for the pull strength of a wire that connects an integrated circuit to its frame is 10 g or more. In a sample

Wittaler [7]

Answer:

The 95% confidence interval for the difference is (-0.1888, 0.0202).

Step-by-step explanation:

Difference between proportions:

The distribution of the difference between two proportions has mean of the difference between these proportions and standard deviation is the square root of the sum of the variances. So

In a sample of 86 units made with gold wire, 68 met the specification

This means that:

$pX = \frac{68}{86} = 0.7907$

$sX = \sqrt{\frac{0.7907*0.2093}{86}} = 0.0439$

In a sample of 120 units made with aluminum wire, 105 met the specification.

This means that:

$pY = \frac{105}{120} = 0.875$

$sY = \sqrt{\frac{0.875*0.125}{120}} = 0.0302$

Difference:

$p = pX - pY = 0.7907 - 0.875 = -0.0843$

$s = \sqrt{sX^2 + sY^2} = \sqrt{0.0439^2+0.0302^2} = 0.0533$

Confidence interval:

$p \pm zs$

In which z is the zscore that has a pvalue of $1 - \frac{\alpha}{2}$ , with $\alpha$ being 1 subtracted by the confidence level.

95% confidence level

So $\alpha = 0.05$ , z is the value of Z that has a pvalue of $1 - \frac{0.05}{2} = 0.975$ , so $Z = 1.96$ .

Lower bound of the interval:

$p - zs = -0.0843 - 1.96*0.0533 = -0.1888$

Upper bound of the interval:

$p + zs = -0.0843 + 1.96*0.0533 = 0.0202$

The 95% confidence interval for the difference is (-0.1888, 0.0202).

6 0

3 years ago

Using substitution, which value of x makes this equation true?<br><br> 3+x = 10

Firdavs [7]

Answer:

Step-by-step explanation:

3 0

3 years ago

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A circular walk is 1.5 meters wide, if the outer circumference is 72 meters, what is the inside diameter of the walk?

sukhopar [10]

9514 1404 393

Answer:

about 19.92 meters

Step-by-step explanation:

The circumference is ...

C = πd

72 m = πd . . . . . for outer diameter d

d = (72 m)/π

The inner diameter is 3 meters shorter, so is ...

inner diameter = (72/π) m - 3 m ≈ 19.92 m

4 0

3 years ago