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PIT_PIT [208]
2 years ago
6

Estimate 0.52 + 1.2 and explain how you made your estimate. Please hurry this is due soon!!

Mathematics
2 answers:
Alex777 [14]2 years ago
8 0

Answer:

1.72

Step-by-step explanation:

0.52 plus 1.2 is equal to 1.72

Tamiku [17]2 years ago
8 0

Answer:

1.5

Step-by-step explanation:

0.52+1.2

approx.

0.5+1.0=1.5

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8.23 A manufacturing company produces electric insulators. You define the variable of interest as the strength of the insulators
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Answer:

The 95% confidence interval estimate for the population mean force is (1691, 1755).

Step-by-step explanation:

According to the Central Limit Theorem if we have an unknown population with mean μ and standard deviation σ and appropriately huge random samples (n > 30) are selected from the population with replacement, then the distribution of the sample mean will be approximately normally.

The sample selected here is <em>n</em> = 30.

Thus, the sampling distribution of the sample mean will be normal.

Compute the sample mean and standard deviation as follows:

\bar x=\frac{1}{n}\sum x=\frac{1}{30}\times 51702=1723.4\\\\s=\sqrt{\frac{1}{n-1}\sum (x-\bar x)^{2}}=\sqrt{\frac{1}{30-1}\times 232561.2}=89.55

Construct a 95% confidence interval estimate for the population mean force as follows:

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

    =1723.4\pm 1.96\times\frac{89.55}{\sqrt{30}}\\\\=1723.4\pm 32.045\\\\=(1691.355, 1755.445)\\\\\approx (1691, 1755)

Thus, the 95% confidence interval estimate for the population mean force is (1691, 1755).

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