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mart [117]
3 years ago
5

The weight of a bucket of fish was more than 23 pounds. Doria wants to write an inequality for the weight of the bucket of fish.

She uses the variable w to represent the weight. Which inequality should Doria write?
Mathematics
2 answers:
GuDViN [60]3 years ago
8 0
Doria should write 23<w somewhere in her equation because whatever the answer is, it will be more than 23
nadezda [96]3 years ago
8 0

Answer:

The inequality that represents the weight of bucket of fish is:

w > 23

Step-by-step explanation:

It is given that:

The weight of a bucket of fish was more than 23 pounds.

This means that the weight of the bucket fish can't be less than or equal to 23 it has to be greater or we may say strictly greater than 23.

Let w be the variable that Doria used to represent the weight of the bucket of fish.

so, the inequality that Doria will get regarding the weight of the bucket of fish is:

w > 23

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a) \frac{(8)(30.23)^2}{20.09} \leq \sigma^2 \leq \frac{(8)(30.23)^2}{1.65}

363.90 \leq \sigma^2 \leq 4430.80

Now we just take square root on both sides of the interval and we got:

19.08 \leq \sigma \leq 66.56

b) For this case we are 98% confidence that the true deviation for the population of interest is between 19.08 and 66.56

Step-by-step explanation:

423.6, 487.3, 453.2, 402.9, 483.0, 477.7, 442.3, 418.4, 459.0

Part a

The confidence interval for the population variance is given by the following formula:

\frac{(n-1)s^2}{\chi^2_{\alpha/2}} \leq \sigma^2 \leq \frac{(n-1)s^2}{\chi^2_{1-\alpha/2}}

On this case we need to find the sample standard deviation with the following formula:

s=sqrt{\frac{\sum_{i=1}^8 (x_i -\bar x)^2}{n-1}}&#10;And in order to find the sample mean we just need to use this formula:&#10;[tex]\bar x =\frac{\sum_{i=1}^n x_i}{n}

The sample deviation for this case is s=30.23

The next step would be calculate the critical values. First we need to calculate the degrees of freedom given by:

df=n-1=9-1=8

The Confidence interval is 0.98 or 98%, the value of \alpha=0.02 and \alpha/2 =0.01, and the critical values are:

\chi^2_{\alpha/2}=20.09

\chi^2_{1- \alpha/2}=1.65

And replacing into the formula for the interval we got:

\frac{(8)(30.23)^2}{20.09} \leq \sigma^2 \leq \frac{(8)(30.23)^2}{1.65}

363.90 \leq \sigma^2 \leq 4430.80

Now we just take square root on both sides of the interval and we got:

19.08 \leq \sigma \leq 66.56

Part b

For this case we are 98% confidence that the true deviation for the population of interest is between 19.08 and 66.56

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3 years ago
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