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Sedaia [141]
2 years ago
5

What is the constant in the mathematical expression? 3/4ab+7.5

Mathematics
1 answer:
melamori03 [73]2 years ago
5 0

Answer:

Therefore, 7.5 is the constant in mathematical expression.


Step-by-step explanation:

Given the mathematical expression:

\frac{3}{4}ab+7.5Explanation[tex]\frac{3}{4} is cofficient of ab in this expression.

ab is variable( whose values can be changed).

7.5 is a constant term ( whose value can't be changed).

Therefore, 7.5 is the constant in mathematical expression.



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The owners of Prim's Pizza are concerned that many of their customers are starting to purchase pizza from The Pizza Palace becau
AleksandrR [38]

Answer:

(240-210) -1.984 \sqrt{\frac{8.6^2}{100}+\frac{5.7^2}{100}}=27.953

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And the confidence interval for the difference is between:

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Step-by-step explanation:

We have the following info given:

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\bar X_2 = 210 sample mean for medium Pizzas from Pizza Place

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n_1 =n_2 = 100  sample size selected for each case

The confidence interval for the difference of means is given by:

(\bar X_1 -\bar X_2) \pm t_{\alpha/2}\sqrt{\frac{s^2_1}{n_1} +\frac{s^2_2}{n_2}}

And for the 95% confidence we need a significance level of \alpha=1-0.95=0.05 and \alpha/2 =0.025, the degrees of freedom are given by:

df= n_1 +n_2 -2= 100+100-2 =98

And the critical value would be

t_{\alpha/2}= 1.984

And replacing we got:

(240-210) -1.984 \sqrt{\frac{8.6^2}{100}+\frac{5.7^2}{100}}=27.953

(240-210) +1.984 \sqrt{\frac{8.6^2}{100}+\frac{5.7^2}{100}}=32.047

And the confidence interval for the difference is between:

27.953 \leq \mu_1 -\mu_2 \leq 32.047

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