Mathematics: I-Ready Practice: Equivalent Linear Expressions - Practice - Level G .) Which expressions are equivalent to 4 3 1 y - 2+ y? Choose ALL that apply. 2 4y - 8 5y - 8 3y + 8+ 2y -3y 5y + 8 3y - 8+ 2y .) One way to find equivalent expressions is by expanding and then combining the like terms.

I-Ready Practice: Equivalent Linear Expressions -

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andres2865

29.07.2020

C. The 95% confidence interval is (0.2591, 0.3810). We are 95% confident that the true proportion of students attending the Spring Formal is between 25.91% and 38.10%.

Step-by-step explanation:

The interpretation of a confidence interval at a x% confidence level if that we are x% sure that the true proportion(mean) of the population is in this interval.

Confidence interval

In a sample with a number n of people surveyed with a probability of a success of $\pi$ , and a confidence interval $1-\alpha$ , we have the following confidence interval of proportions.

$\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}$

In which

z is the zscore that has a pvalue of $1 - \frac{\alpha}{2}$

For this problem, we have that:

Seventy-two of the 225 students said they would attend the Spring Formal. So $n = 225, \pi = \frac{72}{225} = 0.32$

95% confidence interval

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 .

The lower limit of this interval is:

$\pi - z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.32 - 1.96\sqrt{\frac{0.32*0.68}{225}} = 0.259$

The upper limit of this interval is:

$\pi + z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.32 + 1.96\sqrt{\frac{0.32*0.68}{225}} = 0.381$

The correct answer is:

C. The 95% confidence interval is (0.2591, 0.3810). We are 95% confident that the true proportion of students attending the Spring Formal is between 25.91% and 38.10%.

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I-Ready Practice: Equivalent Linear Expressions - Practice - Level G
.) Which expressions are equivalent to 4
3
1
y - 2+ y? Choose ALL that apply.
2
4y - 8
5y - 8
3y + 8+ 2y
-3y
5y + 8
3y - 8+ 2y
.) One way to find equivalent expressions is by expanding and then combining the like terms.

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