3 years ago

Which statements about a square are always true?

Mathematics

1 answer:

Ulleksa [173]3 years ago

5 0

It has 4 congruent sides.
All 4 angles are 90°.
Its diagonals are congruent.

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Over the course of a week, an environmental activist randomly stopped 1,200 people on the street and asked whether they were wil

sdas [7]

Sample Size = n = 1200
Number of people who are willing to pay higher = x = 708

Proportion of people who are willing to pay higher = p = $\frac{708}{1200}= \frac{59}{100}=0.59$

Confidence Level = 99%
Z Value = z = 2.58

The confidence interval about a population proportion can be calculated as:

$(p-z \sqrt{ \frac{p(1-p)}{n} }, p+z \sqrt{ \frac{p(1-p)}{n} })$

Using the values, we get:

$(0.59-2.58 \sqrt{ \frac{0.59(0.41)}{1200} } ,0.59+2.58 \sqrt{ \frac{0.59(0.41)}{1200} }) \\ \\ 
(0.553,0.627)$

Thus, at 99% confidence level, the estimated proportion of people willing to pay higher prices for gas in order to protect the environment lies between 0.553 and 0.627.

6 0

3 years ago

Read 2 more answers

Simplify each expression (4ab^3)(-5b^6)(2a^2)

Artemon [7]

<span>(4ab^3)(-5b^6)(2a^2)
= (5 * -4 * 2)(a * a^2)(b^3 * b^6)
= -40a^3b^9

hope it helps</span>

4 0

4 years ago

There are 169 South American animals in a zoo. That is 45 more than half the number of African animals in the zoo. Enter an equa

Paul [167]

Answer:

the n÷45+169=214