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3 years ago

25 POINTS AND BRAINLY(dont answer if u don't know it)

Mathematics

1 answer:

harkovskaia [24]3 years ago

6 0

The expression that represents the density is D = h^2 - 4h + 20/pi h^2

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When conducting a survey, which of the following is a reason to use a random sample?1. To make cause-and-effect connections2. To

Andrews [41]

Answer: 2. To avoid bias

Explanation:

The random sampling can be defined as the method of selecting the samples from the population of interest randomly. The main advantage of this method is to select the samples from the target population and eliminating the bias in sampling. The random sampling is least choice of sampling for research purpose as the researcher wants to choose only selected desired samples for the study.

3 0

3 years ago

Which of the following statements are true about the

Salsk061 [2.6K]

Answer:

w and x are adjacent

w and z are supplementary

y and z are supplementary

x and z are vertical angles

Step-by-step explanation:

3 0

2 years ago

The following table shows a proportional relationship between xxx and yyy. xxx yyy 222 999 555 22.522.522, point, 5 888 363636 W

schepotkina [342]

Answer:

y=4.5x

Step-by-step explanation:

It's right on Khan Academy:)

5 0

4 years ago

Automobile mechanics conduct diagnostic tests on 150 new cars of particular make and model to determine the extent to which they

galben [10]

Answer: 0.0944

Step-by-step explanation:

Given : Sample size of cars : n= 150, sample size is greater than 30 , so we use z-test.

Number of cars tested do have faulty catalytic converters =42

Then the proportion of cars have faulty catalytic converters : $\hat{p}=\dfrac{42}{150}=0.28$

Critical value of z for 99% confidence level : $z_{\alpha/2}=2.576$

Formula for Margin of error :

$E=z_{\alpha/2}\sqrt{\dfrac{\hat{p}(1-\hat{p})}{n}}$

$E=(2.576)\sqrt{\dfrac{0.28(1-0.28)}{150}}\\\\=0.0944377199216\approx0.0944\ \text{Rounded to four decimal places}$

Hence, the required margin of error = $0.0944$

6 0

3 years ago

Explain how the Venn diagrams in this lesson show that all integers and all whole numbers are rational numbers

Vinvika [58]

The Venn diagram shows that rational numbers include all integers (-3, -2, -1, 0, 1, 2, 3,) and all whole numbers (0, 1, 2, 3, 4, 5). Inside the rational numbers circle is the integer circle, and the whole numbers circle, which concludes that all integers and whole numbers are rational numbers.

6 0

3 years ago