All categories

3 years ago

Select all choices which could lead to a biased result.

Mathematics

2 answers:

kobusy [5.1K]3 years ago

8 0

<h2>Answer:</h2>

The answers are as follows:

Biases samples are those where some members of the population are not included in the survey. These samples produce biases results.

The statements that could lead to biased results are :

1. Giving a standardized test to a class of at-risk students : Only at risk students are biased samples here.

2. Asking players on a school football team how much they study : The school football team will have a very few students as compared to the whole school.

3. Asking Republicans for their opinion about a Democrat-sponsored bill : The republicans here are a part of all the population that contains democrats, liberals and republicans. So sample is biased.

Alex Ar [27]3 years ago

7 0

Giving a standardized test to a class of at-risk students

asking players on a school football team how much they study

asking Republicans for their opinion about a Democrat-sponsored bill

You might be interested in

Caroline was thinking of a number. Caroline halves the number and gets 7.3. Form an equation with x from the information.

Damm [24]

Answer:

The equation is: $\frac{x}{2} = 7.3$

Step-by-step explanation:

Caroline was thinking of a number.

We are going to call this number x.

Caroline halves the number and gets 7.3.

To find half of a number, we multiply by 1/2. So

$\frac{1}{2} \times x = 7.3$

$\frac{x}{2} = 7.3$

6 0

2 years ago

The human resource department at a certain company wants to conduct a survey regarding worker benefits. The department has an al

Mama L [17]

Answer:

Explained below.

Step-by-step explanation:

The human resource department at a certain company wants to conduct a survey regarding worker morale. The department has an alphabetical list of all 4,502 employees at the company and wants to conduct a systematic sample of size 50.

Systematic sampling is a kind of probability sampling method in which individuals from a larger population are nominated according to a random initial point and a static, periodic interval.

(a)

A sample of size 50.

Then the value of <em>k</em> will be: $k=\frac{4502}{50}=90.04\approx 50$

Thus, the value of <em>k</em> is 90.

(b)

Label the employees from 1 to 4502.

And select every 90th employee.

So, the individuals who will be administered the survey are:

90th, 180th, 270th,...

7 0

3 years ago

A bag contains 42 red marbles, 6 white marbles, and 8 gray marbles. You randomly pick out a marble, record its color, and put it

Elanso [62]

For any single draw,

$\mathbb P(\text{white})=\dfrac6{42+6+8}=\dfrac6{56}$
$\mathbb P(\text{gray})=\dfrac8{42+6+8}=\dfrac8{56}$

Drawing a white marble or a gray marble are disjoint events; only one of them can happen. So

$\mathbb P(\text{white or gray})=\mathbb P(\text{white})+\mathbb P(\text{gray})-\underbrace{\mathbb P(\text{white and gray})}_0$
$\mathbb P(\text{white or gray})=\dfrac6{56}+\dfrac8{56}=\dfrac{14}{56}$

Out of 224 draws, you should expect $\dfrac{14}{56}\times224=56$ of the marbles to be either white or gray.

6 0

3 years ago

Read 2 more answers

What are two consecutive numbers whose cube differs by 271

valentina_108 [34]

Answer:

Two consecutive numbers cubes differ by 271. Let the two consecutive numbers be x and x + 1. The difference of the two consecutive numbers is 271. ( x + 1 ) ^3 - x ^3 = 271. 1 + 3 x ^ 2 + 3 x - 271 = 0.

Step-by-step explanation:

7 0

2 years ago

Read 2 more answers

Can you very be kind and answer

Lera25 [3.4K]

area of a circle is PI x r^2

2 = d/2 = 5.4/2 = 2.7 cm

using 3.14 for PI

3.14 x 2.7^2 = 22.89 square inches

360 degree in a circle, shaded area is 180 degree, which is 50%

so 22.89 x .5 = 11.45 cm^2

4 0

3 years ago