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Alexeev081 [22]
3 years ago
14

A researcher posts a radio advertisement offering $35 in exchange for participation in a short study. The researcher accepts the

first eight people who respond to the advertisement. Which of the following statements is true about the sample? (5 points) a It is a valid sample because the first eight people were selected to participate. b It is not a valid sample because it is not a random sample of the population. c It is a valid sample because money was offered to participants. d It is not a valid sample because it is only a short study.
Mathematics
1 answer:
Mariulka [41]3 years ago
7 0
B) not valid because it is not a random sample

a) is biased because the first 8 people are unlikely to be representative of the population
c) is biased as offering money will influence the people who reply
d) is untrue because short studies are valid if they are representative
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ohaa [14]

Answer:

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6 0
2 years ago
6. You are given a sheet of cardboard that is 8.0 in. x 11.0 in. How many full circles with a diameter of 3.0 inches can you cut
larisa86 [58]
In order to answer this, it would be useful to calculate the area of the cardboard and the circles. We do as follows:

Total area of cardboard = <span> 8.0 in. x 11.0 in = 88 in^2

Area of one circle = pi(r^2) = pi(0.5)^2 = 0.7854 in^2

Number of full circles = 88 / 0.7854 = 112.0451

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4 0
3 years ago
Which of the following shows the interval of the domain where
Arte-miy333 [17]

The domain of the function where the function is decreasing is (-∞, 1). Then the correct option is D.

<h3>What are domain and range?</h3>

The domain means all the possible values of the x and the range means all the possible values of the y.

The function is given below.

f(x) = x² - 2x + 5

The equation can be written as

f(x) = x² - 2x + 1 + 4

f(x) = (x - 1)² + 4

Then the domain of the function where the function is decreasing will be (-∞, 1).

Then the correct option is D.

More about the domain and range link is given below.

brainly.com/question/12208715

#SPJ1

4 0
2 years ago
Can someone help me on this
SCORPION-xisa [38]

Step-by-step explanation:

(a) n² + 3

First term = 1² + 3 = 4

Second term = 2² + 3 = 7

Third term = 3² + 3 = 12

Fourth term = 4² + 3 = 19

10th term = 10² + 3 = 103

(b) 2n²

First term = 2(1)² = 2

Second term = 2(2)² = 8

Third term = 2(3)² = 18

Fourth term = 2(4)²= 32

10th term = 2(10)² = 200

Hence, this is the required solution.

5 0
3 years ago
e average distance between Jupiter and the sun is 7.8 × 108 kilometers, and the average distance between the sun and Neptune is
Anarel [89]
The approximate difference between these average distances is 330 kilometers
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