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kolbaska11 [484]
4 years ago
9

(Please Help) A small city conducts a survey to determine how its residents feel about building a public pool facility. Research

ers go door-to-door one day from 9:00 a.m. to 5:00 p.m. to ask if the adult resident would like to complete the survey. What kind of sampling technique is being used? Against which group would the survey most likely be biased?
A. Systematic sampling; the sample would be biased against adults who are unemployed.
B. Volunteer sampling; the sample would be biased towards those who complete the survey.
C. Simple random sampling; the sample would be unbiased.
D. Convenience sampling; the sample would be biased against adults who work during the day.
Mathematics
2 answers:
alekssr [168]4 years ago
5 0

Answer:

D- convenience sampling, the sample would be biased against adults who work during the day

Step-by-step explanation:


sergejj [24]4 years ago
4 0

Answer:

D. Convenience sampling; the sample would be biased against adults who work during the day.

Step-by-step explanation:

Many adults work a typical 9-5 job, therefore if the survey goes on during their full shift, none of them will get to answer. Most people who answer the survey will either be unemployed, or work at night, and no adult with a day job will get to voice their opinion.

please mark brainliest

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A. 15<br> B. 35<br> C. 25<br> D. 45
kicyunya [14]

Answer:

C. 25

Step-by-step explanation:

132= (5x+7)

-7 -7

125=5x

______

5x 5x

25=x

6 0
3 years ago
Can a function be concave down and positive everywhere?
aivan3 [116]
<span>Can a function be concave down and positive everywhere?
can be a semicircle
example, y=4+\sqrt{4-x^2}
attachment 1

Can a function be increasing and be concave down everywhere?
no, concave down means increase slope then decrease slope

Can a function have two local extrema and three inflection points?
inflection points are where the concavity changes
it can be at the ends, the middle and the other end
like in atachment 2, the circles are inflection points

Can a function have 4 zeros and two local extrema?
no, as you can see in attachment 3, there can be 3 zeroes at most for 2 local extrema
</span>
8 0
3 years ago
Question <br> 7 - (-3)=<br> PLEASE HELP ME!!!
Roman55 [17]

Answer:

10

Step-by-step explanation:

7-(-3)

=7+3

=10

Hope this is helpful

7 0
3 years ago
Read 2 more answers
Solve k^2 + 13k + 30 = 0
kogti [31]
K² + 13k + 30 = 0

This is a quadratic equation. Let's attempt solving it by factorization.

Coefficient of k² = 1, last term = 30

Multiply these two together 1*30 = 30

We think of two numbers that multiply to give 30 and add to give the middle term 13.

The two numbers are 3 and 10.

3*10 = 30,   3 + 10 = 13.

we replace the 13k with 3k + 10k

 k² + 13k + 30 = 0

k² + 3k + 10k + 30 = 0

k(k + 3) + 10(k + 3) = 0

(k + 3)(k + 10) = 0

(k + 3) = 0 or  (k + 10) = 0

k = 0 - 3  or  k = 0 - 10

k = -3, or -10

I hope this helps.
4 0
4 years ago
Which statement best describes the association between variable X and variable Y?
Maksim231197 [3]

Answer:

Perfect positive association

Step-by-step explanation:

Definition: A perfect positive association means that a relationship appears to exist between two variables, and that relationship is positive 100% of the time. Two variables have a positive association when the values of one variable tend to increase as the values of the other variable increase. (+1 indicates a perfect positive linear relationship)

Definition: A perfect negative association means that a relationship appears to exist between two variables, and that relationship is negative 100% of the time. Two variables have negative association when the values of one variable tend to decrease as the values of the other variable increase. (-1 indicates a perfect negative linear relationship)

Values between 0.3 and 0.7 (-0.3 and -0.7) indicate a moderate positive (negative) linear relationship.

From the graph we can see that this relationship shows perfect positive association (both variables increase and we can plot the straight line which will include all points)

3 0
4 years ago
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