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xenn [34]
3 years ago
10

A professor wanted to determine the proportion of students in his class who have cheated on an exam. The professor selects a ran

dom sample of 30 students from his class and emails them the question "Have you ever cheated on an exam?". He receives responses from 10 of the 30 students. Which of the following statements are true?
Select all that apply.
Select one or more:

a. This study would suffer from undercoverage because the professor should have selected a sample from the entire student body of the university.
b. This study suffers from non-response bias because only 33% of the people surveyed provided a response.
c. This study suffers from response bias since students will not want to tell a professor whether or not they have cheated.
d. The study should not suffer from any bias since it was based on a random sample.
Mathematics
1 answer:
mr_godi [17]3 years ago
8 0

Answer:

Options B and C are correct.

Step-by-step explanation:

The professor selects a random sample of 30 students from his class and emails them the question "Have you ever cheated on an exam?".

He receives responses from 10 of the 30 students.

The following statements are true here:

B: This study suffers from non-response bias because only 33% of the people surveyed provided a response.  

C: This study suffers from response bias since students will not want to tell a professor whether or not they have cheated.

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Zane performs the elementary row operation represented by R2-½R1 on matrix A.​
UkoKoshka [18]

Answer:

[2 5 0]

[-7 -11/2 12]

Step-by-step explanation:

We want to perform elementary row operation represented by R2 - ½R1 on matrix A in the figure attached.

Now, matrix A is given as;

[2 5 0]

[-6 -3 12]

Now, R1 is row 1 = [2 5 0]

R2 is row 2 = [-6 -3 12]

Thus, R2 - ½R1 = [-6 -3 12] - ½[2 5 0]

This gives;

[-6 -3 12] - [1 5/2 0] = [-7 -11/2 12]

Now,[-7 -11/2 12] will be the new row 2 since it's just an elementary row operation we did on the Matrix A.

Thus, the new matrix is now;

[2 5 0]

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5 0
3 years ago
Read 2 more answers
Having a small brain moment, can you please help and show work
ankoles [38]

Answer:

The value if x is 0.9875.

Step-by-step explanation:

First, we have to get rid of brackets by expanding :

0.5(2x +  \frac{3}{4} ) -  \frac{1}{3} (0.1 + x) = 1

0.5(2x) + 0.5( \frac{3}{4} ) -  \frac{1}{3} (0.1) -  \frac{1}{3} (x) = 1

x +  \frac{3}{8}  -  \frac{1}{30}   -   \frac{1}{3} x = 1

Next you have to collect like terms :

x  -  \frac{1}{3} x +  \frac{3}{8}  -  \frac{1}{30}  = 1

\frac{2}{3} x +  \frac{41}{120}  = 1

Lastly, you can solve x :

\frac{2}{3} x = 1 -  \frac{41}{120}

\frac{2}{3} x =  \frac{79}{120}

x =  \frac{79}{120}  \div  \frac{2}{3}

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8 0
3 years ago
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Lapatulllka [165]

Answer:

212 more student voted musical than drama .

Step-by-step explanation:

As given

In choosing this year 327 voted musical and 115 voted drama.

More students voted musical than drama = Total students voted for musical - Students voted for drama .

Putting values in the above

More students voted musical than drama = 327- 115

                                                                      = 212

Therefore 212 more student voted musical than drama .

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vlada-n [284]

Answer:

A. 1/8

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m = (-5- - 4)/(1-9)

m = (-5+4)/(-8)

m = (-1)/(-8)

m = 1/8

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3 years ago
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Let f(x)=2x+2 and g(x)=x^2<br> State the domain of the operation:<br> h(g(x))
faust18 [17]

Answer: the domain of f(x)=2x+2 is all real numbers and the domain of g(x)=x^2 is (0, infinity)

Step-by-step explanation:

there is no horizontal asymptote given

7 0
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