To estimate the mean number of text messages sent by cell-phone users, a researcher chooses a location on a college campus in the city and surveys the first 50 people who walk past. These subjects are asked how many text messages they have sent in the past 24 hours. Is it likely that bias will be present in the sample?
A) Because this is a convenience sample, it is likely that the sample results will be unbiased.
B) Because this is a convenience sample of college students, it is likely that bias is present and that the results will overestimate the mean number of text messages sent.
C) Because this is a convenience sample of college students, it is likely that bias is present and that the results will underestimate the mean number of text messages sent.
D) Because this is a voluntary response sample of college students, it is likely that bias is present and that the results will overestimate the mean number of text messages sent.
Answers
Answer:
WARNING! C IS INCORRECT 2021.
MOST LIKELY (B): Because this is a convenience sample of college students, it is likely that bias is present and that the results will overestimate the mean number of text messages sent.
ED2021
Related Questions
An equation is shown below:
4(x − 3) − 5(x + 1) = 3
Which statement shows a correct next step in solving the equation?
The equation can become 4x − 3 − 5x + 1 = 3 by applying the associative property of multiplication.
The equation can become 4x − 3 − 5x + 1 = 3 by applying the distributive property.
The equation can become 4x − 12 − 5x − 5 = 3 by applying the distributive property.
Answers
Answer:
The equation can become 4x − 12 − 5x − 5 = 3 by applying the distributive property.
Step-by-step explanation:
By applying the distributive law to this equation, we can produce the equation :
4x − 12 − 5x − 5 = 3;
The distributive property is a mathematical function in which each element in the parentheses is multiplied by the one outside of it;
4(x − 3) − 5(x + 1) = 3
In the equation;
4 distribute over the first parentheses and -5 over the second one;
So we expand;
4x - 13 - 5x -5 = 3
In distributive property, expansion simply takes place.
Solve the equation for z.
-8z + 1 = z-8
Answers
Answer:
z= 1
Step-by-step explanation:
move the like terms, collect then calculate, divide on both sides :)
Answer:
z equals -1
Step-by-step explanation:
-8z + 1 = z-8
-9z + 1 = -8
-9z + 9
-9z ÷ 9
z = -1
How do I do this problem im confused?
Answers
Answer: 54800
Step-by-step explanation: plug in 6 instead of t in both the equations. Start with the first equation
-300t+150000
-300(6)+150000= 148200
Then do the other equation
500t+200000
500(6)+200000= 20300
Subtract both
203000-148200= 54800
alguma menina de 14 anos no tédio to querendo conhecer gente nova?
Answers
Answer:
Step-by-step explanation:
Oi eu tenho 15 anos
Answer:
OIE tudo bem?
eu tenho 15
5+4(8n-8)=-1+6 for n
Answers
Answer:
n=1
Step-by-step explanation:
5+4(8n-8)=-1+6
5+32n-32=5
5+32n-32=5
-27+32n=5
32n=32
n=1
Answer:
n = 1
Step-by-step explanation:
5 + 4(8n - 8) = -1 + 6
First you have to distribute the 4 leaving the equation to look like this...
5 + 32n - 32 = -1 + 6
Now solve the constants (normal numbers without a variable)
-27 +32n = 5
+27 +27 You have to add 27 to BOTH sides
32n = 32
n = 1
Hope this helps and have a great day!
Solve each of these equations.
3(n+2)=9(6-n)
Answers
Answer:
n= 4
Step-by-step explanation:
3n+6= 54- 9n
12n= 48
n=4
Answer:
4
Step-by-step explanation:
3n+6=54-9n
-3n
6=54-12n
-54
-48=-12n
N=4
WILL MARK BRAINLIEST PLEASE HELP
options are
A. 13
B. 15
C. 26
D. 28
Answers
Answer:
weird it should be 65.5 or the other way around hm
Step-by-step explanation:
or maybe im just dumb
NEED HELP ASAP PLS!!!
A high school club is conducting a cupcake sale at a local fair to raise money for a trip. The club members are baking a total of 444 cupcakes. Each cupcake will sell for 3.00. The display tables cost $75.00 to rent.
Part A:
If n is the Number of cupcakes sold and p is the profit earned, which is the Independent in variable and which is the dependent variable? Explain.
Independent variable:
Dependent variable:
Explain:
Answers
Answer:
independent variable: cupcakes sold
dependent variable: profit earned
explain: no profit earned without cupcakes sold.
Step-by-step explanation:
Answer:
Independent Variable: n = Number of cupcakes sold
Dependent Variable: p = Profit, no profit without the sale of cupcakes
Step-by-step explanation:
Profit depends on the number of cupcakes sold.
Given m|n, find the value of x.
Answers
Answer:
33 degrees
Step-by-step explanation:
Corresponding Angles Postulate
Answer:
33°
Step-by-step explanation:
if m||n then the angle represented with x° and 33° must be equal because these angles are corresponding.
Is the following relation a function?
Answers
Answer:
Step-by-step explanation:
It’s a function
Answer:
yes it is a function
Step-by-step explanation:
since the x values dont repeat itself like there are no two of any of the x values then it is a function
Arrange the four numbers shown in order from least to greatest
6.7%
0.67
6/9
6.7×10-3
Answers
Answer:
Step-by-step explanation:
6.7 x 10 - 3
6.7%
6/9
0.67
In my opinion this should be the answer
-3(5x+2)-(6x-5)
correctly simplify the expression
Answers
Answer:
-21x-11
Step-by-step explanation:
-3(5x+2)-(6x-5)
use distributive property
-15x-6 - 6x-5
put like terms together
-15x-6x-6-5
simplify
-21x-11
hope this helps
You move up 4 units and right 2 units. You end at (-1, 3). Where did you start?
Answers
Answer:
You started at (-3,-1)
Emily plans to put her graduation money into an account and leave it there for 4 years while she goes to college. She receives $750 in graduation money that she puts into an account that earned $127.50 in interest. What was the interest rate that the bank provided
Answers
Answer:
887.40
Step-by-step explanation:
amount = principal(1i)^n
i = .0425/2 = .02125 , n = 8 , principal = 750
amount = 750(1.02125)^8 = 887.40
Which statement must be true to prove j || k?
a.m∠2 + m∠5 = 180
b.∠6 ≅ ∠4
c.∠2 ≅ ∠3
d.∠1 ≅ ∠4
Answers
Answer:
The answer is b. angle 6 must be equal to angle 4.
Martin painted 255 square feet of his kitchen wall with 23 gallon of paint. If he continues coverage at the same rate, how many square feet can he cover with 2 gallons of paint?765 ft2510 ft2382.5 ft21,020 ft2
Answers
Complete Question
Martin painted 255 square feet of his kitchen wall with 2/3 gallon of paint. If he continues coverage at the same rate, how many square feet can he cover with 2 gallons of paint?765 ft2510 ft2382.5 ft21,020 ft
Answer:
765 square ft
Step-by-step explanation:
2/3 gallon of paint = 255 square feet
2 gallons of paint =
Cross Multiply
2 × 255 square feet/2/3 gallon of paint
= 510 ÷ 2/3
= 510 × 3/2
= 765 square feet
Which expression uses the associative property to make it
easier to evaluate 6(1/3•7/5)
O A. (6.1/3)7/5
O B. (6•5/7)1/3
O C. 6(7/5•1/3)
OD 3(1/6•7/5)
Answers
Answer:
A
Step-by-step explanation:
Here, we want to select which of the expressions correctly use the associative property
The associative property deals with rearrangement
So for (a + b) + c
we can have (a + c) + b
In the case of this question, the associate property is the one that makes the evaluation easier
Thus;
we need to bring 1/3 and 6 together since 3 is a factor of 6
We have;
(6•1/3)7/5
answer plss. Money here.
Answers
Answer:
Both angles are equal because they are corresponding so:
2x + 5 = 3x - 7
2x + 12 = 3x
x = 12
Two buses are traveling to a state park. One bus leaves the terminal at 4:00 pm, and travels at 40 miles per hour. The second bus
leaves the terminal at 5:00 p.m. and travels at 60 miles per hour.
At what time does the second bus catch up with the first bus?
Answers
Answer:
Step-by-step explanation:
When the second bus catches up to the first bus, this means that the distance they have travelled is equal.
So for bus 1, you know it travels at 40 miles per hour.
4pm = 0 miles
5pm = 40 miles
6 pm = 80 miles
7pm = 120 miles
For bus 2, you know it travels at 60 miles per hour
5pm = 0 miles
6pm = 60 miles
7pm = 120 miles.
So you can see that at 7pm, they will both have travelled 120 miles.
Help math question 1 ,2 ,3 grade 12
Answers
Answers:
1.
a. 20%
60/300 × 100/100
= ( 60 × 100 / 300 ) × 1/100 = 20/100
Calculator: 60 ÷ 300 × 100
b. 90%
270/300 × 100/100
270/300 × 100/100= ( 270 × 100 / 300 ) × 1/100 = 90/100
Calculator: 270 ÷ 300 × 100
c. 58.33%
175/300 × 100/100
100/100= ( 175 × 100 / 300 ) × 1/100 = 58.33/100
Calculator: 175 ÷ 300 × 100
2.
a. 35 Students
Calculator: 10 × 350 / 100
b. 93
Calculator: 10 × 930 / 100
c. 118
Calculator: 10 × 1180 / 100
d. 1036
Calculator: 10 × 10,360 / 100
3.
a. 11.1 (Repeated)
Calculator: 50 / 450 × 100%
b. 6.67 (6 Repeated)
Calculator: 50 / 750 × 100%
c. 4.167 (6 Repeated)
Calculator: 50 / 1200 × 100%
Hopefully this helps:)
how do I find the value of x so f(x)=7
Answers
Answer:
x=5
Step-by-step explanation:
Here we are given with a graph.
we have been asked to find the value of x for which
As we know that , to find the value of x for the given value of f(x), we need to look onto the vertical axis, and mark a dot on the given value now draw a line perpendicular to vertical axis so that it cut the given straight line, and where they intersect draw another line perpendicular to the horizontal axis and you will get the value where it crosses the horizontal axis.
Hence we get x=5, then f(x)=7.
BRAINIEST IF RIGHT George and his dad are planning to attend the state fair. An adult ticket is $19.00. The price of an adult ticket is one third the price of a student ticket plus $15.00. Write an equation to determine how much George will pay for a student ticket.
A one thirdx + 19 = 15
B one thirdx + 15 = 19
C one thirdx − 19 = 15
D one thirdx − 15 = 19
Answers
Answer:
1/3x+15=19
Step-by-step explanation:
so B
Answer:
its b
Step-by-step explanation:
you dont know the price if the student tick so it represents x... one third of a student ticket would be one thirdx. after you do that you will have to add the extra 15 dollars to it in order to get the price if 19 dollars per adult ticket.
Question 4
2 pts
If a = -3, b = 2 and c = -4 find the value of the expression.
a2 +b²
Answers
Answer:
-2
Step-by-step explanation:
Order of Operations: BPEMDAS
Step 1: Define
a2 + b²
a = -3
b = 2
c = -4
Step 2: Substitute and Evaluate
2(-3) + 2²
-6 + 4
-2
Answer:
1
Step-by-step explanation:
9)
If l||m and jik,
find the value of y.
(6y + 7)°
1
(5x)
(7x + 24°
m
k
A 7
B) 13
C) 18
D) 65
jump roping
spinning in circles
eating gummy bears
finger painting
Answers
9514 1404 393
Answer:
C) 18 eating gummy bears
Step-by-step explanation:
The angles indicated with x-expressions are supplementary, so we have ...
(5x) +(7x+24) = 180
12x +24 = 180 . . . collect terms
x +2 = 15 . . . . . . divide by 12
x = 13 . . . . . . . . . subtract 2
Then the obtuse angle is ...
7x +24 = 7(13) +24 = 115
__
The angle marked with a y-expression is a corresponding angle to this, so has the same measure.
6y +7 = 115
6y = 108 . . . . subtract 7; next divide by 6
y = 18
Answer:
y=18
Step-by-step explanation:
5x+7x+24=180
12x+24=180
12x=156
x=13
6y+7+65=180
6y+72=180
6y=108
y=
the sum of two nubers is 20. the difference between three times the first number and twice the sencond is 40. find the two numbers.
Answers
Which represents the solution set to the inequality 5.1(3 + 2.2x) > –14.25 – 6(1.7x + 4)?
Answers
Answer:
The answer is x > -2.5 or (-2.5,infinity)
Step-by-step explanation:
1. To participate in a school trip, Kim had to earn $85 in one week. Kim could earn $8 per
hour babysitting and $15 per hour for yard work, but Kim's parents limit work time to 8
hours per week. How many hours should she spend doing each type of work?
a
First define your variables.
b. Write two equations, one that represents the condition on the total number of hours to be
worked and the other which relates the number of hours worked at each job towards her
goal.
Answers
Task: 4 2/3 yards = ? feet
whats the rule
Answers
Answer:
4 2/3 yards = 14 feet
Step-by-step explanation:
1 yard = 3 feet
A snail can move approximately 0.30 meters per minute. How many meters can the snail cover in 20 minutes?
Answers
Answer:
6
Step-by-step explanation:
0.30
x 20
6
Can you please help me solve this and show the solution 4y⁴+6y?
Answers
Answer:
4y^4 + 6y = 256y + 6 = 262y
Step-by-step explanation:
Remove the variables for a second and think of the problem as a normal expression; 4^4 + 6
Simplify the first term; 4^4 = 256
Now, add 6; 256 + 6 = 262
Add back in the variable; 262y
Answer:
2y(2y+3)
Step-by-step explanation:
2y(2y) +6y factor 2y out of 4y^2
2y(2y)+2y(3) factor 2y out of 6y
2y(2y + 3) factor 2y out of 2y(2y)+2y(3)