1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Leni [432]
3 years ago
11

In Spring 2017, data was collected from a random selection of STA 2023 students. One of the questions asked how many hours they

had volunteered in the past 24 hours. For the 39 randomly selected upperclassmen, the sample mean was 0.12 and sample standard deviation was 0.42. For the 35 randomly selected underclassmen, the sample mean was 0.34 and the sample standard deviation was 0.87. What is the point estimate of the difference in the population mean volunteered between underclassmen and upperclassmen?
Mathematics
1 answer:
Arte-miy333 [17]3 years ago
5 0

Answer: 0.22

Step-by-step explanation:

We know that the best point estimate for the difference between two population mean is the difference between their sample means.

Given : For the 39 randomly selected upperclassmen, the sample mean was 0.12 and sample standard deviation was 0.42. For the 35 randomly selected underclassmen, the sample mean was 0.34 and the sample standard deviation was 0.87.

Let A denotes the population of upperclassmen and B denotes the population of underclassmen .

\overline{x}_A=0.12

\overline{x}_B=0.34

Then, the point estimate of the difference in the population mean volunteered between underclassmen and upperclassmen will be :-

\overline{x}_B-\overline{x}_A=0.34-0.12=0.22

Hence, the point estimate of the difference in the population mean volunteered between underclassmen and upperclassmen =0.22

You might be interested in
3x 3/5 help me please
ser-zykov [4K]

Answer:

9/5

Step-by-step explanation:

it is because 3/1 × 3×5

so which means 9/5

8 0
2 years ago
Read 2 more answers
Help please n ty :P<br> sdhgfahedgewkgfzndb
Ugo [173]

Answer:

y=-3.2\\\\y=-2.2\\\\y=-1.8

Step-by-step explanation:

Insert the given x values for the given equation to find the corresponding y coordinate:

y=0.2x-2

x:-6,-1,1

Insert -6:

y=0.2(-6)-2

Simplify multiplication (when multiplying a negative and a positive, the result will always be negative):

y=-1.2-2

Simplify (when subtracting from a negative number, add the values, but keep the negative symbol):

y=-3.2

Insert -1:

y=0.2(-1)-2\\\\y=-0.2-2\\\\y=-2.2

Insert 1:

y=0.2(1)-2\\\\y=0.2-2\\\\y=-1.8

:Done

3 0
2 years ago
A donut machine makes small glaze donuts the diameter of each doughnut is 8 cm. What is the circumference of each doughnut creat
kotegsom [21]

Answer:

50.29 cm

Step-by-step explanation:

Given:

Diameter of each doughnut = 8 cm

To find: circumference of each doughnut

Solution:

Circumference refers to the boundary of a geometric figure.

A doughnut has the shape of a circle.

Let r represents the radius of the circle.

Diameter of each doughnut = 8 cm

Radius of each doughnut (r) = Diameter/2

=\frac{8}{2}\\ =4 \,\,cm

Circumference of each doughnut =\pi r^2\\

Put r=4\,\,,\pi=\frac{22}{7}

So, circumference = =\frac{22}{7} (4)^2

=\frac{352}{7} \,\,cm\\=50.29\,\,cm

4 0
3 years ago
Work out giving your answer in its simplest form 3/11 times 4/9
Marina86 [1]

Answer:

3/11 x 4/9 = 4/33 or in decimal form = 0.121212

Step-by-step explanation:

6 0
2 years ago
Read 2 more answers
Fill in the missing numbers to complete the pattern:<br> 2.65, 2.67, ______, ______, 2.73, 2.75
ludmilkaskok [199]
The answers are 2.69 and 2.71
4 0
2 years ago
Read 2 more answers
Other questions:
  • ‏how to convert from octal to decimal​
    10·1 answer
  • Please I need help with this one
    9·1 answer
  • Good Stuff is giving away free pens to each of the first 200 people who come in the store today. In the first hour, they gave aw
    5·2 answers
  • Given that a, b, and c are non-zero real numbers and a + b ≠ 0, solve for x.<br><br> ax + bx - c = 0
    5·2 answers
  • Just one help please
    5·1 answer
  • What number should be added to both sides of the equation to complete the square?
    6·1 answer
  • Which side is adjacent to
    7·1 answer
  • What are different solutions of 1x +2y = 12
    9·2 answers
  • Can any of ya check my answer?
    13·1 answer
  • The perimeter of the garden is 84 feet. The length of one side of fencing is 8 yards. What is the area of the garden?
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!