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
Who can help with geometry
Kay [80]

Answer:

h = 21.5cm.

Step-by-step explanation:

<em>Step one:</em> Simplify the volume.

220.16 x (pi) = 691.65cm^3.

<em>Step two:</em> Isolate h.

Cylinder volume equation: V = (pi)(r^2)(h), where r is the radius and h is the height.

Divide out the pi and r^2 on both sides to isolate h and move the equation to V/(pi)(r^2) = h.

<em>Step three:</em> Solve for h.

691.65/(pi)(3.2^2) = 21.5cm rounded to the nearest tenths place.

To illustrate this, please check the diagram below.

8 0
3 years ago
find the area of the triangle. please check my answer asap. thank you so much! i need this done in 10 min :( my answer is C:437m
Anon25 [30]

Answer:

C. 437 mm^2

Step-by-step explanation:

Area = 1/2bh

A = 1/2(38*23)

A = 437

7 0
3 years ago
Read 2 more answers
Find the lcm of 8 and 56
nalin [4]
8=8,16,24,32,40,48,and so on
56= 56, 112, 168
6 0
3 years ago
Please answer i will give you braineiest!!! answer 1 2 and 3 i will give you extra 40 points!!!!!!!!!!!!!!!!!!!!!!!
Rama09 [41]

Answer:

Some ages that Mark could possibly be are...

16, 17, 18, 19, and 20. I found my answers because to have a job or work at a program, you have to be at <em>least</em> 16. So Mark could be 16, 17, 18, 19, or 20. He would be able to work being 21 because that is the drinking age and you are already in the adult stage and you are old enough to be responsible with what you do.  

Step-by-step explanation:

<h2><em>Hope this helps and have a great day :)</em></h2>
3 0
3 years ago
How many 3 digit numbers can be made if no digit is repeated and the number can not begin with a zero?
lapo4ka [179]

digit #1 - 9 numbers (1-9)

digit #2 = 9 numbers (0-9 minus the first digit)

digit #3 = 8 numbers ( 0-9 minus the first 2 digits)

9*9*8 = 648 combinations

7 0
3 years ago
Read 2 more answers
Other questions:
  • Help!!!!!!!!!!!!!!!!!
    14·2 answers
  • LAT ONE HELP PLEASE<br> FAST THENK YOU ALL <br> :)))))))))))))))))))))))))))))))
    10·1 answer
  • ANSWER ASAP PLEASE BEING TIMEDDDDDDDD
    11·2 answers
  • For an angle theta with the point (-5, -12) on its terminating side, what is the value of cosine?
    6·2 answers
  • Vicki ordered an enchilada ($2.75), refried beans ($1.75), rice ($.95), and sparkling water ($1.35). Estimate the cost of her me
    12·1 answer
  • Alright im feeling generous and ill give 100 points and brainliest to the person who wins
    7·1 answer
  • Find 70% of 90.<br> plsss tysm
    8·2 answers
  • What is the equation for the line with a slope of -3 that passes through the
    10·1 answer
  • There are 7 red marbles, 7 blue marbles, 7 yellow marbles, and 7 green marbles in a bag. If a person randomly selects 1 marble f
    14·2 answers
  • I need help please as soon as possible
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!