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
algol [13]
2 years ago
15

A researcher who wants to test the hypothesis that the population mean of a variable is 85, takes a sample of 50 people and obta

ins a sample mean of 81. A hypothesis test finds that the sample mean is not significantly different from the hypothesized population mean at 5% level of significance. What could be a 95% confidence interval for the population mean?
Mathematics
1 answer:
zhenek [66]2 years ago
5 0

Answer:

CI = (  28,28  - 1,96*σ ;  28,28 + 1,96*σ )

Step-by-step explanation:

Population mean      μ₀  = 85

Sample size   n  =  50

Sample mean   μ  = 81

Significance Level     α = 5 %    α  =  0,05

From Hypothesis Test

Null Hypothesis                         H₀         μ    =    μ₀

Alternative Hypothesis             Hₐ         μ    ≠   μ₀  

After a two taio-test was found no significative difference about the mean

Then  α/2  =  0,05/2   α/2 = 0,025

CI = 95 %     CI = 0,95

From z-table

z(c) = (±) 1,96

CI =  (  μ -  μ₀ ) ± z(c) * σ/√50

CI =  (  85 - 81 )*√50  ± 1,96 *σ

CI =  4*7,07   ± 1,96*σ

CI  =  (  4*7,07  - 1,96*σ ;   4*7,07  + 1,96*σ )

CI = (  28,28  - 1,96*σ ;  28,28 + 1,96*σ )

You might be interested in
Veronica's fall football league has a phone tree in case games or practices are postponed. The coach calls 3 players. Then, each
zepelin [54]

Answer:

39

Step-by-step explanation:

the first three call 3, making it 3*3, then each of them will get 3 more, making it 3+(3*3)+(3*3*3),3+9+27, 39

7 0
3 years ago
Read 2 more answers
Imani would like to approximate the number of students in her school with part time jobs . She surveys the 28 students in her ma
sladkih [1.3K]
Biased, because there is only survey of one group of people (one grade, one class). The sample (the class) is too small compared to the population (assuming it’s an average school size). You will end up with less than 1 percent of the population size thus the survey is not reliable information.
6 0
3 years ago
Colin was thinking of a number. Colin subtracts 5 from it and gets an answer of 10.7. What was the original number?
Gemiola [76]

Answer:

15.7

Step-by-step explanation:

10.7 + 5 = 15.7

ovjiyxyrasyrcgihuzyigddhc

8 0
2 years ago
What’s x Pythagorean triples
nadezda [96]
We have to find x and x is the hypotenuse. We use this formula:

hyp²=side²+side²

So:

hyp²=side²+side²

hyp²= 12²+9²

hyp²= 225

hyp²= √225

hyp= 15

Therefore, the hypotenuse is 15 and x is 15.
HOPE THIS HELPS!
HAVE A GR8 EVENING ;-)

6 0
3 years ago
The scale on map is 1:500000
Arada [10]

Answer:

3,500 km

Step-by-step explanation:

Assuming that 1:500000 is meters you would have to convert to kilometers.

7 * 500000 / 1000 = 3500

5 0
3 years ago
Other questions:
  • you borrow $200 from a friend to help pay for a new laptop computer. You pay your friend back $12per week. Write and solve an in
    15·1 answer
  • Question is in the picture
    11·1 answer
  • One factor of One factor of f(x)=5x^3+5x^2-170x + 280 is (x +
    11·2 answers
  • 31 Two identical umber cubes are shown in the picture. The edge length of these number cubes was the combined volume of the two
    8·1 answer
  • There are 3 blue marbles, 6 red marbles, 2 green marbles and 1 black marble in a bag. You choose a marble, REPLACE it, and choos
    13·2 answers
  • Find each value or measure. Assume that segments that appear to be tangent are tangent.
    5·1 answer
  • Write the expression in standard form. 28m ÷ 7m​
    14·1 answer
  • Learning Task No. 1
    12·1 answer
  • Arrange the following numbers in ascending order.<br><br> 2.01, 2.0015, 2.10, -2.00, -2.20
    15·1 answer
  • <img src="https://tex.z-dn.net/?f=%5Cfrac%7B1%7D%7B10%7D%20%2B%5Cfrac%7B7%7D%7B10%7D" id="TexFormula1" title="\frac{1}{10} +\fra
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!