Answer:
The tempature before a tornado is around the 50s. The majority of Tornados form at the dew points around the 50s(there is always exceptions though)
The tempature during a tornado is near freezing.
The tempature after a tornado is can be both hot or cold depends on what tornado.
Discuss the roles of the three spheres of government in a democratic country
Answer search it now it shows best result
Explanation:
How does farming affect the Earth's systems? Choose all the right answers
A. fertilizer runs off the fields and into rivers
B. exhaust from farming machines pollutes the air
C. the land the farm was on cleared away other ecosystems
D. cows give off methane gas that gets in the atmosphere
Answer:
um I think it's C
Explanation:
pls Mark brainiest answerer pls
Which of the is not a characteristic that helps to classify rocks?
Answer:
Where is a pic... Rocks are "earthly" or "organic" you could say.
Explanation:
Which of the following is an accurate statement about the voter turnout rate in the United States?
a. There is usually no difference in participation rates between presidential and midterm elections.
b. Presidential election years usually have significantly higher turnout than in midterm election years
c. Voters are more likely to vote in congressional races in midterms than when presidents are running.
d. More voters turn out to vote in elections where less money is spent to advertise campaigns.
Answer:
c
Explanation:
In semiconductor manufacturing, wet chemical etching is often used to remove silicon from the backs of wafers prior to metallization. The etch rate is an important characteristic of this process and known to follow a normal distribution. Two different etching solutions have been compared using two random samples of 10 wafers for each solution. Assume the variances are equal. The etch rates are as follows (in ml per minute):
Solution 1 Solution 2
9.8 10.4 10.2 10.0
9.4 10.3 10.6 10.2
9.3 10.0 10.7 10.7
9.6 10.3 10.4 10.4
10.2 10.1 10.5 10.3
(a) Calculate the sample mean for solution 1.
(b) Calculate the sample standard deviation for solution 1.
(c) Calculate the sample mean for solution 2.
(d) Calculate the sample standard deviation for solution 2.
(e) Test the hypothesis
H
0
:
m
1
=
m
2
versus
H
1
:
m
1
â
m
2
.
Calculate
t
0
.
(f) Calculate a 95% two-sided confidence interval on the difference in mean etch rate.
Answer:
[tex](a)[/tex] [tex]\bar x_1 = 9.94[/tex]
[tex](b)[/tex] [tex]x_2 = 10.4[/tex]
[tex](c)[/tex] [tex]\sigma_1 = 0.395[/tex]
[tex](d)[/tex] [tex]\sigma_2 = 0.231[/tex]
(e) There is sufficient evidence to reject the claim that the mean etch rate is the same for both solutions
[tex](f)[/tex] [tex]-0.75644 < \mu_1 - \mu_2 < -0.1556[/tex]
Explanation:
Given
Solutions 1 and 2
Solving (a): Mean of solution 1
For Solution 1, we have the following data:
[tex]9.8\ 10.4\ 9.4\ 10.3\ 9.3\ 10.0\ 9.6\ 10.3\ 10.2\ 10.1[/tex]
The sample mean is calculated as:
[tex]\bar x = \frac{\sum x}{n}[/tex]
Where
[tex]n_1 = 10[/tex]
So, we have:
[tex]\bar x_1 = \frac{9.8+ 10.4+ 9.4+ 10.3+ 9.3+ 10.0+ 9.6+ 10.3+ 10.2+ 10.1}{10}[/tex]
[tex]\bar x_1 = \frac{99.4}{10}[/tex]
[tex]\bar x_1 = 9.94[/tex]
Solving (b): Mean of Solution 2
For Solution 1, we have the following data:
[tex]10.2\ 10.0\ 10.6\ 10.2\ 10.7\ 10.7\ 10.4\ 10.4\ 10.5\ 10.3[/tex]
The sample mean is calculated as:
[tex]\bar x = \frac{\sum x}{n}[/tex]
Where
[tex]n_2 = 10[/tex]
So, we have:
[tex]x_2 = \frac{10.2+ 10.0+ 10.6+ 10.2+ 10.7+ 10.7+ 10.4+ 10.4+ 10.5+ 10.3}{10}[/tex]
[tex]x_2 = \frac{104}{10}[/tex]
[tex]x_2 = 10.4[/tex]
Solving (c): Sample Standard Deviation of solution 1
This is calculated as:
[tex]\sigma_1 = \sqrt{\frac{\sum (x-\bar x_1)^2}{n_1-1}}[/tex]
This gives:
[tex]\sigma_1 = \sqrt{\frac{(9.8 - 9.94)^2+ (10.4- 9.94)^2+ (9.4- 9.94)^2+................+ (10.2- 9.94)^2+ (10.1- 9.94)^2}{10 - 1}}[/tex]
[tex]\sigma_1 = \sqrt{\frac{1.404}{9}}[/tex]
[tex]\sigma_1 = \sqrt{0.156}[/tex]
[tex]\sigma_1 = 0.39496835316[/tex]
[tex]\sigma_1 = 0.395[/tex] --- approximated
Solving (d): Sample Standard Deviation of solution 2
This is calculated as:
[tex]\sigma_2 = \sqrt{\frac{\sum (x-\bar x_2)^2}{n_2-1}}[/tex]
So, we have:
[tex]\sigma_2 = \sqrt{\frac{(10.2 - 10.4)^2+ (10.0 - 10.4)^2+ (10.6 - 10.4)^2+ (10.2 - 10.4)^2+.......................+ (10.3 - 10.4)^2}{10-1}}[/tex]
[tex]\sigma_2 = \sqrt{\frac{0.48}{9}}[/tex]
[tex]\sigma_2 = \sqrt{0.05333333333}[/tex]
[tex]\sigma_2 = 0.23094010766[/tex]
[tex]\sigma_2 = 0.231[/tex]
Solving (e): Test the hypothesis
[tex]H_0: \bar x_1 = \bar x_2[/tex]
[tex]H_1: \bar x_1 \ne \bar x_2[/tex]
Start by calculating pooled standard deviation
[tex]s_p = \sqrt{\frac{(n_1 - 1)*\sigma_1^2 + (n_2 - 1)*\sigma_2^2}{n_1 + n_2 -2}[/tex]
[tex]s_p = \sqrt{\frac{(10 - 1)*0.395^2 + (10 - 1)*0.231^2}{10+ 10-2}[/tex]
[tex]s_p = \sqrt{\frac{1.884474}{18}[/tex]
[tex]s_p = \sqrt{0.104693}[/tex]
[tex]s_p = 0.324[/tex]
Calculate test statistic
[tex]t = \frac{\bar x_1 - \bar x_2}{s_p\sqrt{\frac{1}{n_1} + \frac{1}{n_2}}}[/tex]
[tex]t = \frac{9.94 - 10.4}{0.324 * \sqrt{\frac{1}{10} + \frac{1}{10}}}[/tex]
[tex]t = \frac{-0.46}{0.324 * \sqrt{0.2}}[/tex]
[tex]t = \frac{-0.46}{0.324 * 0.4472}[/tex]
[tex]t = \frac{-0.46}{0.1448928}[/tex]
[tex]t = -3.175[/tex]
Calculate the degree of freedom
[tex]df = n_1 + n_2 - 2[/tex]
[tex]df = 10+10 - 2[/tex]
[tex]df = 18[/tex]
The p value is the in the column title of the student t distribution in row 18
[tex]p = 002621[/tex]
The p value is less than the significance level (0.05).
i.e.
[tex]p < 0.05[/tex]
So: Reject the null hypothesis
Solving (f): 95% two-sided confidence interval
[tex]c = 95\%[/tex]
Calculate the degree of freedom
[tex]df = n_1 + n_2 - 2[/tex]
[tex]df = 10+10 - 2[/tex]
[tex]df = 18[/tex]
Calculate [tex]\alpha[/tex]
[tex]\alpha = (1 - c)/2[/tex]
[tex]\alpha = (1 - 95\%)/2[/tex]
[tex]\alpha = (0.05)/2[/tex]
[tex]\alpha = 0.025[/tex]
Using student t distribution
[tex]t_{\alpha/2} = 2.101[/tex]
Calculate margin of error (E)
[tex]E = t_{\alpha/2} * s_p * \sqrt{\frac{1}{n_1} + \frac{1}{n_2}}[/tex]
[tex]E = 2.101 * 0.324 * \sqrt{\frac{1}{10} + \frac{1}{10}}[/tex]
[tex]E = 2.101 * 0.324 * \sqrt{0.2}[/tex]
[tex]E = 0.3044[/tex]
The boundaries of the confidence are:
[tex](\bar x_1 - \bar x_2) -E[/tex] [tex]= (9.94- 10.4) - 0.3044 = -0.7644[/tex]
[tex](\bar x_1 - \bar x_2) + E[/tex] [tex]= (9.94- 10.4) + 0.3044 = -0.1556[/tex]
The confidence interval is:
[tex]-0.75644 < \mu_1 - \mu_2 < -0.1556[/tex]
Why are people are more serious in population management in comparison of previous day ?
Answer:
Because of the rapid growth increase was mainly caused by a decreasing death rate (more rapidly than birth rate), and particularly an increase in average human age.
Explanation:
How has Mexico City's government tried to address its air pollution problem?
A.
It has built water sanitation plants in the city.
B.
It has limited mining in the mountain regions.
C.
It has banned planting trees around the city.
D.
It has restricted the use of automobiles in the city.
Answer:
A.
Explanation:
what is the important reason why students should learn and develop 21st century skills?
Answer:
21st-century skills are more important to students than ever before. They provide a framework for successful learning but also ensure students can thrive in a world where change is consistently occuring and learning never stops.
Most Latin Americans live in big cities. These Urban areas are mostly found where?
A.
Deserts
B.
Mountain Ranges
C.
Forests
D.
Coasts
Answer:
Coasts
Explanation:
People need a water source to live this is why there are more cities in just about any country by the ocean or major rivers. Cities may be in the Mountain Rangers or Forests but that is just a small percentage of cities. (Good example of this is Mexico City it was originally founded on top of a lake)
Which of the following is MOST dependent on the ability to exchange currencies?
A investing in capital goods
B
protecting domestic industries
С
encouraging entrepreneurship
D
engaging in international trade
conflict of motives has nothing to do with frustration true or false
Please help me i need the right answer fast and please dont guess thanks <3
Answer:
The answer to this question is True
which 5 strategies can You employ to ensure that you as a student you will not drop out of university
Answer:
*study
*get motivated
* find friends so you will be less likely to leave
*do something you want to do
*have fun
* go to a university you want to go to
Explanation:
Who wanted Quebec to separate from canada? Please explain in full sentences
Answer:
Answer:
At a federalist rally of about 12,500 people which was held at the Verdun Auditorium on October 24
Explanation:
Charest further emphasized his commitment to constitutional reform if a "No" victory was achieved.
Explanation:
What are the roles and duties of the secretary of the Senate? Check all that apply.
maintaining all Senate documents
ensuring that procedures and rules are followed
setting meeting times for senatorial secessions
keeping a journal of all events that take place in the Senate
assuming the duties of the Senate president in the event of absence, death, or disability
Answer:
maintaining all Senate documents
ensuring that procedures and rules are followed
keeping a journal of all events that take place in the Senate
a b d
Explanation:
PLEASE MARK BRAINLIEST!!!!!!!!!!!!!Answer:
maintaining all Senate documents
ensuring that procedures and rules are followed
keeping a journal of all events that take place in the Senate
how will one adapt from ones post school social routine to minimize the impact that social pressures may have on your academic or work performance,?
Answer:
need points sorry
tell other
Explanation:
ahjajajajajajjajajajajs
2) Who were the main framers of the Constitution of India ?
Answer:
Benegal Narsing Rau I think
How do researchers identify the major problems and functions of the brain? Explain four methods
Answer:
EEG, PET, MRI, and fMRI.
answer I think is most correct gets marked brainly ist
what are the disadvantages of bartering
Answer:
Explanation:
One disadvantage is Lack of Divisibility.
What was Alexander the Great's biggest legacy over the lands he conquered?
Answer:
United the Greek city-states, and Alexander destroyed the Persian Empire forever.
Alexander's conquests spread Greek culture, also known as Hellenism, across his empire.
Explanation:
Which of the following describes how many of the colonies responded after the Boston massacre
Answer:
if these are the answer Boston townspeople attacked and killed five British soldiers.
British soldiers attacked and killed five Boston townspeople.
British soldiers attacked Boston townspeople, who shot five soldiers dead.
Boston townspeople attacked British soldiers, who shot five colonists dead.
Explanation:
then the fourth on
The hyperfocus on crime among athletes is limited to what two sports?
The correct answer to this open question is the following.
Unfortunately, you did attach further context or references.
However, we can comment on the following.
The hyperfocus on crime among athletes is limited to these two sports: football and basketball.
The reason why is that these two sports produce too many "stars" that have too much notoriety for their conduct and behaviors. Some of the athletes that participate in these professional sports got too much attention from the media and the public and are considered famous. This popularity often produces that they lost the ground and act in incongruent ways, many times making the worts decisions that impact their careers by the mistakes they make.
As the public figures they are, their behavior immediately makes the news, and their poor judgment often brings negative consequences to their careers.
What country in asia is located farthest north?
True or False: Disease in the circulatory system does not affect other organ systems, such as the muscular system. *
True
False
Answer:
False
Basic fact:
the circulatory system is a system that contains the heart and the blood vessels and moves blood throughout the body
Explanation:
since it is a heart and blood vessel it moves blood around the body
if there is a disease in there it spreads all around the body through the blood
The territory acquired in the Mexican-American War is called the
Answer:
It ended the war, and Mexico recognized the Mexican Cession, areas not part of disputed Texas but conquered by the U.S. Army. These were northern territories of Alta California and Santa Fe de Nuevo México. ... The question of how to treat the new acquisitions also intensified the debate over slavery in the United States
Explanation:
i hope you understand better
Answer:
its the second drop down
Explanation:
HELP IF U HELP U GET BRAINLIEST ANSWER THIS IS 30 POINTS
Answer:
introducing tax cuts to stimulate the economy
what is one true statement about money ?
Answer:
Explanation:
Answer:
money is a mean of exchange of good and services.
1.money is mobile
2.money is transparent
Based on the maps, why is the population density so low in the western half of China?
What type of government does North Korea have?
QUESTION 4: IMPACT OF UNEMPLOYMENT AND POSSIBLE SOLUTIONS
4.1 Summarise the impact of unemployment using the following headings:
a) Personal impact
b) Social impact
c) Financial impact
Answer:
b)social impact
Explanation:
impact comes with its own social possible solutions