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
dlinn [17]
3 years ago
11

A research team is testing whether a fuel aditive increases a car's gas mileage. The maker of the additive claims that the addit

ive will increase a car's gas mileage by at least 6 mpg. Among 25 cars that were treated with the additive, the average increase in mileage was 5.3 mpg with a standard deviation of 1.8 mpg. The research team found the z-score to be -1.94. Is there enough evidence to reject the company's evidence?
Mathematics
1 answer:
Thepotemich [5.8K]3 years ago
5 0

Answer:

Yes  there is sufficient evidence to  reject the company's evidence

Step-by-step explanation:

From the question we are told that  

   The sample size is  n =  25

    The mean is  \= x = 5.3 \ mpg

     The standard deviation is  \sigma = 1.8 \  mpg

    The z-score is  z = -1.94

The null hypothesis is  H_o : \mu = 6 \ mpg

The alternative hypothesis is  H_a :  \mu \ne 6

 Generally the p-value is mathematically evaluated as  

           p-value   =  2 * P( Z

From the z table  the area under the normal curve to the left corresponding to    -1.94  is

         P( Z

=>  p-value   =  2 * 0.02619

=>  p-value   =  0.052

Let assume the level of significance is  \alpha = 0.05

 Hence the  p-value > \alpha this mean that

   The  decision rule is  

Fail to reject the null hypothesis

The conclusion is

 There is sufficient evidence to  reject the company's evidence

 

You might be interested in
Simplify the expression -3(10x + 4y) + 6(6x − 2y)
IgorC [24]
-30x-12y+36x-12y

Combine the x' s first

6x-12y-12y

Combine the y's

6x-24y is your answer
4 0
3 years ago
Read 2 more answers
Simplify 7 sqare root 3 takeaway 2 sqare root 3 add sqaure root 3 takeaway 3 sqaure root 3
Paha777 [63]

Answer:

tel:+18446450594

Step-by-step explanation:

8 0
2 years ago
Which unit would you use to measure the height of a birds
Mkey [24]
I think that inches would be most common for height but centimeters and feet could also be used.
3 0
3 years ago
Explain why the slope of a horizontal line is always zero
Monica [59]

The slope of a line is always zero because the line does not move up or down on the y-axis.

5 0
2 years ago
Read 2 more answers
Examine the intersection of these two lines:
Olin [163]

Answer:

b c d e

Step-by-step explanation:

8 0
2 years ago
Other questions:
  • find each comission, given the sale and the comission rate 1. $2,500, 8% 2. $ 2,00, 7.5% 3. $600, 4.5%
    12·2 answers
  • Which system of linear inequalities is graphed?
    11·2 answers
  • ali wants to buy a piano the piano measures 19/4 feet long she has a space 5 feet long for the paino in her house. does she have
    10·1 answer
  • Mary has 5/6 marbles that are striped and 1/6 marbles that are solid color. If Mary has 10 stiped marbles, how many marbles does
    5·1 answer
  • NEED ANSWER NOW..NEED CORRECT ANSWER WILL MARK BRAINLIEST..
    14·2 answers
  • Find the slope of the line.
    9·1 answer
  • Washington Middle School is hosting a pancake breakfast fundraiser to raise money for a new outdoor field area. They will be org
    13·2 answers
  • ░░ ░░░░▄░░░░░░░░░ ▄ ░░░░░░░░▌▒█░░░░░░░░░░░▄▀▒▌ ░░░░░░░░▌▒▒█░░░░░░░░▄▀▒▒▒▐ ░░░░░░░▐▄▀▒▒▀▀▀▀▄▄▄▀▒▒▒▒▒▐ ░░░░░▄▄▀▒░▒▒▒▒▒▒▒▒▒█▒▒▄█▒▐
    9·2 answers
  • A = LW<br> L = 50<br> W = 15<br> Give your answer in simplest form.<br> Enter
    8·1 answer
  • Find the distance between the points (-6,-4) and (-6,-18)
    15·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!