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
Anit [1.1K]
3 years ago
8

It is claimed that an automobile is driven on the average more than 20,000 kilometers per year. To this claim, a random sample o

f 20 automobile owners is asked to keep a record of the kilometers they travel. Would you agree with the claim if the random sample showed an average of 23,500 kilometers and standard deviation of 3900 kilometers? Use alpha = 5%.
Mathematics
1 answer:
Aleonysh [2.5K]3 years ago
3 0

Answer:

Kindly check explanation

Step-by-step explanation:

Given the following :

Sample mean(x) = 23500

Sample standard deviation (sd) = 3900

Sample size (n) = 20

Population mean (m) = 20,000

Null hypothesis : m = 20000

H1: m > 20000

To obtain the z-score :

(population mean - sample mean) / (sample standard deviation /√sample size)

(x - m) / (sd/√n)

(23500 - 20000) / (3900 / √20)

3500 / (3900 /4.4721359)

3500 / 872.06651

= 4.0134

Get the P value to know if to reject or accept the null:

P(z > 4.0134) = 1 - P(z < 4.0134)

P(z < 4.0134) = 1

1 - P(z < 4.0134) = 1 - 1 =0

Since P value is < alpha, we reject the null.

Hence average is > 20000

You might be interested in
Subtract -1/2n - (-1/2n)
9966 [12]
Answer: 0
Explanation:
-1/2n -(-1/2n)
= -1/2n + 1/2n
= 0
8 0
3 years ago
A student is painting a room at a constant rate. She is able to paint 2/5 of a room in 1/2 of an hour. How long does it take to
MrMuchimi

Answer:

75 minutes

Step-by-step explanation:

if it takes 30 minutes to paint 2/5 of the room, then it must take 15 minutes to paint 1/5 of the room.

15 * 5 = 75 minutes or 5/4 hours

7 0
3 years ago
Write the decimal expansion for
inysia [295]

Answer:

B. 0.54

Step-by-step explanation:

7 0
3 years ago
Read 2 more answers
What is 8/90 in simplest form
STALIN [3.7K]
8/90 in simplest form is 4/45
3 0
3 years ago
Read 2 more answers
Suppose that the population of deer in a state is 1,500 and is growing 2% each year. Predict the population after 4 years.
frutty [35]
Required number
= 1500*(1+2%)^4
=1624(cor.to.the nearest integer)
7 0
2 years ago
Other questions:
  • Which statement is true about parallel lines?
    6·2 answers
  • What is the slope of the line shown below?
    10·2 answers
  • Angles 1 and 2 are complementary and congruent. what is the measure of angle 1? 30° 45° 50° 75°
    9·2 answers
  • What is the solution for s in A=ys+y
    8·1 answer
  • What is the answer to this equation
    15·1 answer
  • What is the correct plural form of "una bebida popular"?
    15·2 answers
  • F(x). = x3+2x2+9x+18 find all zeros and use synthetic division
    13·1 answer
  • Write the word sentence as an equation.
    11·2 answers
  • Write an equation of the line that passes through (18,2) and is parallel to the line 3y - x= - 12 .
    15·1 answer
  • Please Help Fast This Is Important.
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!