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
15

Recently, TWA reported an on-time arrival rate of 78.4%. Assume that a later random sample of 750 flights results in 630 that ar

e on time. If TWA were to claim that its on-time arrival rate is now higher than 78.4%, would the claim be supported at the 0.02 level of significance? Please show all 4 steps of the classical approach.
Mathematics
1 answer:
WINSTONCH [101]3 years ago
5 0

Answer:

Step-by-step explanation:

1. Null hypothesis: u <= 0.784

Alternative hypothesis: u > 0.784

2. Find the test statistics: z using the one sample proportion test. First we have to find the standard deviation

Using the formula

sd = √[{P (1-P)}/n]

Where P = 0.84 and n = 750

sd =√[{0.84( 1- 0.84)/750]}

sd=√(0.84 (0.16) /750)

SD =√(0.1344/750)

sd = √0.0001792

sd = 0.013

Then using this we can find z

z = (p - P) / sd

z = (0.84-0.784) / 0.013

z =(0.056/0.013)

z = 4.3077

3. Find the p value and use it to make conclusions...

The p value at 0.02 level of significance for a one tailed test with 4.3077 as z score and using a p value calculator is 0.000008254.

4. Conclusions: the results is significant at 0.02 level of significance suck that we can conclude that its on-time arrival rate is now higher than 78.4%.

You might be interested in
For the diagram below, which equation is the correct use of the distance<br> formula?
photoshop1234 [79]

9514 1404 393

Answer:

  D

Step-by-step explanation:

Any equation that does not have y2 as the first term in the second set of parentheses will be incorrect.

The correct usage is shown in equation D.

3 0
2 years ago
Read 2 more answers
14. Given: 5x + 4y = 24, x + 7y= 11; Prove: y= 1<br> Statements<br> reasons
Semenov [28]

Answer:

Step-by-step explanation:

We can use the process of elimination as

5x + 4y = 24

5(x + 7y = 11) —>          5x + 35y = 55

5x + 4y = 24

-(5x + 35y = 55)

—————————

-31y = -31

-31y/-31 = -31/-31

y=1

4 0
3 years ago
Which expression is not a polynomial
polet [3.4K]
4-x I know this because my teacher just went over this problem
6 0
3 years ago
Solve the following equation <br> 6x-3=4z+9
Pie

Answer:

z=1.5

Step-by-step explanation:

Simplifying

6z + 3 + -4z = 9

Reorder the terms:

3 + 6z + -4z = 9

Combine like terms: 6z + -4z = 2z

3 + 2z = 9

Solving

3 + 2z = 9

Solving for variable 'z'.

Move all terms containing z to the left, all other terms to the right.

Add '-3' to each side of the equation.

3 + -3 + 2z = 9 + -3

Combine like terms: 3 + -3 = 0

0 + 2z = 9 + -3

2z = 9 + -3

Combine like terms: 9 + -3 = 6

2z = 6

Divide each side by '2'.

z = 3

Simplifying

z = 3

8 0
2 years ago
Read 2 more answers
Evaluate 42,147÷63. Round to the nearest whole number, if necessary.
Harman [31]

Answer:

669 is the answer to this equation

Step-by-step explanation:

brainliest?

4 0
3 years ago
Read 2 more answers
Other questions:
  • What is the standard form of 3x+(2-4x)
    13·1 answer
  • What is 5/3 to the second power
    10·2 answers
  • I need the answer plsss
    15·1 answer
  • HELP ASAP!!!!Which function BEST expresses the linear relationship displayed by the scatter plot?
    8·2 answers
  • The bus fare in a city is People who use the bus have the option of purchasing a monthly coupon book for With the coupon​ book,
    11·1 answer
  • Express 5:21/2 in its simplist form​
    13·1 answer
  • I givee brainlilstttt
    9·2 answers
  • Which is the solution to the inequality? cb- 8 15​
    15·1 answer
  • Help me pleaseee
    7·1 answer
  • Line segment st is dilated to create line segment s't' using the dilation rule dq,2.25. point q is the center of dilation. line
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!