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
Rudiy27
3 years ago
6

The head of public safety notices that the average driving speed at a particular intersection averages μ = 35 mph with a standar

d deviation of σ = 7.5 mph. After a school speed limit sign of 20 mph is placed at the intersection, the first 40 cars travel past at an average speed of 32 mph. Using the .01 significance level, was there a significant change in driving speed?
a. Use the five steps of hypothesis testing (report results in APA format).

b. Sketch the distributions involved.

c. Figure the confidence limits for the 99% confidence interval.
Mathematics
1 answer:
tangare [24]3 years ago
7 0
The answer is C because its the only one that makes sense when you see what the question is asking you
You might be interested in
Which is a composite number<br> 81<br> 61<br> 71<br> 41
Ne4ueva [31]

Answer:

81

Step-by-step explanation:

A composite number has factor more than just one and itself.

Factors of 81=

1, 3, 9, 27, 81

4 0
3 years ago
This problem is taken from the delightful book "Problems for Mathematicians, Young and Old" by Paul R. Halmos. Suppose that 681
aleksley [76]

Answer:

680 games

Step-by-step explanation:

Suppose that 681 tennis players want to play an elimination tournament.

1st round:

One of 681 players, chosen at random, sits out that round and 680 players play. There will be 340 winners plus one player which sits - 341 players for the next round and 340 games

2nd round:

There will be 170 winners plus one player which sits - 171 players for the next round and 170 games

3rd round:

There will be 85 winners plus one player which sits - 86 players for the next round and 85 games

4th round:

There will be 43 winners - 43 players for the next round and 43 games

5th round:

There will be 21 winners plus one player which sits - 22 players for the next round and 21 games

6th round:

There will be 11 winners  - 11 players for the next round and 11 games

7th round:

There will be 5 winners plus one player which sits - 6 players for the next round and 5 games

8th round:

There will be 3 winners  - 3 players for the next round and 3 games

9th round:

There will be 1 winner plus one player which sits - 2 players for the next round and 1 game

10th round - final:

1 champion and 1 game.

In total,

340 + 170 + 85 + 43 + 21 + 11 + 5 + 3 + 1 + 1 = 680 games

4 0
3 years ago
If triangle RST = triangle NPQ, then RT is congruent to ?. . a.NP. b.NQ. c.PQ. d.QP
lapo4ka [179]
If the triangles are given to be congruent, the corresponding angles and corresponding sides should have the same measure and lengths. From the given, side RT is congruent to side NQ. Therefore, the answer to the question is letter B. NQ. 
6 0
3 years ago
Phil is riding his bike. He rides 54 miles in 4 hours, 67.5 miles in 5 hours, and 81 miles in 6 hours. Find the constant of prop
AleksandrR [38]

Answer:

K=13,5

y=13,5x, x=numbers of hours

Step-by-step explanation:

To find the  proporcionality constant, divide the number of milles traveled in given time.

K=54/4=67,5/5=81/6=13.5 and the equation that describes the relationship is y=13,5x

3 0
3 years ago
Read 2 more answers
A cylinder has a height of 14 inches and a radius of 5 inches. What is its volume? Use ​ ≈ 3.14 and round your answer to the nea
lianna [129]

Answer:

1099 inches

Step-by-step explanation:

We know that formula for volume of a cylinder is:

V=\pi r^2h

V=\pi 5^2*14

V=\pi 25*14

V=\pi 350

V=3.14*350

V=1099

8 0
3 years ago
Read 2 more answers
Other questions:
  • Find the ordered pairs for the x- and y-intercepts of the equation 5x − 6y = 30 and select the appropriate option below.
    9·2 answers
  • I have 7 different calculus textbooks and 4 different number theory text books. In how many ways can I place the 11 text books o
    11·1 answer
  • Product A is an 8 oz bottle of cough medication that sells for $1.36. Product B is a 16 oz bottle of cough medication that costs
    9·1 answer
  • PLEASE HELP DO QUESTION 5 FOR BRAINLEYIST AWNSER.
    7·1 answer
  • What is the value of x in x/28 = 18/ 72
    13·2 answers
  • A set of exam marks has mean 70 and median 65 marks. It is decided to subtract 10 from all the marks. For the new set of marks,
    15·1 answer
  • A single card is drawn from a standard 52 card deck.
    10·1 answer
  • Can you explain this for me 7-9÷3+6×6×2-4÷2​
    13·1 answer
  • Someone help please want <br> asap
    14·1 answer
  • -6x+6y=9 (1/2,2) please helppppp
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!