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
Finger [1]
3 years ago
14

Student researchers Haley, Jeff, and Nathan saw an article on the Internet claiming that the average vertical jump for teens was

15 inches. They wondered if the average vertical jump of students at their school differed from 15 inches, so they obtained a list of student names and selected a random sample of 20 students. After contacting these students several times, they finally convinced them to allow their vertical jumps to be measured. Here are the data (in inches): 11.0 11.5 12.5 26.5 15.0 12.5 22.0 15.0 13.5 12.0 23.0 19.0 15.5 21.0 12.5 23.0 20.0 8.5 25.5 20.5 A visual of the data distribution is below: Do these data provide convincing evidence at the α = 0.10 level that the average vertical jump of students at this school differs from 15 inches?
Mathematics
1 answer:
abruzzese [7]3 years ago
7 0

Answer:

There is no convincing evidence at α = 0.10 level that the average vertical jump of students at this school differs from 15 inches.

Step-by-step explanation:

We have to make a hypothesis test to prove the claim that the average vertical jump of students differs from 15 inches.

The null and alternative hypothesis are:

H_0: \mu=15\\\\H_a: \mu\neq15

The significance level is 0.10.

The sample mean is 17 and the sample standard deviation is 5.37.

The degrees of freedom are df=(20-1)=19.

The t-statistic is:

t_{19}=\frac{M-\mu}{s_M/\sqrt{n}} =\frac{17-15}{5.37/\sqrt{20}}=\frac{2}{5.37/4.47} =2/1.20=1.67

The two-sided P-value for t=1.67 is P=0.11132.

This P-value is bigger than the significance level, so the effect is not significant. The null hypothesis can not be rejected.

There is no convincing evidence at α = 0.10 level that the average vertical jump of students at this school differs from 15 inches.

You might be interested in
(x - 1)-+ x (1 - x)<br>-<br>-(1+x)<br>--x-1<br>is it correct?<br>​
77julia77 [94]
Ya i think that it would bee
8 0
3 years ago
Read 2 more answers
I really need helppppp
Dmitry [639]

Answer: the distance of the boat from the foot of the lighthouse is 290.5 feet.

Step-by-step explanation:

The right angle triangle ABC representing the scenario is shown in the attached photo.

Angle A is alternate to the angle of depression, hence, they are the same.

The height of the lighthouse represents the opposite side of the right angle triangle. The distance, x of the boat from the foot of the lighthouse represents the adjacent side of the right angle triangle.

To determine x, we would apply

the tangent trigonometric ratio.

Tan θ, = opposite side/adjacent side. Therefore,

Tan 11.1 = 57/x

x = 57/Tan 11.1 = 57/0.1962

x = 290.5 feet to the nearest tenth.

6 0
3 years ago
Devon paid for 4 pounds of bananas with a $10 bill. He got back $4.00. What was the cost of 1 pound of bananas? $3.50 $24.00 $1.
Maksim231197 [3]

Answer:

24.00

Step-by-step explanation:

3 0
3 years ago
What is the rate of change for 2y+3=3x
Elenna [48]
The rate of change in z at (4,9) as we change x but hold y fixed is = 3/[2sqrt(3x+2y)] put x = 4 , y = 9 = 3/[2sqrt(12+18) = 3/[2sqrt(30)] The rate of change in z at (4,9) as we change y but hold x fixed is = 1/sqrt(3x+2y) put x = 4, y =9 = 1/sqrt(30)
5 0
3 years ago
Show your work &lt;------<br> *PLEASE HELP I'LL GIVE BRAINLIEST YOU HAVE TO SHOW WORK THO*
aniked [119]

Answer:

N = 10

Step-by-step explanation:

4^10=4^n

after that just simplify

:)

Hope this helps!

7 0
3 years ago
Read 2 more answers
Other questions:
  • Let C = C1 + C2 where C1 is the quarter circle x^2+y^2=4, z=0,from (0,2,0) to (2,0,0), and where C2 is the line segment from (2,
    13·1 answer
  • A strip of wood 66 inches long is to be cut into 51 /2 -inch pieces. How many pieces can be cut? A. 12 B. 14 C. 30 D. 33
    14·1 answer
  • when 1770 is divided into 14 equal parts, the remainder is 6. what is the correct way to write th quotient
    14·1 answer
  • Write 42 and 63 as a product of their prime factors
    10·1 answer
  • When a ________contains only numbers and at least<br> one operation it is called a _________.
    9·1 answer
  • What i 5 + 5<br> ok<br> ok<br> ko
    9·2 answers
  • Can someone help me with this question
    6·1 answer
  • HELPPP FOR BRAINLEST!!!
    7·2 answers
  • Which expression represents the area of the base of the pyramid? startfraction 3 v over h endfraction units2 (3v – h) units2 (v
    8·1 answer
  • What is the graph that represents the equation 0.4(x + 3) = (y - 6)²?
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!