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
Elodia [21]
3 years ago
12

The correlation coefficient r between a child’s age, x, and the number of minutes spent doing homework each day, y, is 0.694. Wh

at percent of the variation in the number of minutes doing homework cannot be explained by differences in the children’s ages?
Mathematics
1 answer:
jonny [76]3 years ago
3 0
<span>So, they are looking for the percentage that is NOT explained... Well, given the r we can find the percentage that IS explained by it first. That's given by r^2.

</span>Now - let's take the square of r it gives me .481636. That means that about 48% IS explained. Therefore, the part that cannot be explained must be the missing part (out of 100% <span>so 100% - 48.1636% should be it :)
</span>
<span>So 100% - 48.1636% = 0.518364 and we want to round that off to three decimal places which will give us 0.518... and then we could convert that to a percent for the final. So 0.518 as a percentage is 51.8%! s</span>
You might be interested in
Assume the general population gets an average of 7 hours of sleep per night. You randomly select 45 college students and survey
tekilochka [14]

Answer:

a) ii. This is a left-tailed test.

b) -1.59

c) -1.301

d) i. reject null hypothesis

e) Option i) The data supports the claim that college students get less sleep than the general population.

Step-by-step explanation:

We are given the following in the question:  

Population mean, μ = 7 hours

Sample mean, \bar{x} = 6.87 hours

Sample size, n = 45

Alpha, α = 0.10

Sample standard deviation, s =  0.55 hours

First, we design the null and the alternate hypothesis

H_{0}: \mu = 7\text{ hours}\\H_A: \mu < 7\text{ hours}

a) We use one-tailed(left) t test to perform this hypothesis.

b) Formula:

t_{stat} = \displaystyle\frac{\bar{x} - \mu}{\frac{\sigma}{\sqrt{n}} }

Putting all the values, we have

t_{stat} = \displaystyle\frac{6.87 - 7}{\frac{0.55}{\sqrt{45}} } =-1.59

c) Now,

t_{critical} \text{ at 0.10 level of significance, 44 degree of freedom } = -1.301

Since,                    

t_{stat} < t_{critical}

d) We fail to accept the null hypothesis and reject it.

We accept the alternate hypothesis and conclude that  mean number of hours of sleep for all college students is less than 7 hours.

e) Option i) The data supports the claim that college students get less sleep than the general population.

8 0
3 years ago
Hiii please help i’ll give brainliest if you give a correct answer tysm!
taurus [48]
20 people






Reason - following the sequence
8 0
3 years ago
Plz help! read the instructions and write a proper answer and if you don't i will report you! And the first one to answer right
ahrayia [7]

Answer:

1 = 0.61, 2 = 1.13

Step-by-step explanation:

The first is 25 + 25 + 10 + 1. This is 61 cents which is 0.61 of 1 dollar. The second is 100 + 10 + 1 + 1 + 1. This is equal to 113, 0r 1.13

BRAINLIEST PLEASE

3 0
2 years ago
(13) Encuentra el área de la región sombreada. Si el diámetro tiene 20 pies de longitud (10 ptos). Escribe la respuesta 20p​
mamaluj [8]

Answer:

ok ss

Step-by-step explanation:

4 0
3 years ago
Sinister Stan stole 3 3/4 oz of slime from Messy Molly, but his evil plans require 6 3/8 oz of slime. He stole another 2 3/5 oz
rusak2 [61]

Answer: 1/40

Step-by-step explanation:

Since we are told that Sinister Stan stole 3 3/4 oz of slime from Messy Molly and stole another 2 3/5 oz of slime from Rude Ralph. The total oz of slime stole would be:

= 3 3/4 + 2 3/5

= 3 15/20 + 2 12/20

= 5 27/20

= 6 7/20

We are told that his evil plans require 6 3/8 oz of slime, the amount needed for Sinister Stan for his evil plan would be:

= 6 3/8 - 6 7/20

= 6 30/80 - 6 28/80

= 2/80

= 1/40

6 0
3 years ago
Other questions:
  • 6 cars, 10 trucks, 14 SUV, 15 minivans. If 150 vehicles passed Luann, how many more minivans than cars would you expect to pass
    6·1 answer
  • Simplify 198/726 to the lowest term
    7·1 answer
  • Which fraction is equivalent to negative 2 over 3? 2/- 3, -3 / 2, -2 / -3, 2 / 3
    13·1 answer
  • A jewellery shop sells 240 necklaces a month. 180 of the necklaces were sold via the shops website the rest were sold in a high
    5·1 answer
  • Item 1 A bag contains 7 blue cards, 4 green cards, 6 red cards, and 8 yellow cards. You randomly choose a card. a. How many poss
    10·1 answer
  • The pair of polygons is similar. Find the value of x
    5·1 answer
  • Identify the first operation needed in this equation
    14·1 answer
  • If (1/4)^(x+y) = 256 and log₄(x-y) = 3, what are the exact values of x and y
    14·1 answer
  • 4xpower of 2 + 9 when x = 2
    5·1 answer
  • A stock lost 8 1/4 points on Monday and then another 2 3/4 points on Tuesday. On Wednesday, it gained 12 points.
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!