Researchers used two footballs of the same size to examine the effect of helium on kicking distance. One football was filled with air, and the other was filled with helium. Eleven people participated in the study. Eacn person kicked the football filled with air and the football filled with helium, and the kicking distances, in y were recorded. The football that was kicked first was determined by the flip of a fair coin, know which football was filled with air and which was filled with helium. What tyne ot the researchers and, of the following. which is the appropriate 1-interval for in 4. ards, the people did not hat type of study was conducted by ference?

(A) A completely randomized design and a t-interval for a difference between means for independent samples
(B) A completely randomized design and a r-interval for a mean difference
C) A matched-pairs design and a -interval for a difference between means for independent samples
(D) A matched-pairs design and a -interval for a mean difference
(E)-An observational study and a f-interval for a difference between means for independent samples

percentage - 25%

probability - 0.25

we know,

total amount of students in class = 20

total boys = 10

total girls = 10

no of girls who wear glasses = 10/2 = 5

probability of choosing a girl with glasses is =

number of girls wearing glasses/total number of students in the class = 5/20

thus, percentage of selecting a girl wearing glasses will be

= 5/20 × 100

= 5 × 5

25%

therefore,

probability will be 0.25

happy to

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step-by-step explanation:

the true statements are:

r = set of real numbers

n = set of natural numbers, 1,2,

w = n u{0} = {0,1,}

d is the only accurate one

step-by-step explanation:

the answer would be d.

step-by-step explanation:

move all variables to the left side and all constants to the right side

(x−3)^2+(y−1)^2=16

this is the form of a circle. use this form to determine the center and radius of the circle.

( x − h ) 2 + ( y − k ) 2 = r 2

match the values in this circle to those of the standard form. the variable   r   represents the radius of the circle,   h   represents the x-offset from the origin, and   k   represents the y-offset from origin.

r = 4

h = 3

k = 1

the center of the circle is found at   ( h , k ) .

center:   ( 3 , 1 )

these values represent the important values for graphing and analyzing a circle.

center:   ( 3 , 1 ).

radius:   4