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
strojnjashka [21]
2 years ago
6

A psychologist is studying how children acquire math skills. She gives the same question to children

Mathematics
1 answer:
ivann1987 [24]2 years ago
7 0

Answer:

D:0.48

Step-by-step explanation:

Hopefully this helps!

You might be interested in
1. using the scale 1 inch=1/2 foot how many feet would be in would be in 26 inches?
Minchanka [31]
The answer is thirteen feet. ^-^
7 0
3 years ago
Sally needs to have some drywall and insulation work done in her house. She has received a quote from a professional drywall con
Leno4ka [110]
It said the correct answer was the contractor 
5 0
3 years ago
Read 2 more answers
A large number of randomized experiments were conducted to determine whether taking a particular drug regularly would decrease t
DENIUS [597]

Answer:

Step-by-step explanation:

b

7 0
3 years ago
Read 2 more answers
The table shows the number of medical clinics and the number of bowling alleys in several cities.
DedPeter [7]

Answer:

Step-by-step explanation:

a) to create a scatter plot for the data, let data for clinics be x and that one for Bowling alleys be y then plot x values with corresponding y values on a graph tool.

<u>x                     y</u>

14                   12

1                      3

6                     6

5                     7

10                    7

6                      8

11                      9

8                      15

6                       7

16                     12

The scatter plot is attached below

b) a cluster is a group of data that is close together. From the plot, the ordered pairs forming a cluster are;

(6,6), (6,7), (5,7), and (6,8)

c) An outlier is a point in a plot which lies very far from the other values. In this case, point its  point (8,15)

d)The linear regression equation is one written in the form of

Y=a+bX where ;

Y=the dependent variable

X=the explanatory variable

a=the intercept, which is the value of y when x=o

b=slope of the line

The formula to apply here is ;

a=(∑y)(∑x²)-(∑x)(∑xy) / n(∑x²)-(∑x)² where n is number of samples

b= n(∑xy)-(∑x)(∑y) / n(∑x²)-(∑x)²

Form a table like below

<u>x                     y               xy               x²                 y²</u>

14                   12              168            196              144

1                      3                 3               1                   9

6                     6                 36            36                 36

5                     7                 35             25                49

10                    7                 70             100              49

6                      8                 48             36              64

11                      9                99             121               81

8                      15               120             64            225

6                       7                42               36              49

16                     12                192            256            144

83                     86              813           871               850------------sum

∑x=83   ∑y=86  ∑xy=813  ∑x²=871  ∑y²=850 and n=10

Applying the formula

a=(∑y)(∑x²)-(∑x)(∑xy) / n(∑x²)-(∑x)²

a=[(86 * 871) - (83*813) ]/ 10 (871-83²)

a=[74906 - 67479] / 10(-6018)

a=[7427] / -60180

a= - 0.1234

b= n(∑xy)-(∑x)(∑y) / n(∑x²)-(∑x)²

b=10(813)-(83*86) / 10 (871)-(83²)

b=[8130-7138] / 8710 -6889

b= 992/1821

b=0.5448

The liner regression equation will be;

Y=a+bX

Y= -0.1234 + 0.5448 X

e) correlation coefficient r is given by;

r= n∑xy - (∑x)(∑y) / √n(∑x²)-(∑x)² × √n(∑y²)-(∑y)²

r=10*813 - (83*86) / √10 *871 -83² ×√10*850 - 86²

r=8130-7138 / √8710-6889 × √8500-7396

r= 992 / (√1821 × √1104)

r=992/ 42.67×33.23

r=992/1417.9

r=0.6996

f) r² is important because it shows you the proportion of the variance of one variable that is predictable from the other variable.

r=0.6996

r²=0.6996² =0.4894

8 0
3 years ago
Read 2 more answers
I WILL MARK BRAINIEST <br> Give the arrow notation for a 270° rotation
Lelechka [254]

Convert from degrees to radians using the ratio  

π/180.  3aπ/2   radians

is this what you need?

or 90 degress

3 0
3 years ago
Other questions:
  • A geologist gathered data about the total shoreline and maximum depth of several area lakes and organized the data into this tab
    9·1 answer
  • What is the percent of change of 24 songs to 78 songs
    9·1 answer
  • PLEASE HELP!!!!!!!!!!!!!!!
    9·1 answer
  • A necklace contains twenty-four spherical beads of silver, each having a radius of 0.5cm. The beads are to be coated, and the co
    13·1 answer
  • In a right triangle one leg measures a quarter of the other, how much do its acute angles measure? with procedure please​
    14·1 answer
  • Round 324 to the nearest 100.
    12·1 answer
  • Alica has 32 stickers .this is 4 times as many as benita has .how many sticker does benita have?
    13·2 answers
  • 1. If a (x) = 3x + 1 and b (x)=√x-4, what is the domain of (b*a) (x)?
    5·1 answer
  • Claire had 4 1/6 feet of string. She used some string to hang out decorations. Now she has 1 5/6 feet of string left. How much s
    12·1 answer
  • Please please pleaseeeeeeeeeeeeeeeeeee I beg of your assistance
    9·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!