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damaskus [11]
2 years ago
15

A regression was run to determine if there is a relationship between hours of TV watched per day (x) and number of situps a pers

on can do (y). The results of the regression were: y=ax+b a=-1.23 b=22.738 r2=0.748225 r=-0.865 Use this to predict the number of situps a person who watches 3 hours of TV can do (to one decimal place)
Mathematics
1 answer:
tino4ka555 [31]2 years ago
6 0

Answer:

19 situps

Step-by-step explanation:

Given that the regression equation to find a  a relationship between hours of TV watched per day (x) and number of situps a person can do (y) was done.

The result was

y = ax+b

y = -1.23x+22.738\\

Correlation coefficient = 0.865

To predict the number of situps a person who watches 3 hours of TV

y = -1.23(3)+22.738

= 19.048

Approximately 19 situps.

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Both questions plzzz thanks
andrew11 [14]

Answer:

Step-by-step explanation:

The formula for determining simple interest is expressed as

I = PRT/100

Where

I represents interest paid on the loan.

P represents the principal or amount taken as loan

R represents interest rate

T represents the duration of the loan in years.

1) From the information given,

P = cost of gym = $2200

R = 6%

T = 3 years

I = (2200 × 6 × 3)/100 = $395

The total amount that he would pay after 3 years is

2200 + 395 = $2596

If he decides to continue going to the gym, the total amount that the would pay in 3 years(3 × 12 = 36 is

80 × 36 = 2880

Therefore, paying for the gym would cost more. He should take the loan.

2) if she takes the loan, the interest would be

I = (18000 × 7.5 × 5)/100 = $6750

The total amount that she would pay back after 5 years is

6750 + 18000 = $24750

Since the value that would be added to her house is $25000, therefore, she should buy it.

6 0
3 years ago
I need help answering the question in the picture provided
adoni [48]

answer:

(a).

Equation of circle is <u>x²</u><u> </u><u>+</u><u> </u><u>y²</u><u> </u><u>-</u><u> </u><u>2</u><u>5</u><u> </u><u>=</u><u> </u><u>0</u>

(b).

(-5, 0) » yes

(√7, 1) » no

(-3, √21) » no

(0, 7) » no

Step-by-step explanation:

(a).

If centred at origin, centre is (0, 0)

General equation of circle:

{ \boxed{ \bf{ {x}^{2} +  {y}^{2} + 2gx + 2fy   + c = 0}}}

but g and f are 0:

{x}^{2}  +  {y}^{2}   + c = 0 \\ but :  \\ c =  {g}^{2} +  {f}^{2}  -  {r}^{2}  \\ c =  { - 25}

8 0
2 years ago
How to solve for x?
Viktor [21]
Multiply both sides by x so that x will be in the numerator
5 0
3 years ago
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Find the approximate value of the circumference of a circle with the given radius. Use = 3.14. Round your results to one more de
Natali5045456 [20]
C = 2 x 3.14 x 4.6
C = 28.89 

answer 
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5 0
3 years ago
Read 2 more answers
there are 40 students waiting in the line to enter the museum. There are 4 times as many students in the museum as are in line w
JulijaS [17]

9514 1404 393

Answer:

  160

Step-by-step explanation:

The problem statement tells us ...

  (# in museum) = 4 × (# waiting)

  (# in museum) = 4 × 40 . . . . . . . . . . . . the number waiting is 40

  # in museum = 160

6 0
2 years ago
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