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Citrus2011 [14]
3 years ago
10

0.0028 in standard form

Mathematics
1 answer:
steposvetlana [31]3 years ago
4 0

Answer: 2.8 x 10^-3

Step-by-step explanation: Because 10^-3 moves the decimal backwards 3 times

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You are given the following data, where X1 (final percentage in history class) and X2 (number of absences) are used to predict Y
vaieri [72.5K]

Answer:

Step-by-step explanation:

Hello!

Given the variables

Y: standardized history test score in third grade.

X₁: final percentage in history class.

X₂: number of absences per student.

<em>Determine the following multiple regression values.</em>

I've estimated the multiple regression equation using statistics software:

^Y= a + b₁X₁ + b₂X₂

a= 118.68

b₁= 3.61

b₂= -3.61

^Y= 118.68 + 3.61X₁ - 3.61X₂

ANOVA Regression model:

Sum of Square:

SS regression: 25653.86

SS Total: 36819.23

F-ratio: 11.49

p-value: 0.0026

Se²= MMError= 1116.54

Hypothesis for the number of absences:

H₀: β₂=0

H₁: β₂≠0

Assuming α:0.05

p-value: 0.4645

The p-value is greater than the significance level, the decision is to not reject the null hypothesis. Then at 5% significance level, there is no evidence to reject the null hypothesis. You can conclude that there is no modification of the test score every time the number of absences increases one unit.

I hope this helps!

5 0
3 years ago
Pls help if you can Thx!
N76 [4]

GIVEN:

Cost of a taco and a cup of tea = $2.10

  • x + y = 2.10 ...(1)

Cost of 2 tacos and 3 cup of tea = $5.15

  • 2x + 3y = 5.15 ...(2)

ANSWER:

On solving eq(1), we get

  • x = 2.10 – y

Substitute the value of x in eq(2), we get

  • 2(2.10 – y) + 3y = 5.15
  • 4.20 – 2y + 3y = 5.15
  • y = 5.15 – 4.20
  • y = 0.95

So, x = 2.10 – 0.95

  • x = 1.15

Hence, Cost of a taco is $1.15

So, <u>Correct choice</u> - [E] $1.15

6 0
3 years ago
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-BARSIC- [3]

Answer:

C. 104 feet

Step-by-step explanation:

The formula for the perimeter of a rectangle is p= 2(L+W). All you have to do is plug in your values.

8 0
3 years ago
Which of the following rational numbers is equal to 2.8 with a bar over the 8?
Dafna1 [17]
The answer you are looking for is B
5 0
3 years ago
Find the circumference and area of the circle. Use 3.14 for π. Round to the nearest hundredth if necessary.
BARSIC [14]

Answer:

81.64

Step-by-step explanation:

4 0
3 years ago
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