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
Sophie [7]
3 years ago
5

What is 2 times 4 plus 20 and times 3?

Mathematics
1 answer:
Gennadij [26K]3 years ago
5 0

Answer:

84

Step-by-step explanation:

You might be interested in
A study was conducted to determine whether magnets were effective in treating pain. The values represent measurements of pain us
Zanzabum

Answer:

Step-by-step explanation:

Hello!

The objective of the study is to determine whether the magnets are effective in treating pain. For these two independent groups of individuals with equal affections were randomly sampled, one was treated with magnets and the other group of individuals, call it control group, was treated with a placebo treatment.

The information for both samples is:

X₁: pain measurement using a visual analog scale after the individual received magnet treatments.

X₁~N(μ₁;σ₁²)

n₁= 20

X[bar]₁= 0.46

S₁= 0.93

X₂: pain measurement using a visual analog scale of an individual of the control groups.

X₂~N(μ₂;σ₂²)

n₂= 20

X[bar]₂= 0.41

S₂= 1.26

The claim is that the pain reductions of the control group have more variation than the pain reductions of the target group. If it's so then we could suspect that the population variance of the control group, σ₂², will be greater than the population variance of the magnet group, σ₁².

To test the relationship between these two population variances you have to conduct a variance ratio test using the Snedecors F statistic.

The hypotheses are:

H₀: σ₂² ≤ σ₁²

H₁: σ₂² > σ₁²

α: 0.05

F= (\frac{S_2^2}{S_1^2}) * (\frac{Sigma_2^2}{Sigma_1^2} )~~ F_{(n_2-1);(n_1-1)}

This hypothesis test is one-tailed to the right, there is only one critical value:

F_{(n_2-1);(n_1-1); 1 - \alpha } = F_{19;19; 0.95}= 2.17

The decision rule for the test is:

If F_{H_0} ≥ 2.17, then the decision is to reject the null hypothesis.

If F_{H_0} < 2.17, then the decision is to not reject the null hypothesis.

F_{H_0}= \frac{S_2^2}{S_1^2}*\frac{Sigma_2^2}{Sigma_1^2}  = \frac{(1.26)^2}{(0.93)^2} * 1

F_{H_0} = 1.835 = 1.84

Since the calculated value of F is less than the critical value, the decision is to reject the null hypothesis. So using a 5% significance level the decision is to not reject the null hypothesis, you can conclude that the population variance of the pain reduction of the control group is less or equal than the population variance of the pain reduction on individuals treated with magnets.

I hope it helps!

3 0
3 years ago
If 5+20-22-3x = 10-2-2x + 5, what is the value of x?<br> -3<br> -2<br> 2<br> 3
Olegator [25]

Answer:

-10

Step-by-step explanation:

3 0
3 years ago
The area of the vegetable garden is 0.4 of the community area of 4.5 x 6.2 . What is the area of the vegetable garden?
Gala2k [10]

Answer:

11.16 units²

Step-by-step explanation:

Area of community area=4.5×6.2= 27.9 units²

Area of vegetable garden=27.9×0.4=11.16 units²

5 0
2 years ago
Together Pam, Dan and Sam have 31.00. How many dollars does Sam have if Dan has 3.00 less than Pam, and Sam has 1.00 more than p
shepuryov [24]

Answer:

16.00 dollars

Step-by-step explanation:

7 0
3 years ago
I need help please?!!!!
Marianna [84]
The answer is the last option: The associative property of multiplication
6 0
3 years ago
Other questions:
  • What is the area of the semicircle in this composite figure rounded to the nearest hundredth?
    10·1 answer
  • Y=√x + 3 – 5<br> Find the inverse of the function
    11·1 answer
  • Help me ASAP!!! THANKS! <br><br><br><br><br> RANDOM ANSWERS WILL BE MODERATED!
    6·1 answer
  • What is unit ratio?
    15·2 answers
  • 14.8 ounces, 15.5 ounces, 14.6 ounces, and 15.4 ounces. Estimate the total weight of the four packages.
    11·2 answers
  • I need the answers to both problems please
    13·1 answer
  • Find the area of the regular polygon
    11·1 answer
  • What is the value of x in the following equation? -3x-2=2x+8
    5·1 answer
  • Help plz:)))I’ll mark u Brainliest
    8·1 answer
  • E) What fraction is equal to 50% of<br> 1/6<br> ?
    11·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!