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
aliya0001 [1]
3 years ago
10

-Anyone wanna help a sister out??-

Mathematics
2 answers:
GalinKa [24]3 years ago
5 0
The answer would be A because a <span>correlation coefficient is only </span>-1 \leq r \leq 1
Scrat [10]3 years ago
3 0

Answer:

Option A - The researcher made an error because −1 ≤ r ≤ 1.

Step-by-step explanation:

Given : A researcher is trying to find out if there is a correlation between the U.S. economy and the number of hours spent on social media. The researcher determines that the correlation coefficient is r = 1.26.

To find : What does this value mean?

Solution :

By definition of correlation coefficient,

The correlation coefficient r measures the strength and direction of a linear relationship between two variables on a scatter plot.

The value of r is always between +1 and –1 i.e, -1\leq r\leq 1

According to researcher,

The correlation coefficient is r = 1.26 >1

So, From the options it means

The researcher made an error because −1 ≤ r ≤ 1.  

Therefore, Option A is correct.

You might be interested in
Solve for x in the equation x 2 - 4 x - 9 = 29.
Marizza181 [45]

Answer:

x= -19

Step-by-step explanation:

2x-4x-9=29

-2x=29+9

x=38/-2

= -19

5 0
3 years ago
Read 2 more answers
A workers regular hourly rate of pay is $13. What is the workers total pay for working 40 regulars and 3 hours overtime at a rat
ANTONII [103]

Answer:

578.50

Step-by-step explanation:

The worker worked 40 hours at 13 dollars

40 * 13 =520

Then they worked 3 hours at 13(1.5) or 19.50

3*19.50 =58.5

The total amount of money earned is regular time plus overtime

520 + 58.5 =578.50

3 0
3 years ago
In a​ study, researchers wanted to measure the effect of alcohol on the hippocampal​ region, the portion of the brain responsibl
ziro4ka [17]

Answer:

The hippocampus volumes in the alcoholic adolescents are less than the normal volume of 9.02 cm³

Step-by-step explanation:

Let x= the hippocampus volumes in the alcoholic adolescents

We'll conduct a hypothesis test at the 0.01 significance level with

Null hypothesis: x = 9.02 cm³

Alternate hypothesis: x < 9.02 cm³

A sample of 13 alcoholic adolescents gives the parameters

size=N= 13

mean=M= 8.12 cm³

standard deviation= s= 0.8 cm³

According to the sample, with 99% confidence, t statistic for the value X=9.02 can be found using the formula:

t=\frac{X-M}{\frac{s}{\sqrt{N} } } where

  • M is the sample mean (8.12)
  • s is the standard deviation of the sample (0.8)
  • N is the sample size (13)

If we put these numbers in the formula:

t=\frac{9.02-8.12}{\frac{0.8}{\sqrt{13} } } =4.056

One tailed critical value for the sample with 12 degrees of freedom (sample size-1) in 99% confidence level is 2.681.

Since t value (4.056) is bigger than the critical value, we fail to reject the alternate hypothesis, therefore reject the null hypothesis and accept alternate hypothesis.

5 0
3 years ago
Isaiah has $20 to spend on bowling. He has four bowling alleys to choose from, and the price each charges for a game is shown in
Feliz [49]

Answer:

b is correct

Step-by-step explanation:

4 0
2 years ago
Read 2 more answers
Which expression is equivalent to b^m•b^n<br> A. b^m•n<br> B. b^m-n<br> C. b^m+n<br> D. b^m÷n
blsea [12.9K]

b^m\cdot b^n=b^{n+m}


Answer: C. b^m+n


Example

2^3\cdot2^4=(\underbrace{2\cdot2\cdot2}_{3})\cdot(\underbrace{2\cdot2\cdot2\cdot2}_{4})=\underbrace{2\cdot2\cdot2\cdot2\cdot2\cdot2\cdot2}_{3+4=7}=2^7:



3 0
3 years ago
Read 2 more answers
Other questions:
  • Two math classes took the same quiz. The scores of 10 randomly selected students from each class are listed below. Sample of Cla
    14·1 answer
  • MARKING BRAINLIESTT !!
    10·1 answer
  • Simplify the expression.<br> 2+3(x-4) *
    11·2 answers
  • Cuales el numero menor que 34.969.387 y mayor que 34.969.385​
    7·1 answer
  • To Do, I-Re..
    5·1 answer
  • Write an equation in slope-intercept form of the line that passes through (1, −9) and (−3, −9).
    5·1 answer
  • Verizon offers a cell phone plan where customers buy a cell phone for $300 and pay a monthly fee of $40. T- Mobile offers a cell
    11·1 answer
  • What value of "p" will the pair of equations
    15·1 answer
  • Heyy pls help with these math questions hurry!
    8·1 answer
  • PLZ HELP!!!!
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!