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2 years ago

What is the value of x?

Mathematics

1 answer:

fiasKO [112]2 years ago

6 0

Answer:

x=23

Step-by-step explanation:

2x+3=49

2x=49-3

2x=46

x=23

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3 years ago

A 90 percent confidence interval for the slope of a regression line is determined to be (-0.181, 1.529). Which of the following

GenaCL600 [577]

Answer: a. The correlation coefficient of the data is positive.

Step-by-step explanation:

Estimated slope of sample regression line = $\dfrac{Upper \ limit + lower\ limit}{2}$

Here , confidence interval : (-0.181, 1.529)

Estimated slope of sample regression line = $\dfrac{-0.181+1.529}{2}$

$=\dfrac{1.348}{2}\\\\=0.674\ \ \ \ [\text{ positive}]$

⇒Correlation coefficient(r) must be positive, So a. is true.

But, d. and e. are wrong(0.674 ≠ 0 or 1.348).

We cannot check residuals or its sum from confidence interval of slope of a regression line, so b is wrong.

We cannot say that scatterplot is linear as we cannot determine it from interval, so c. is wrong

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2 years ago

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Tatiana [17]

Step-by-step explanation:

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3 years ago

Evaluate the sum of the finite geometric series.<br> 1+2+4+8+...+128

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3 years ago

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3 years ago