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Sophie [7]
3 years ago
11

An economist conducted a study of the possible association between weekly income and weekly grocery expenditures. The particular

interest was whether higher income would result in shoppers spending more on groceries. A random sample of shoppers at a local supermarket was obtained, and a questionnaire was administered asking about the weekly income of the shopper’s family and the grocery bill for that week. The gender of the shopper was also obtained. The correlation was found to be r = 0.649 . The amount of variation in the response explained by the regression line is: 0.421 %. 64.9 %. 42.1 %. 0.649 %.
Mathematics
1 answer:
kolezko [41]3 years ago
5 0

Answer:

42.1% of variation in the response is explained by the regression line

Step-by-step explanation:

Correlation coefficient is a measure which tells us that how strongly are two variables under study are linearly related to each other i.e correlation coefficient gives the strength of linear association between the variables.

If the magnitude of correlation coefficient is closer to 1, it indicates a strong linear relationship. If the magnitude of correlation coefficient is closer to 0, it indicates a weak linear relationship.

There is another variable known as "Coefficient of Determination", which is equal to square of Correlation Coefficient. Coefficient of Determination tells us that what percentage of variation in the response of the study can be explained by the regression line.

This means, for this question we need to calculate the Coefficient of Determination.

Correlation coefficient = r = 0.649

Coefficient of Determination = R = r² = (0.649)²= 0.421 = 42.1 %

This means that 42.1% of variation in the response is explained by the regression line.

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your cell phone plans costs$34.99 per month plus $0.11 for each text message you send or receive you have at most $40 to spend o
KIM [24]

Answer:

45

Step-by-step explanation:

Subtract $34.99 from $40 to figure out how much money you have left for text messages.  

You have $5.01 left and you divide that by $0.11 (cost for each text).  Your answer is 45.5454.  Since you can’t send 1/2 a text, your answer is 45.

5 0
3 years ago
Solving Systems of Equations by Substitution<br><br> y=1/2x+5<br><br> y=-3/2x-7
DerKrebs [107]
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4 0
3 years ago
Does the order in which you perform the subtraction matter in the distance formula?
Helen [10]

PEMDAS should always be followed when doing math.

Parenthesis ()

Exponents ^

Multiplication *

Division /

Addition +

Subtraction -


Does the order in which you perform the subtraction matter in the distance formula?

Does the order in which you perform the subtraction matter in the slope formula?

Subtraction should always be performed lastly.

6 0
3 years ago
When considering whether or not to buy an extended warranty for a large purchase, what are some factors that you should consider
baherus [9]
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</span>
7 0
3 years ago
Read 2 more answers
State University has no honors English course but instead places all freshman scoring at least 60 on a proficiency exam (mean=50
rusak2 [61]

Answer:

that put into the advanced course is 396.75

Step-by-step explanation:

The computation of that put into the advanced course is shown below:

P(X>60)

= P((X - mean) ÷ s > (60 - 50) ÷ 10)

= P (Z > 1)

= 0.1587

It could be checked by the standard normal table

Now that put into the advance course is

= 2,500 × 0.1587

= 396.75

Hence, that put into the advanced course is 396.75

4 0
2 years ago
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