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Darina [25.2K]
3 years ago
10

A Sociology student investigated the association between a country's Literacy Rate and Life Expectancy, and then drew the conclu

sions listed below. Explain why each statement is incorrect. (Assume that all the calculations were done properly.)
a) The $$R^2$$ of 64% means that the Literacy Rate determines 64% of the Life Expectancy for a country.
b) The slope of the line shows that an increase of 5% in Literacy Rate will produce a 2-year improvement in Life Expectancy.
Mathematics
1 answer:
Gnom [1K]3 years ago
6 0

Solution :

The term 'literacy rate' provides the ability of a person who is from a definite age group can read or write.

a). $R^2$ does not determine the rate at which the variable explains another, but it explains the amount the amount of variability in one of the variables as explained by the other variable.

b). The slope given provides an expected improvement but it cannot guarantee the improvement. The value may be less or it could be more also.

The regression model provides the prediction and not the actual values.

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Step-by-step explanation:

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3 years ago
Last year at a certain high school, there were 125 boys on the honor roll and 80 girls on the honor roll. This year, the number
Elodia [21]

Answer:

6.8% decrease

Step-by-step explanation:

a drop of 8% means that only 92% of 125 boys remained on honor roll from last year; .92 x 125 = 115

a drop of 5% means that only 95% of 80 girls remained on honor roll from last year; .95 x 80 = 76

total number of students on honor roll last year = 125 + 80 = 205

total number of students on honor roll this year = 115 + 76 = 191

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2 years ago
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sattari [20]

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Step-by-step explanation:

4 0
2 years ago
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How do you solve 3 1/4 - 1 5/6
rjkz [21]

Answer:

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Step-by-step explanation:

1) Change the fractions to improper fractions.

   \frac{13}{4} -\frac{11}{6}

2) Change the  denominator to a common denominator.

\frac{39}{12} -\frac{22}{12}

3) Minus the Numerators.

\frac{39}{12} -\frac{22}{12}=\frac{17}{12}

4) Changing it to a mixed number

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3 years ago
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The slope of that line is -1, so m = -1.

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But we'd clean up that x-(-2) to be x+2.

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