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LenaWriter [7]
3 years ago
6

If there is a positive correlation between number of years studying math and shoe size ​(for children), does that prove that lar

ger shoes cause more studying of math​, or vice​ versa? Can you think of a hidden variable that might be influencing both of the other​ variables?
Mathematics
1 answer:
stealth61 [152]3 years ago
8 0

Answer:

The hidden variable is age.

Step-by-step explanation:

That does not prove that  larger shoes cause more studying math or vice versa.

The children with larger shoes are most probably older  so they would have done  more years of studying than the younger ones.

The hidden variable is the age of the child.

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Find the area and perimeter of a rectangle if<br> the length is 25 and the width is 8.
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1. The chi-squared statistic = 10.36

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Step-by-step explanation:

1. The Chi squared test is given as follows;

\chi ^{2} = \sum \dfrac{\left (Observed - Expected  \right )^{2}}{Expected  }

Therefore,

                              UTI   No UTI    %     Total

Cranberry juice       8           42      84     50

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Control                    18          30      60    50

The chi-squared statistic is given as follows;

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The p-value for the test = 0.89  

2. The range of the p-value from the Chi squared table is given as follows;

0.75 < p-value < 0.90.

5 0
3 years ago
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