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Elis [28]
2 years ago
9

Two random samples were done to determine how often people in a community go to the dentist the first sample surveyed 10 people

as they enter their workplaces. The first sample found that the mean time between visits to the dentist with 7.5 months. The second sample survey 50 people as they enter the local grocery store. The second simple found that the mean time between visits to the dentist is 18.1 months. Which statements are true check all that apply
Mathematics
1 answer:
Murljashka [212]2 years ago
6 0

Answer:

2) The second sample is likely to be more representative of the population.

3)The second sample will give a better representation because it is larger.

5) Community members probably visit the dentist about once every 18 months.

Step-by-step explanation: Just did this on Edge

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1)

                         X            Y          XY       X²

                         27            13           351          729

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r = \frac{n\sum xy - \sum x\sum y }{\sqrt{[n\sum x^{2}-\left (\sum x  \right )^{2}] [n\sum y^{2}-\left (\sum y  \right )^{2}]}}  = \frac{6 \times 5812  - 601 \times 63}{\sqrt{[6 \times 74513-601^{2}] [6  \times 3969 - 63^2]} } = - 0.0725

3) The strength is - association.

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