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A 4-column table with 3 rows. Column 1 has entries site 1, no site 1, total. Column 2 is labeled Site 2 with entries step 1, 30, 85. Column 3 is labeled no site 2 with entries step 2, step 4, step 5. Column 4 is labeled total with entries 80, step 3, 140.

Joseph completed the two-way table on the left about the social networking habits of his classmates as follows:

Step 1: 85 – 30 = 55

Step 2: 80 – 55 = 25

Step 3: 140 – 80 = 60

Step 4: 60 – 30 = 30

Step 5: 25 + 30 = 55

The student made

1 answer

some errors in their calculations for the two-way table and the conclusions drawn from the data. Based on the provided entries and the steps Joseph took, let's analyze each calculation:

  1. Step 1: 85 – 30 = 55

    • This calculation is correct. It indicates that out of the 85 participants in "Site 2," 30 did not use "Site 1," thus leaving 55 who used "Site 1."

  2. Step 2: 80 – 55 = 25

    • This calculation is incorrect. It seems to suggest that the total number of participants (80) minus those who use both sites (55) equals those who only use "Site 2." However, the values must be verified against the table layout to ensure logical consistency.

  3. Step 3: 140 – 80 = 60

    • This calculation lacks context for clarity. It likely aims to find the number of individuals who do not use either site, but without the table entries being fully confirmed, we cannot ascertain the correctness.

  4. Step 4: 60 – 30 = 30

    • This calculation appears incorrect if it is attempting to identify those who use "Site 1" but do not use "Site 2." Clarification and adjustment may be necessary based on step definitions.

  5. Step 5: 25 + 30 = 55

    • This calculation is incorrect because the parts should add up correctly according to the totals previously established; it must be verified against each entry's total for correctness.

In summary, while some calculations are correct, there are notable inconsistencies and possible misunderstandings in how totals and individual site usage should be calculated in this two-way table. Joseph needs to review the logical structure of the table and the relationships between the entries to ensure accurate calculations.