Judge news, polls and political ads: bias, wording, sample size and context

Grade 12 Social Studies Worksheet - Building Confidence

Circle the best answer.

1. Read this first

   Use this

   Cards A to D on four items about library hours in Calder (all invented, for practice). Card A, "News story" (by a staff reporter, the Calder Courier, June 4): The board met June 3. The story quotes two board members, one for and one against, and gives the vote. Card B, "Column" (signed by an editor, headed "Our View"): "Longer hours would serve every family in Calder. The board should say yes." Card C, "Ad" (a box in the Courier, with the line "Paid for by Friends of Longer Hours"): "Library visits have doubled since 2019! Support longer hours." The ad gives no source for the visits. Card D, "Notice" (posted by the library board, June 5): "On June 3 the board voted 4 to 3 to open the main branch two extra evenings a week, starting September 1."

2. 1.

   Ari wants a record of what the board decided. Which item in Cards A to D is the most direct record?

   • The ad, since it names the group that wants the result and cites visits
   • The news story, since a reporter attended the meeting and gives the vote
   • The column, since an editor signed it and says what the board should do
   • The notice, posted by the board itself with the vote and the date
3. 2.

   Bo reads Card C. Which step should a careful reader take before repeating its claim about visits?

   • Repeat it, since a printed ad in the Courier has been checked by the paper
   • Reject it, since an ad paid for by a group can never contain a true claim
   • Compare it with the column, since both use the word 'longer'
   • Look for a source: the ad cites none, and a group with a stake paid for it
4. 3.

   Jun reads this claim: 'The column shows most families in Calder want longer hours.' Which response do the cards support?

   • Wrong: the board voted 4 to 3, so most families must oppose longer hours
   • Right: Card C says visits doubled, which shows families want longer hours
   • Right: Card B says longer hours would serve each family, so families must want them
   • Overstated: Card B is the editor's view, and no card counts what families want

5. Use this

   Cards A and B on polls. Card A, "How polls work" (summary in our words, not a quotation): A poll asks a sample of people. If the sample is chosen at random from the whole group, its results can describe the group. For a poll of n people chosen at random, the margin of error is about 100 divided by the square root of n, in percentage points. For a change between two separate polls of the same size, the margin is about 1.4 times that. A poll in which people choose themselves to answer is not a random sample, so the rule does not apply to it. Card B, "Two polls about a skate park in Hollis" (invented, for practice): Poll 1: a skaters' web page posts a link, and 2,500 visitors vote. Eighty percent say build it. Poll 2: a polling firm phones 400 randomly chosen Hollis adults. Fifty-eight percent say build it.

6. 4.

   Luz uses Card A on Poll 2: 58 percent, 400 randomly chosen adults. The margin is about 5 points. Can the poll say a majority of Hollis adults want the park?

   • No: the range is 48 to 68, because the margin is doubled to 10 points
   • No: 58 is within 8 points of 50, so the result is too close to call
   • Yes: the range is about 53 to 63 percent, which stays above 50
   • Yes, but because Poll 1 found 80 percent and confirms it
7. 5.

   Milo reads Card B. Why might Poll 1's 80 percent overstate support among all Hollis adults?

   • Online polls cannot be counted, since anyone can click more than once
   • Visitors to a skaters' page chose to answer, and likely want a park
   • The margin of error for Poll 1 is 10 points, which makes 80 percent uncertain
   • 2,500 is too few people for a percentage to mean anything about a town
8. 6.

   Noah reads this claim: 'Poll 1 has more people than Poll 2, so it is more accurate for the town.' Which response do Cards A and B support?

   • Right: the more people vote, the more the vote shows the whole town
   • Wrong: Poll 2 asked adults and Poll 1 asked skaters, so skaters' views do not count
   • Right: the margin of error falls as the sample grows, so 2,500 beats 400 in each case
   • Weak: sample choice matters more than size, and Poll 1's 2,500 chose themselves

9. Use this

   Cards A to C on a quote in Calder (invented, for practice). Card A, "What the councilmember said" (at the June 3 meeting): "I support extending hours at the main branch, but I cannot support cutting the bookmobile to pay for it." Councilmember Ortiz. Card B, "The ad" (a box in the Courier, with the line "Paid for by Friends of Longer Hours"): "Councilmember Ortiz says she 'cannot support' this plan." Card C, "The rule" (a Calder rule): Every political ad must say who paid for it.

10. 7.

    Pia compares Cards A and B. What does the ad leave out of the councilmember's sentence?

    • The date of the meeting, which the ad should have printed with the quote
    • The words 'cannot support,' which the ad changed to 'cannot approve'
    • Ortiz's position on the bookmobile, which the ad stated in full
    • The first half: Ortiz supports extending hours at the main branch
11. 8.

    Ren reads Cards A and B. Which tactic does the ad use?

    • A quote cut so it seems to say the opposite of the full sentence
    • A loaded word, which makes a plan sound good or bad before any facts
    • A false statistic, since the ad gives a number for the plan
    • An invented quote, since Ortiz did not say 'cannot support'
12. 9.

    Tala reads Cards B and C. What does the line 'Paid for by Friends of Longer Hours' tell a reader?

    • The ad is official, since a Calder rule requires the line
    • The ad is the Courier's own report, because the line appears inside the paper
    • Who paid: a group that wants the result, a reason to check the full statement
    • The quote is false, since a group that wants a result twists words
13. 10.

    Zee reads this claim: 'Ortiz opposes longer library hours.' Which response do the cards support?

    • Weak: Ortiz supports longer hours and opposes cutting the bookmobile (Card A)
    • Right: Ortiz mentions the bookmobile, so Ortiz must oppose spending on libraries
    • Right: Card B quotes Ortiz as saying 'cannot support' this plan
    • Wrong: Ortiz voted for the plan, as the 4 to 3 board vote shows