You are contacted by the top cookie-selling Girl Scout troop in the city. As part of their sales plan for next year’s cookie selling season, they need to know (with 90% confidence) if the types of cookies purchased by their customers depends on where the scouts sell them. Here is their confidential sales data from last year:
GIRL SCOUT COOKIES
You are contacted by the top cookie-selling Girl Scout troop in the city. As part of their sales plan for next year’s cookie selling season, they need to know (with 90% confidence) if the types of cookies purchased by their customers depends on where the scouts sell them. Here is their confidential sales data from last year:
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Type of Cookie Sold |
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Thin Mints |
Tagalongs |
Do-si-dos |
Trefoils |
Samoas |
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Sales Method |
At parents’ workplace |
472 |
641 |
350 |
223 |
401 |
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Door-to-Door |
840 |
1092 |
673 |
511 |
542 |
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Community |
683 |
742 |
491 |
420 |
374 |
What type of hypothesis test is required here? Verify all assumptions required for this test:
State the null and alternate hypotheses for this test:
Run the correct test using a software and provide the information below. Use correct symbols and round answers to 3 decimal places.
Test Statistic = Degrees of freedom =
Critical Value = p-value =
Fill-in the
(Hint: use the output of the statistical test you ran above!)
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Type of Cookie Sold |
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Thin Mints |
Tagalongs |
Do-si-dos |
Trefoils |
Samoas |
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Sales Method |
At parents’ workplace |
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Door-to-Door |
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Community Events |
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State your statistical decision (and justify it!) Interpret your decision within the context of the problem: what is your conclusion?
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