Question

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:

		Type of Cookie Sold
		Thin Mints	Tagalongs	Do-si-dos	Trefoils	Samoas
Sales Method	At parents’ workplace	472	641	350	223	401
	Door-to-Door	840	1092	673	511	542
	Community Events	683	742	491	420	374

Step 1) What type of hypothesis test is required here?

Step 2) Verify all assumptions required for this test.

Step 3) State the null and alternate hypotheses for this test using correct symbols and notation.

Step 4) Run the correct test in MINITAB 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 Expected Values of each cell below. Round answers to 2 decimal places.

(Hint: use the output of the statistical test you ran above!)

		Type of Cookie Sold
		Thin Mints	Tagalongs	Do-si-dos	Trefoils	Samoas
Sales Method	At parents’ workplace
	Door-to-Door
	Community Events

Step 5) State your statistical decision and justify it.

Step 6) Interpret your decision within the context of the problem: what is your conclusion?

Answer 1

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