You are contacted by the top cookie-selling Girl Scout troop

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?