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Is there a changes in TV 'on' time between these cities?

An independent investigator has decided to study variations in TV viewing habits among three American cities. She has managed to arbitrarily sample households in Chicago, Atlanta, and Minneapolis and gather data on the daily "on" times for households on a typical day. The data is specified below. Can we approximately with statistical certainty there are differences in TV 'on' time between these cities?

Atlanta

   499

    472

   482

   441

   505

   484

   472

   512

   494

   514

   499

   491

   479

   478

   482

   489

   462

   458

   468

   505

   496

   461

   447

   470

   496

   458

   482

   460

   487

   501

   480

   500

   491

   491

   470

   473

Minneapolis

   516

   554

   579

   555

   534

   577

   478

   529

   601

   555

   573

   582

   602

   591

   580

   522

   538

   535

   603

   582

   573

   621

   571

   574

   609

   554

   552

   547

   607

   583

   578

   583

   541

   541

 

   603

   540

   512

   591

 

   532

   580

   551

   551

 

   459

   541

   502

   559

 

   516

   505

   498

   539

 

   562

   511

   468

   506

 

   498

   497

   526

   500

 

   545

   530

   548

   486

 

   515

   548

   478

   519

 

   529

   465

   479

 


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