The following table gives the average daily high temperatures in January and July for several cities. Find a 95% confidence interval for the mean temperature difference between summer and winter.
a) Check the assumptions and conditions. If you find a city that doesn't belong with the others, set it aside.
b) Compute your interval for the data (adjusted, if necessary), and explain what it means.

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Jan. July 50 89 Location Amsterdam Netherlands) Athens (Greece) Auckland (New Zealand) 73 56 Nassau (Bahamas) 77 88 Beijing (China) Belgrade (Yugoslavia) 38 81 Paris (France) Berlin (Germany) Cairo (Egypt) Calcutta (India) Copenhagen (Denmark) 36 72 Rome (Italy) Dublin (Ireland) Glasgow (Scotland) 43 66 Stockholm (Sweden) 31 70 Hamilton (Bermuda) 68 85 Taipei (Taiwan) Helsinki (Finland) 27 71 Tokyo (Japan) Hong Kong (China) 90 Toronto (Canada) 3079 Istanbul (Turkey) Jerusalem (Usrael) 5 Lisbon (Portugal) London (United Kingdom) 44 73 Jan. July Location Madrid (Spain) 4169 Montreal (Canada) 22 79 54 90 Moscow (Russia) 21 76 35 87 Oslo (Norway) 30 73 35 74 Prague (Czech 65 96 Republic) 80 89 Quebec (Canada) 19 77 42 76 34 74 54 88 47 6 Seoul (Korea) 33 84 66 92 48 84 48 78 Vancouver (Canada) 42 71 55 87 Vienna (Austria)34 75 56 79 Zurich (Switzerland) 36 77