Problem 5. Please refer "CO2 emissions (metric tons per capita) in 2011" data in "HW#1_Data" (MS Excel). Suppose that the smallest possible change of emissions is 0.01 metric tons. In addition, we assume that the class width is five and the lower class limit of the first class is zero. (a) Generate a frequency table and a histogram using MS Excel. (b) What is the lower class boundary for the third class? (c) What is the upper class boundary for the fourth class? (d) Is the distribution shape symmetric, uniform, skewed to the left, or skewed to the right?

Problem 6. Please refer "CO2 emissions (metric tons per capita) in 2011" data in "HW#1_Data" (MS Excel). (a) Find the mean and median. (b) Suppose the data includes all countries in the world. Find the range, variance, and standard deviation.

Problem 7. Please refer two data sets in "HW#1_Data" (MS Excel): "CO2 emissions (metric tons per capita) in 2011" and "GDP per Capita (in USD) in 2011". (a) Draw a scatterplot. (b) Find the correlation coefficient between CO2 emissions per capita and GDP per capita.

CO2 emissions (metric tons per capita) and GDP per Capita (in USD) in 2011 (source: World Bank Database)
Country	CO2 emissions per Capita	GDP per Capita
Afghanistan	0.43	622.38
Albania	1.61	4437.81
Algeria	3.32	5447.40
Andorra	5.97	41630.05
Angola	1.35	5053.74
Antigua and Barbuda	5.82	12817.84
Argentina	4.56	13392.92
Armenia	1.67	3417.17
Aruba	23.92	25353.79
Australia	16.52	62216.55
Austria	7.77	51123.56
Azerbaijan	3.65	7189.69
Bahamas, The	5.20	21514.90
Bahrain	17.95	22238.71
Bangladesh	0.37	838.55
Barbados	5.58	15530.89
Belarus	6.68	6305.77
Belgium	8.85	47699.81
Belize	1.67	4517.12
Benin	0.51	799.04
Bermuda	6.08	85973.16
Bhutan	0.77	2485.79
Bolivia	1.60	2377.70
Bosnia and Herzegovina	6.20	4779.66
Botswana	2.32	7504.85
Brazil	2.19	13042.42
Brunei Darussalam	24.39	41787.02
Bulgaria	6.71	7750.04
Burkina Faso	0.12	665.81
Burundi	0.02	240.61
Cambodia	0.31	879.15
Cameroon	0.27	1258.92
Canada	14.14	52086.53
Cabo Verde	0.86	3766.11
Central African Republic	0.06	484.58
Chad	0.04	988.44
Chile	4.62	14582.17
China	6.71	5574.19
Colombia	1.56	7227.77
Comoros	0.22	790.57
Congo, Dem. Rep.	0.05	350.27
Congo, Rep.	0.54	3453.22
Costa Rica	1.70	8963.68
Cote d'Ivoire	0.31	1231.87
Croatia	4.80	14542.18
Cuba	3.17	6092.61
Cyprus	6.74	31836.62
Czech Republic	10.43	21656.94
Denmark	7.25	61304.06
Djibouti	0.56	1472.01
Dominica	1.75	7023.35
Dominican Republic	2.18	5820.40
Ecuador	2.35	5223.38
Egypt, Arab Rep.	2.64	2816.67
El Salvador	1.10	3821.34
Equatorial Guinea	8.91	22944.93
Eritrea	0.11	544.46
Estonia	14.05	17453.75
Ethiopia	0.08	355.59
Faeroe Islands	11.72	50910.43
Fiji	1.42	4351.92
Finland	10.16	50787.56
France	5.19	43807.48
Gabon	1.42	11530.15
Gambia, The	0.24	516.98
Georgia	1.77	3219.61
Germany	8.92	45936.08
Ghana	0.40	1587.19
Greece	7.56	25872.01
Grenada	2.41	7410.76
Guatemala	0.75	3166.58
Guinea	0.23	447.79
Guinea-Bissau	0.15	659.48
Guyana	2.36	3408.73
Haiti	0.22	740.95
Honduras	1.10	2323.76
Hong Kong SAR, China	5.70	35142.49
Hungary	4.86	14032.77
Iceland	5.90	45970.89
India	1.66	1471.66
Indonesia	2.30	3647.63
Iran, Islamic Rep.	7.80	7874.48
Iraq	4.20	5839.31
Ireland	7.88	52828.42
Israel	8.95	33707.32
Italy	6.70	38364.94
Jamaica	2.87	5332.47
Japan	9.29	46203.71
Jordan	3.60	4665.95
Kazakhstan	15.81	11357.95
Kenya	0.33	1012.88
Kiribati	0.60	1645.81
Korea, Rep.	11.84	24155.83
Kuwait	28.10	47551.38
Kyrgyz Republic	1.20	1123.88
Lao PDR	0.19	1300.98
Latvia	3.79	13781.21
Lebanon	4.67	9132.43
Lesotho	1.08	1241.21
Liberia	0.22	378.81
Libya	6.20	5517.78
Liechtenstein	1.41	157092.97
Lithuania	4.54	14367.21
Luxembourg	20.90	113239.56
Macao SAR, China	2.13	67012.96
Macedonia, FYR	4.52	5079.96
Madagascar	0.11	456.33
Malawi	0.08	369.60
Malaysia	7.90	10427.76
Maldives	2.93	6497.55
Mali	0.08	680.83
Malta	6.03	22347.71
Marshall Islands	1.95	3290.03
Mauritania	0.63	1390.93
Mauritius	3.13	8984.63
Mexico	3.88	9715.11
Micronesia, Fed. Sts.	1.24	2998.64
Moldova	1.40	1970.57
Mongolia	6.92	3772.93
Montenegro	4.15	7318.74
Morocco	1.74	3066.50
Mozambique	0.13	524.89
Namibia	1.24	5539.62
Nepal	0.16	695.88
Netherlands	10.06	53537.28
New Zealand	7.12	37896.85
Nicaragua	0.84	1679.75
Niger	0.08	378.20
Nigeria	0.54	2514.15
Norway	9.19	100575.12
Oman	20.20	21164.34
Pakistan	0.94	1230.82
Palau	10.86	9765.31
Panama	2.63	9036.04
Papua New Guinea	0.75	1838.70
Paraguay	0.84	3983.50
Peru	1.78	5731.35
Philippines	0.87	2371.85
Poland	8.34	13891.14
Portugal	4.71	23194.74
Qatar	44.02	89115.90
Romania	4.21	9200.28
Russian Federation	12.65	13323.88
Rwanda	0.06	606.90
Samoa	1.25	4063.56
Sao Tome and Principe	0.59	1374.13
Saudi Arabia	18.07	23256.10
Senegal	0.59	1081.13
Serbia	6.80	6423.29
Seychelles	6.84	12189.01
Sierra Leone	0.15	490.88
Singapore	4.32	53121.23
Slovak Republic	6.37	18138.73
Slovenia	7.50	24983.69
Solomon Islands	0.37	1648.85
South Africa	9.26	8080.87
Spain	5.79	31832.24
Sri Lanka	0.73	3128.69
St. Kitts and Nevis	5.05	13737.32
St. Lucia	2.27	7195.67
St. Vincent and the Grenadines	2.18	6183.68
Sudan	0.35	1596.45
Suriname	3.65	8448.50
Swaziland	0.86	4093.38
Sweden	5.52	59593.68
Switzerland	4.63	88002.61
Tajikistan	0.36	841.22
Tanzania	0.15	740.38
Thailand	4.53	5539.49
Timor-Leste	0.16	1015.72
Togo	0.32	572.03
Tonga	0.98	4226.69
Trinidad and Tobago	37.14	18287.40
Tunisia	2.40	4298.09
Turkey	4.38	10584.16
Turkmenistan	12.18	5724.54
Uganda	0.11	591.44
Ukraine	6.26	3569.76
United Arab Emirates	20.43	39901.22
United Kingdom	7.09	41020.38
United States	17.02	49781.36
Uruguay	2.30	14166.56
Uzbekistan	3.91	1544.83
Vanuatu	0.59	3275.02
Venezuela, RB	6.42	10754.59
Vietnam	1.97	1543.03
West Bank and Gaza	0.57	2664.95
Yemen, Rep.	0.92	1282.40
Zambia	0.21	1654.53
Zimbabwe	0.69	768.56