A medical doctor who had been working in the US states of Arizona and New Mexico moved to the state of Minnesota near the border with North Dakota (see map below). He was surprised when he saw lower mortality rates of skin cancer in Minnesota/North Dakota than he saw in Arizona/New Mexico. Based on his observations that the two northern states had lower mortality rates of skin cancer than the two southern states, he developed the following hypothesis- increasing latitude (moving farther north in the northern hemisphere) causes the mortality rates of skin cancer to decrease. To test this hypothesis he determined the mortality rate of skin cancer in each of the 50 states and determined the latitude of the center of the state. Prediction: if the hypothesis is true, there should be a negative correlation between latitude and skin cancer mortality rates, as shown below. Comment on the doctor’s conclusion that his results show that increasing latitude caused skin cancer mortality rates to decrease.

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A medical doctor who had been working in the US states of Arizona and New Mexico moved to the state of Minnesota near the border with North Dakota (see map below). He was surprised when he saw lower mortality rates of skin cancer in Minnesota/North Dakota than he saw in Arizona/New Mexico.

Based on his observations that the two northern states had lower mortality rates of skin cancer than the two southern states, he developed the following hypothesis- increasing latitude (moving farther north in the northern hemisphere) causes the mortality rates of skin cancer to decrease.

To test this hypothesis he determined the mortality rate of skin cancer in each of the 50 states and determined the latitude of the center of the state.

Prediction: if the hypothesis is true, there should be a negative correlation between latitude and skin cancer mortality rates, as shown below.

Comment on the doctor’s conclusion that his results show that increasing latitude caused skin cancer mortality rates to decrease.

 
Skin Cancer Mortality versus State Latitude
225
200
175-
150
125
100-
30
35
40
45
50
Latitude (at center of state)
Mortality (Deaths per 10 million)
Transcribed Image Text:Skin Cancer Mortality versus State Latitude 225 200 175- 150 125 100- 30 35 40 45 50 Latitude (at center of state) Mortality (Deaths per 10 million)
New Hampshire
Washington
Vermont
Massachusetts
Maine
Montana
North Dakota
Oregon
Minnesota
Wisconsin
Idaho
South Dakota
New York
Wyoming
Michigan
Rhode Island
lowa
Pennsylvania
Nebraska
Connecticut
Nevada
Ohio
-New Jersey
Utah
Ilinois Indiana
Colorado
Delaware
California
Kansas
Missouri
Virginia
Maryland
Kentucky
District of Colurmbia
North Carolina
Tennessee
West Virginia
Arizona
Oklahoma
South
Carolina
Arkansas
New Mexico
U.S. Virgin Islands
Puerto Rico
Alabama Georgia
Mississippi
Техas
Guam-
Louisiana
Alaska
Northern Mariana Islands
Florida
American Samoa
Hawaii
Transcribed Image Text:New Hampshire Washington Vermont Massachusetts Maine Montana North Dakota Oregon Minnesota Wisconsin Idaho South Dakota New York Wyoming Michigan Rhode Island lowa Pennsylvania Nebraska Connecticut Nevada Ohio -New Jersey Utah Ilinois Indiana Colorado Delaware California Kansas Missouri Virginia Maryland Kentucky District of Colurmbia North Carolina Tennessee West Virginia Arizona Oklahoma South Carolina Arkansas New Mexico U.S. Virgin Islands Puerto Rico Alabama Georgia Mississippi Техas Guam- Louisiana Alaska Northern Mariana Islands Florida American Samoa Hawaii
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