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