1.Classify the scale of the following variables below (i.e.,nominal,ordinal,intervalorratio). Also, indicate if the interval or ratio variables arediscreteorcontinuous.

• Number of past road accidents
• History of past road accident
• Heartbeats per minute
• Time taken to complete race
• Race
• ABO blood type
• Injury severity score that takes values from 1 to 5, with 1 being "very minor", 2 "minor", 3 "moderate", 4 "serious", 5 "very serious".

2. In a rural city in country "A", the incidence rate of a disease is seven times greater in women than in men, but the prevalence rates show no sex differences. What can be inferred from the incidence rate and the prevalence rates in this scenario? Provide an explanation in few sentences.

3. For sequences X, Y, and Z, calculate the following:2 [ X_iY_iZ_i²]

X {1, -2, 4, -2, 0, 1}

Y {0.25, -0.5, 8, 2, 2, 5}

Z {2, 3, 6, 3, 1, 1}