Question

practice:

1. list the si units for length,

mass, time and temperature.

1. the following data was

collected for a runner’s speed:
4 mi/hr, 3 mi/hr, 6.9 mi/hr, and
7 mi/hr.
a. is this data precise?
explain.
b. if the runner tends to run
5 mi/hr, is this data an
accurate representation
of the runner’s ability?
explain.

1. convert the following values:

a. 150 cm to mm
b. 1,200 ks to s

1. convert the following values:

a. 20°c to °f
b. 300 k to °c
c. 98°f to k

Explanation:

Question 1

SI units: Length is meter (m), mass is kilogram (kg), time is second (s), temperature is kelvin (K).

Precision refers to how close measurements are to each other. The data (4, 3, 6.9, 7 mi/hr) have a wide range (3 to 7, 6.9 is close to 7 but 3 - 4 are lower), so they aren't precise as values aren't clustered closely.

Accuracy is how close data is to the true value (5 mi/hr). The values (4, 3, 6.9, 7) have an average around (4 + 3 + 6.9 + 7)/4 = 5.225, close to 5, but individual values (3, 6.9, 7) deviate. However, the average is near 5, but the spread is large. But generally, since some values (4 is close, 3 is low, 6.9/7 high) don't all center on 5, it's not a highly accurate representation, but the average is close. Wait, accuracy is about how close each measurement is to the true value. So 3 is far from 5, 4 is close, 6.9 and 7 are far. So overall, the data isn't an accurate representation because most values (3, 6.9, 7) deviate significantly from 5 mi/hr.

Answer:

Length: meter (m); Mass: kilogram (kg); Time: second (s); Temperature: kelvin (K)

Question 2a