A class times a toy car rolling down a ramp three times. Trial 1: 12.0 s, Trial 2: 12.6 s, Trial 3: 12.3 s. What is the mean time for the three trials?

A group runs five trials of the same test instead of one. Why do scientists repeat trials and then report the mean?

A group ran five trials and recorded a value for each one. How is the mean of those five values found?

A student heats water and records its temperature every minute for 20 minutes. What kind of graph best shows how the temperature changed over that time?

A student measured how much water each of four different paper towel brands soaked up. What kind of graph best compares the four separate brands?

Four trials of the same water sample in a graduated cylinder read 24.5 mL, 24.8 mL, 24.6 mL, and 31.2 mL. What is the best next step?

A student records four trials of a plant's height gain: 20 mm, 21 mm, 22 mm, and 45 mm. What is the mean of these four trials?

A student tests how the number of paper clips on a toy parachute changes its fall time. In her data table, what belongs in the first column?

A student graphs how the temperature of heating water changed each minute. Which quantity belongs on the horizontal axis of the line graph?

One column of a weather data table holds the entries cloudy, gray, and foggy. A second column holds 18 C, 21 C, and 19 C. How are these two columns best described?

A heating record reads 0 min: 20 C, 5 min: 26 C, 10 min: 32 C, 15 min: 38 C. What pattern do these data show?

A seedling is measured once a week: week 1: 2 cm, week 2: 4 cm, week 3: 6 cm. If the pattern continues, what height is predicted for week 4?

Over eight weeks, a town's ice cream sales rose and the temperature of a nearby pond also rose. What conclusion do these data support?

Group A's three trials measured 8 cm, 10 cm, and 12 cm. Group B's three trials measured 14 cm, 15 cm, and 16 cm. How much greater is Group B's mean than Group A's mean?

Running more trials fixes the error from a balance that always reads 2 grams too high.

A trial result that does not support the hypothesis should be left out of the data table.

A student ran five trials at each of three ramp heights. For each height, what single value should be plotted as one point on the graph?

A student's measurements range from 0 g to 48 g. What is the best scale for the vertical axis of her bar graph?

A data table column is headed only Mass and holds the entries 12, 15, and 19. What is missing from that column heading?

A student claims warmer water dissolves more salt. Her table shows 10 C: 32 g, 20 C: 34 g, 30 C: 37 g dissolved. What evidence in the data best supports the claim?