A researcher has conducted an experiment in which the independent variable is room temperature. Two conditions (a hot room and a cold room) were used. The dependent variable was the length of time required to complete a jigsaw puzzle. What is the best way to state that there is a relationship?
a. The mean times to complete the puzzle are not different for the two room conditions.
b. The mean room temperatures are not different for the length of time required to complete the jigsaw puzzle.
c. The mean times to complete the puzzle are different for the two room conditions.
d. The mean room temperatures are different for the length of time required to complete the d. jigsaw puzzles.
Question 2When deciding which type of measure of central tendency is appropriate, we consider the scale of measurement used to measure the
a. variability of the distribution. c. independent variable.
b. mean. d. dependent variable.
Question 3The population mean is estimated by
a. calculating the mean of as many scores as we can get from the population.
b. calculating the mean of a random sample drawn from the population.
c. calculating the mean of a sample and then transforming it to reflect the size of the population.
d. calculating all measures of central tendency for a random sample drawn from the population.
Question 4When it is impossible to obtain all the scores in a population, the best estimate of the population mean is the
a. population median. c. sample mode.
b. sample mean. d. sample median.
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