Current evidence on age-related changes in levels of testosterone in men indicates that _______
a. there is a large and steady decline beginning at about age 40
b. there is a large decline, but it begins only after about age 60
c. there is no decline at all
d. there is a small and gradual decline from midlife onward
d
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A graphical representation of a frequency distribution in which vertical bars are centered above each category along the x-axis and are separated from each other by a space is a _____, and a graphical representation of a frequency distribution in which vertical bars centered above scores on the x-axis touch each other is a _____
a. histogram; bar graph b. frequency polygon; histogram c. bar graph; histogram d. frequency distribution; frequency polygon