When testing the means of independent samples, the null hypothesis is best thought of as
a. the mean of population 1 is equal to the mean of population 2.
b. the mean of population 1 is unequal to the mean of population 2.
c. the mean of a set of difference scores is equal to 0.
d. the two population means don't differ by more than 10 points.
A
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In order to increase typing speed Minisoft has redesigned its keyboard and provided a chime that is related to typing speed. The company wants to know if its innovations affect typing speed
Identify the independent and dependent variables in this proposed study. a) The dependent variable is the chime; the independent variables are the chime and typing speed. b) The dependent variable is speed of typing; the independent variables are the keyboard design and the chime. c) The dependent variable is keyboard design; the independent variables are the speed of typing and the chime. d) The dependent variable is the number of errors made; the independent variables are the chime and the speed of typing.
Surprisingly, a large number of androgen-insensitive males are frequently found to be
a. female professional wrestlers b. female pilots c. female fashion models d. female lawyers or politicians