To ensure that the correct number of chromosomes from the father are joined with the mother's chromosomes,
A) only one sperm will survive the journey through the uterus and into the fallopian tube.
B) more than one ovum is ovulated and fertilized during each menstrual cycle.
C) the fallopian tube closes briefly after the entrance of multiple sperm cells.
D) a chemical reaction seals the ovum's outer membrane after penetration by one sperm cell.
D
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In an independent samples t-test comparing the means of a sample of 25 and a sample of 30, the df = 53
Indicate whether the statement is true or false
These are typically made only when a researcher has a logical reason to believe that one particular direction of the effect will occur.
A. null hypothesis B. one-tailed hypothesis C. alternative hypothesis D. two-tailed hypothesis
In their relations with the medical community, African Americans have been reported to
a. display distrust b. follow the guidance of physicians implicitly c. have relatively high organ donor rates d. prefer not to care for dying persons at home e. have good prenatal care leading to relatively low infant death rates
If H1 is nondirectional and the size of the effect of the independent variable decreases, the probability of making a Type I error _________
a. decreases b. increases c. equals zero e. need more information