Explain the contribution of the woman's ovum and the man's sperm in determining the sex of a child.
What will be an ideal response?
- When the ovum and sperm meet at fertilization, the ovum provides an X chromosome, whereas the sperm provides either an X or a Y chromosome.
- If the sperm contributes its X chromosome, the XX pairing will produce a girl.
- If the sperm contributes its Y chromosome, the XY pairing will produce a boy.
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Insomnia is a sleep problem characterized by:
a. difficulty in going to sleep or staying asleep through the night b. an excessive amount of lucid dreaming c. night terrors and sleepwalking d. irresistible attacks of sleepiness
Placebo effects occur when a person believes they are cured by a particular technique, even if there is no causal reason for a cure to have occurred
Indicate whether this statement is true or false.
In a ____ study, the investigator examines individuals of different ages at the same point in time
a. longitudinal c. correlational b. cross-sectional d. sequential
Which of the following is not true of the analysis of variance?
a. It has a higher rate of Type I error than the two-sample t-tests. b. It determines whether significant differences exist in an experiment. c. It is used for experiments with two or more sample means. d. It is a parametric procedure.