Nursing Elites

1. Like longitudinal research, cross-sectional studies can be threatened by __________.

• A. practice effects
• B. participant dropout
• C. sequential timing
• D. cohort effects

Correct answer: D

Rationale: Cross-sectional studies can be threatened by cohort effects because different age groups may have experienced different historical or social contexts, influencing the results. This disparity can lead to invalid comparisons between age groups, confounding the study's findings. Option A, practice effects, refer to changes in participants' behavior due to repeated testing, not a specific threat to cross-sectional studies. Participant dropout (Option B) is a threat related to attrition in longitudinal studies, not cross-sectional studies. Sequential timing (Option C) does not pose a threat to cross-sectional studies; instead, it refers to the order of tasks in a study design.

2. Which statement describes a limitation of the clinical method?

• A. It may not yield observations typical of participants’ behavior in everyday life.
• B. Researchers cannot control conditions under which participants are observed.
• C. The findings cannot be applied to individuals other than the participant.
• D. It does not usually yield rich, descriptive insights into factors that affect development. Answer: C Page Ref: 30 Skill Level: Understand Topic: Studying Development Difficulty Level: Moderate

Correct answer: C

Rationale: The statement that describes a limitation of the clinical method is that the findings cannot be applied to individuals other than the participant. The clinical method typically involves in-depth studies of individual participants, which may limit generalizability to a broader population. This means that the findings from a clinical study may not be applicable to other individuals who are not directly involved in the study.

3. Katie wonders when she will first be able to hear her fetus's heartbeat through a stethoscope. You tell her that this should happen by the __________.

• A. fourth week of pregnancy
• B. third month of pregnancy
• C. end of the second trimester
• D. beginning of the third trimester

Correct answer: B

Rationale: The correct answer is the third month of pregnancy (choice B). During the third month of pregnancy, which is around 9-12 weeks, a fetal heartbeat can typically be heard using a stethoscope. This is an exciting milestone for expectant parents as it provides reassurance about the baby's well-being. Choices A, C, and D are incorrect because by the fourth week of pregnancy, the fetal heartbeat is not usually detectable with a stethoscope. The end of the second trimester and the beginning of the third trimester are too late in the pregnancy timeline for this milestone.

4. Nine-month-old Avery can retrieve his ball when his mother hides it under a blanket. Avery has begun to master __________.

• A. the tertiary circular reaction
• B. reflexive schemes
• C. object permanence
• D. deferred imitation

Correct answer: C

Rationale: Avery demonstrating the ability to retrieve his ball hidden under a blanket indicates that he has started to understand object permanence. Object permanence is the concept that objects continue to exist even when they are out of sight. This milestone typically occurs around 8-12 months of age. The other choices are incorrect. Option A, the tertiary circular reaction, is related to Piaget's theory of sensorimotor development but does not specifically address object permanence. Reflexive schemes (Option B) refer to simple, reflex-like behaviors and are not directly linked to object permanence. Deferred imitation (Option D) involves the ability to imitate actions observed at an earlier time, which is a different developmental milestone compared to object permanence.

5. During prenatal development, the ectoderm becomes the __________.

• A. muscles and skeleton
• B. nervous system and skin
• C. circulatory system and other internal organs
• D. digestive system, lungs, urinary tract, and glands

Correct answer: B

Rationale: The correct answer is B: nervous system and skin. The nervous system, which includes the brain, spinal cord, and nerves, as well as the skin, develop from the ectoderm layer of cells during prenatal development. Choice A is incorrect because muscles and skeleton develop from mesoderm. Choice C is incorrect because the circulatory system and other internal organs develop from mesoderm and endoderm. Choice D is incorrect because the digestive system, lungs, urinary tract, and glands develop from endoderm.

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