given a double bar graph which statement is true about group a and group b distributions

ATI TEAS 7

Math Practice TEAS Test

1. Given a double bar graph, which statement is true about the distributions of Group A and Group B?

A. Group A is negatively skewed, Group B is normal.
B. Group A is positively skewed, Group B is normal.
C. Group A is positively skewed, Group B is neutral.
D. Group A is normal, Group B is negatively skewed.

Correct answer: B

Rationale: The correct answer is B. In statistical terms, a positively skewed distribution means that the tail on the right side of the distribution is longer or fatter than the left side, indicating more high values. Therefore, Group A is positively skewed. Conversely, an approximately normal distribution, also known as a bell curve, is symmetrical with no skewness. Hence, Group B is normal. Choices A, C, and D are incorrect because they do not accurately describe the skewness of Group A and the normal distribution of Group B as depicted in a double bar graph.

2. Why are elements in Group 18 (Noble gases) generally unreactive?

A. They have high atomic masses
B. They lack valence electrons
C. Their outermost electron shells are completely filled
D. They exist as single atoms, not molecules

Correct answer: C

Rationale: Elements in Group 18 (Noble gases) are generally unreactive because their outermost electron shells are completely filled. This results in high stability and low reactivity since they have achieved a full valence shell configuration, making them less likely to gain, lose, or share electrons with other atoms. The full valence shell configuration leads to a minimal tendency for these elements to form chemical bonds, hence exhibiting low reactivity. Choices A, B, and D are incorrect because high atomic masses, lack of valence electrons, and existing as single atoms do not directly contribute to the unreactivity of noble gases. It is the full valence shell configuration that is the primary reason for their inert nature.

3. What is the role of the appendix, a small pouch attached to the large intestine?

A. To store waste products
B. To produce immune cells
C. To secrete digestive enzymes
D. To regulate blood sugar levels

Correct answer: B

Rationale: The appendix is a small pouch attached to the large intestine and is part of the lymphatic system. Its main function is to produce immune cells, particularly lymphocytes, which play a crucial role in fighting infections and maintaining gut health. Therefore, the correct answer is B. The appendix does not serve to store waste products (option A), secrete digestive enzymes (option C), or regulate blood sugar levels (option D).

4. Which of the following sentences uses proper capitalization?

A. Last summer, my family went on a trip to Niagara Falls in New York.
B. Last summer, my family went on a trip to Niagara Falls in New York.
C. Last summer, my family went on a trip to Niagara Falls in New York.
D. Last summer, my family went on a trip to Niagara Falls in New York.

Correct answer: C

Rationale: The correct sentence uses lowercase 'summer' and capitalizes 'Niagara Falls.' Choice A incorrectly capitalizes 'Summer,' while Choice B incorrectly capitalizes 'niagara falls' and should have 'New York' capitalized. Choice D incorrectly capitalizes 'Summer' and 'new york.'

5. Identify the spectator ions in the reaction: 2KCl + Pb(NO3)2 → 2KNO3 + PbCl2.

A. K+ and NO3-
B. K+ and Cl-
C. Pb2+ and NO3-
D. Pb2+ and Cl-

Correct answer: B

Rationale: - In the reaction, potassium ions (K+) and chloride ions (Cl-) are present on both sides of the equation. They are not involved in the formation of the products and remain unchanged. - Lead ions (Pb2+) and nitrate ions (NO3-) are involved in the formation of the products potassium nitrate (KNO3) and lead(II) chloride (PbCl2). - Therefore, the spectator ions in this reaction are K+ and Cl-.