Correct Answer: D

Rationale: In this study, the dependent variable is the 'Average hours worked per week,' as it relies on the different types of 'Hospital Staff' (the independent variable). The amount of time worked per week varies based on the category of staff being considered.
Therefore, the correct choice is D.

Choices A and B incorrectly assign the dependent and independent variables to specific staff categories (Nurses and Physicians), which are actually different elements within the study.
Choice C incorrectly defines the dependent variable as 'Hospital Staff,' when in fact, it is the 'Average hours worked per week' that is dependent on the type of staff.

Correct Answer: D

Rationale:
To arrange the numbers from least to greatest, first convert them to decimals:

1. 7/3 is approximately 2.33
2. 9/2 equals 4.5
3. 10/9 is approximately 1.11
4. 7/8 equals 0.875

Now, arrange the decimals from least to greatest: 0.875 (7/8), 1.11 (10/9), 2.33 (7/3), 4.5 (9/2).
Therefore, the correct order is 7/8, 10/9, 7/3, 9/2.
Choice A is incorrect because it doesn't follow the correct order.
Choice B is incorrect as it places 9/2 before 7/3, which is not the right arrangement.
Choice C is incorrect as it places 7/3 before 9/2 and 10/9, which is incorrect. Thus, the correct answer is choice D.

Correct Answer: A

Rationale: The best relationship is C = 3.60h because the cost increases by $3.60 for each hour of rental. This equation represents a linear relationship where the total cost (
C) is directly proportional to the number of hours rented (h).
Choice B (C = h + 3.60) is incorrect because it wrongly assumes a fixed additional cost of $3.60 regardless of the number of hours rented.
Choice C (C = 3.60h + 10.80) is incorrect as it overestimates the initial cost.
Choice D (C = 10.80h) is incorrect as it implies a constant rate of $10.80 per hour, which is not the case.

Correct Answer: B

Rationale: The correct answer is B. In a double bar graph, Group A is positively skewed, meaning its data is clustered on the left and has a tail extending to the right. On the other hand, Group B displays a normal distribution where the data is evenly distributed around the mean.

Choices A, C, and D are incorrect as they inaccurately describe the skewness and distribution of the data in Group A and Group B.

Correct Answer: A

Rationale:
To solve the equation, follow the order of operations (PEMDAS/BODMAS): Parentheses, Exponents, Multiplication and Division (from left to right), Addition and Subtraction (from left to right).

1. Calculate inside the parentheses first: (2)(2) = 4.
2.
Then, perform multiplication and division: 2 + 4 - 1 = 6 - 1 = 5.


Therefore, the correct answer is 5.


Choice B (3) is incorrect because multiplication is done before subtraction.

Choices C (2) and D (1) are incorrect as they do not follow the correct order of operations to solve the equation.