Question: A university divides students into groups (undergrad, master’s, doctoral) and randomly samples from each group in proportion to their share of the population. Which sampling method is being used?
Answer Choices:
A) Stratified Sampling
B) Cluster Sampling
C) Systematic Sampling
D) Simple Random Sampling
Answer: A) Stratified Sampling.
Question: To determine the insurance premium of a car, an insurance company considers the following determinants: the age of the car, the model of the car, and the mileage of the car. Which of the following is the dependent variable?
Answer Choices:
Model
Age
Mileage
Insurance premium
Answer: Insurance premium
Question: In interval estimation, as the sample size becomes larger, the interval estimate _____.
Answer Choices:
A) remains the same, because the mean is not changing.
B) gets closer to 1.96.
C) becomes wider.
D) becomes narrower.
Answer: D) becomes narrower.
Question: The table shows vapor pressure of water at various temperatures. The greatest change in vapor pressure occurs between:
Answer Choices:
90° and 100°C
0° and 10°C
60° and 70°C
30° and 40°C
Answer: A. 90° and 100°C
Question: What type of chemical reaction is represented by the equation: AgNO₃ + NaCl → AgCl + NaNO₃
Answer Choices:
Double Replacement
Combustion
Decomposition
Single Replacement
Answer: A. Double Replacement
Question: Graphs show systolic BP for four clients 30 days before/after starting a new med on March 1. What can be inferred?
Answer Choices:
The new medication caused a decrease in some clients’ systolic blood pressure.
The new medication caused an increase in some clients’ systolic blood pressure.
All clients’ blood pressure decreased after March 1.
There was no change in blood pressure for any client after March 1.
Answer: The new medication caused a decrease in some clients’ systolic blood pressure.
Question: Which of these processes is responsible for the production of CO₂ by yeast cells from sugar solution?
Answer Choices:
Anaerobic respiration
Translocation
Capillary action
Photosynthesis
Answer: A. Anaerobic respiration
Question: A two-tailed test is performed at the .05 level of significance and the p-value is .04. The null hypothesis _____.
Answer Choices:
A) could be rejected, depending on the sample size.
B) must be rejected.
C) has been designed incorrectly.
D) should not be rejected.
Answer: B) must be rejected.
Question: As the sample size increases, the margin of error _____.
Answer Choices:
A) decreases.
B) increases.
C) stays the same.
D) fluctuates depending on the mean.
Answer: A) decreases.
Question: The table below shows the miles driven as a function of gallons of gas used. When the function is graphed, what does the ordered pair (6, 144) represent?
Answer Choices:
The driver can go 144 miles with 6 gallons of gas.
The driver can go 24 miles in 1 hour.
The driver can go 144 miles in 6 hours.
The driver can go 6 miles with 144 gallons of gas.
Answer: The driver can go 144 miles with 6 gallons of gas.
Question: A penny made only of copper would be classified as
Answer Choices:
Pure substance that is an element
Pure substance that is a compound
Homogeneous mixture of two elements
Heterogeneous mixture of two compounds
Answer: A. Pure substance that is an element