5 Questions
| Total Attempts: 381

Questions and Answers

- 1.Sixty-two students were asked to complete a number puzzle. The number of minutes each student needed to complete the puzzle was recorded and the times are displayed in the histogram below. Which of the following describes the distribution?
- A.
The distribution is approximately normal.

- B.
The distribution is roughly symmetric.

- C.
The distribution is bimodal.

- D.
The distribution is skewed left.

- E.
The distribution is skewed right.

- 2.The table below shows the regression output for predicting the number of calories from the number of milligrams of sodium for items at a fast-food chain. Which is a correct interpretation of the slope of the regression line?
- A.
Every milligram of sodium contains 0.2457 calories.

- B.
A food item with one more milligram of sodium than another tends to have 0.2457 more calories.

- C.
A food item with one more milligram of sodium than another tends to have 136.69 more calories.

- D.
A food item with one more milligram of sodium than another tends to have 147.1427 more calories.

- E.
A food item with one more calorie than another tends to have 147.1427 more milligrams of sodium.

- 3.A new fertilizer is to be tested on tomato plants to determine if it increases the production of the plants. The available land is divided into eight plots. Four of the plots are on a hill and four are in a valley as shown. The plots in the valley are expected to get more water due to the influence of gravity, and those on the hill will get more direct sunlight. A randomized block design will be used, using two blocks of four plots each. Which of the following blocking schemes would be most appropriate?
- A.
Plots 1, 2, 3, and 4 in one block and plots 5, 6, 7, and 8 in the other.

- B.
Plots 1, 2, 5, and 6 in one block and plots 3, 4, 7, and 8 in the other.

- C.
Plots 1, 4, 5, and 8 in one block and plots 2, 3, 6, and 7 in the other.

- D.
Plots 1, 3, 6, and 8 in one block and plots 2, 4, 5, and 7 in the other.

- E.
The plots should be randomly assigned to blocks.

- 4.At a large hospital, the durations of emergency room visits, from check-in to discharge, are approximately normally distributed with a mean of 167 minutes and a standard deviation of 76 minutes. Which interval to the nearest minute, contains the middle 80% of durations?
- A.
15 minutes to 319 minutes

- B.
53 minutes to 281 minutes

- C.
70 minutes to 264 minutes

- D.
91 minutes to 243 minutes

- E.
103 minutes to 231 minutes

- 5.Biologists have two different methods for estimating the growth rate of a population of animals. One is based on counting the number of animals in a photographic image, and the other is based on a computer-calculated surface area of the animals in the image. (Larger animals are generally older and contribute more to reproduction.) The scatterplot below shows the estimates of the Population Growth Rate (PGR) for each method along with the line y = x. Which statement is true based on the scatterplot.
- A.
The surface area method overestimates the Population Growth Rate.

- B.
The count method underestimates the Population Growth Rate.

- C.
Both methods overestimate the Population Growth rate.

- D.
Both methods give accurate estimates of the Population Growth Rate.

- E.
There is not enough information to tell how well either method estimates the actual Population Growth Rate.