Chapter 2: Q 4.3. (page 103)
Trace the density curve onto your paper. Mark the approximate location of the median.

Short Answer
The curve is

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Chapter 2: Q 4.3. (page 103)
Trace the density curve onto your paper. Mark the approximate location of the median.

The curve is

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Travel time (1.2) The dot plot below displays data on students鈥 responses to the question 鈥淗ow long does it usually take you to travel to school?鈥 Describe the shape, center, and spread of the distribution. Are there any outliers?

Teacher raises Refer to Exercise . If each teacher receives a raise instead of a flat raise, the amount of the raise will vary from to depending on the present salary.
(a) What will this do to the mean salary? To the median salary? Explain your answers.
(b) Will a raise increase the IQR? Will it increase the standard deviation? Explain your answers.
R2.10 Grading managers Many companies "grade on a bell curve" to compare the performance of their managers and professional workers. This forces the use of some low-performance ratings, so that not all workers are listed as "above average." Ford Motor Company's "performance management process" for a time assigned A grades, B grades, and C grades to the company's managers. Suppose that Ford's performance scores really are Normally distributed. This year, managers with scores less than received C's, and those with scores above received A's. What are the mean and standard deviation of the scores? Show your work.
The weights of laboratory cockroaches follow a Normal distribution with mean grams and standard deviation grams. The figure below is the Normal curve for this distribution of weights.
Point C on this Normal curve corresponds to
(a) grams.
(c) grams.
(e) grams
(b) grams.
(d) grams.

R2.4 Aussie, Aussie, Aussie A group of Australian students were asked to estimate the width of their classroom in feet. Use the dot plot and summary statistics below to answer the following questions.
(a) Suppose we converted each student's guess from feet to meters . How would the shape of the distribution be affected? Find the mean, median, standard deviation, and IQR for the transformed data.
(b) The actual width of the room was feet. Suppose we calculated the error in each student's guess as follows: guess . Find the mean and standard deviation of the errors. How good were the students' guesses? Justify your answer.
Approximately locate the median (equal-areas point) and the mean (balance point) on a density curve.
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