Developmental Mathematics (9th Edition)
9th Edition
ISBN: 9780321997173
Author: Marvin L. Bittinger, Judith A. Beecher
Publisher: PEARSON
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Chapter 5.2, Problem 8DE
To determine
To calculate: The number of more roller coasters in South America is than that of the roller coaster in Africa from the pictograph where each roller coaster reresented actually 100 roller coasters.
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8.1.8 A civil engineer is analyzing the compressives trength of concrete. Compressive strength is normally distributed with σ2 = 1000(psi)2. A random sample of 12 specimens has a mean compressive strength ofx = 3250 psi.
a. Construct a 95% two-sided confidence interval on mean
compressive strength.
b. Construct a 99% two-sided confidence interval on mean
compressive strength. Compare the width of this confidence
interval with the width of the one found in part (a).
8.1.9Suppose that in Exercise 8.1.8 it is desired to estimate
the compressive strength with an error that is less than 15 psi at
99% confidence. What sample size is required?
8.1.12 Ishikawa et al. [“Evaluation of Adhesiveness of Acinetobacter sp. Tol 5 to Abiotic Surfaces,” Journal of Bioscience and
Bioengineering (Vol. 113(6), pp. 719–725)] studied the adhesion
of various biofilms to solid surfaces for possible use in environmental technologies. Adhesion assay is conducted by measuring
absorbance at A590. Suppose that for the bacterial strain Acinetobacter, five measurements gave readings of 2.69, 5.76, 2.67, 1.62,
and 4.12 dyne-cm2. Assume that the standard deviation is known
to be 0.66 dyne-cm2.
a. Find a 95% confidence interval for the mean adhesion.
b. If the scientists want the confidence interval to be no
wider than 0.55 dyne-cm2, how many observations should
they take?
Answer questions 8.2.1 and 8.2.2 respectively
Chapter 5 Solutions
Developmental Mathematics (9th Edition)
Ch. 5.1 - Objectives 1.6c and 3.4c:Simplify expressions...Ch. 5.1 - Prob. 2SRCh. 5.1 - Prob. 1DECh. 5.1 - Prob. 2DECh. 5.1 - Prob. 3DECh. 5.1 - Prob. 4DECh. 5.1 - GS Sohas sociology professor included the...Ch. 5.1 - Prob. 6DECh. 5.1 - Prob. 7DECh. 5.1 - Prob. 8DE
Ch. 5.1 - Prob. 9DECh. 5.1 - Prob. 10DECh. 5.1 - Prob. 11DECh. 5.1 - Prob. 12DECh. 5.1 - Prob. 13DECh. 5.1 - Prob. 14DECh. 5.1 - Prob. 15DECh. 5.1 - 16. In a lab, Gina determined the mass, in grams,...Ch. 5.1 - Prob. 1RCCh. 5.1 - Prob. 2RCCh. 5.1 - Prob. 3RCCh. 5.1 - Prob. 4RCCh. 5.1 - Prob. 1ESCh. 5.1 - Prob. 2ESCh. 5.1 - Prob. 3ESCh. 5.1 - Prob. 4ESCh. 5.1 - Prob. 5ESCh. 5.1 - Prob. 6ESCh. 5.1 - Prob. 7ESCh. 5.1 - Prob. 8ESCh. 5.1 - Prob. 9ESCh. 5.1 - Prob. 10ESCh. 5.1 - Prob. 11ESCh. 5.1 - Prob. 12ESCh. 5.1 - Prob. 13ESCh. 5.1 - Prob. 14ESCh. 5.1 - Prob. 15ESCh. 5.1 - Prob. 16ESCh. 5.1 - Grading. To get a B in math, Rich must score an...Ch. 5.1 - Prob. 18ESCh. 5.1 - Prob. 19ESCh. 5.1 - Prob. 20ESCh. 5.1 - Median Home Prices. The following table lists the...Ch. 5.1 - Prob. 22ESCh. 5.1 - Movie Ticket Sales. The following table lists the...Ch. 5.1 - Prob. 24ESCh. 5.1 - Prob. 25ESCh. 5.1 - Prob. 26ESCh. 5.1 - Prob. 27ESCh. 5.1 - Prob. 28ESCh. 5.1 - Prob. 29ESCh. 5.1 - Prob. 30ESCh. 5.1 - Prob. 31ESCh. 5.2 - Objective 2.4d: Multiply using mixed numerals....Ch. 5.2 - Prob. 2SRCh. 5.2 - Use the table in Example 1 to answer Margin...Ch. 5.2 - Prob. 2DECh. 5.2 - Prob. 3DECh. 5.2 - Prob. 4DECh. 5.2 - Prob. 5DECh. 5.2 - Prob. 6DECh. 5.2 - Prob. 7DECh. 5.2 - Prob. 8DECh. 5.2 - Prob. 9DECh. 5.2 - Prob. 10DECh. 5.2 - Prob. 11DECh. 5.2 - Prob. 12DECh. 5.2 - Prob. 13DECh. 5.2 - Prob. 14DECh. 5.2 - Prob. 15DECh. 5.2 - Prob. 1RCCh. 5.2 - Prob. 2RCCh. 5.2 - Prob. 3RCCh. 5.2 - Prob. 4RCCh. 5.2 - Prob. 1ESCh. 5.2 - Prob. 2ESCh. 5.2 - Prob. 3ESCh. 5.2 - Prob. 4ESCh. 5.2 - Prob. 5ESCh. 5.2 - Prob. 6ESCh. 5.2 - Prob. 7ESCh. 5.2 - Prob. 8ESCh. 5.2 - Prob. 9ESCh. 5.2 - Prob. 10ESCh. 5.2 - Prob. 11ESCh. 5.2 - Prob. 12ESCh. 5.2 - Prob. 13ESCh. 5.2 - Prob. 14ESCh. 5.2 - Prob. 15ESCh. 5.2 - Prob. 16ESCh. 5.2 - Prob. 17ESCh. 5.2 - Prob. 18ESCh. 5.2 - Prob. 19ESCh. 5.2 - Prob. 20ESCh. 5.2 - Prob. 21ESCh. 5.2 - Prob. 22ESCh. 5.2 - Prob. 23ESCh. 5.2 - Prob. 24ESCh. 5.2 - Prob. 25ESCh. 5.2 - Prob. 26ESCh. 5.2 - Prob. 27ESCh. 5.2 - Prob. 28ESCh. 5.2 - Prob. 29ESCh. 5.2 - Prob. 30ESCh. 5.2 - Prob. 31ESCh. 5.2 - Prob. 32ESCh. 5.2 - Prob. 33ESCh. 5.2 - Prob. 34ESCh. 5.2 - Prob. 35ESCh. 5.2 - Prob. 36ESCh. 5.2 - Prob. 37ESCh. 5.2 - Prob. 38ESCh. 5.2 - Personal Consumption Expenditures. The following...Ch. 5.2 - Personal Consumption Expenditures. The following...Ch. 5.2 - Prob. 41ESCh. 5.2 - Prob. 42ESCh. 5.2 - Prob. 43ESCh. 5.2 - Prob. 44ESCh. 5.2 - Prob. 1MCRCh. 5.2 - Prob. 2MCRCh. 5.2 - Prob. 3MCRCh. 5.2 - Prob. 4MCRCh. 5.2 - Prob. 5MCRCh. 5.2 - Prob. 6MCRCh. 5.2 - Prob. 7MCRCh. 5.2 - Prob. 8MCRCh. 5.2 - Prob. 9MCRCh. 5.2 - Prob. 10MCRCh. 5.2 - Prob. 11MCRCh. 5.2 - Prob. 12MCRCh. 5.2 - Prob. 13MCRCh. 5.2 - Prob. 14MCRCh. 5.2 - Prob. 15MCRCh. 5.2 - Prob. 16MCRCh. 5.2 - Downsizing. Companies sometimes downsize their...Ch. 5.2 - Prob. 18MCRCh. 5.2 - Prob. 19MCRCh. 5.2 - Prob. 20MCRCh. 5.2 - Prob. 21MCRCh. 5.2 - Prob. 22MCRCh. 5.2 - Prob. 23UTDWCh. 5.2 - Answers to Exercises 23 and 24 can be found on...Ch. 5.3 - Objective 3.1c: Given a pair of numbers in decimal...Ch. 5.3 - Objective 3.1c: Given a pair of numbers in decimal...Ch. 5.3 - Prob. 1DECh. 5.3 - Prob. 2DECh. 5.3 - Prob. 3DECh. 5.3 - Prob. 4DECh. 5.3 - Prob. 5DECh. 5.3 - Prob. 6DECh. 5.3 - Prob. 7DECh. 5.3 - Prob. 8DECh. 5.3 - Prob. 1RCCh. 5.3 - Prob. 2RCCh. 5.3 - Prob. 3RCCh. 5.3 - Prob. 4RCCh. 5.3 - Prob. 1ESCh. 5.3 - Prob. 2ESCh. 5.3 - Prob. 3ESCh. 5.3 - Prob. 4ESCh. 5.3 - Prob. 5ESCh. 5.3 - Prob. 6ESCh. 5.3 - Prob. 7ESCh. 5.3 - Prob. 8ESCh. 5.3 - Prob. 9ESCh. 5.3 - Prob. 10ESCh. 5.3 - Prob. 11ESCh. 5.3 - Prob. 12ESCh. 5.3 - Prob. 13ESCh. 5.3 - Prob. 14ESCh. 5.3 - Prob. 15ESCh. 5.3 - Prob. 16ESCh. 5.3 - Prob. 17ESCh. 5.3 - Prob. 18ESCh. 5.3 - Prob. 19ESCh. 5.3 - Prob. 20ESCh. 5.3 - Prob. 21ESCh. 5.3 - Prob. 22ESCh. 5.3 - Prob. 23ESCh. 5.3 - Prob. 24ESCh. 5.3 - Prob. 25ESCh. 5.3 - Prob. 26ESCh. 5.3 - Prob. 27ESCh. 5.3 - Prob. 28ESCh. 5.3 - Prob. 29ESCh. 5.3 - Prob. 30ESCh. 5.3 - Prob. 31ESCh. 5.3 - Prob. 32ESCh. 5.3 - Prob. 33ESCh. 5.3 - Prob. 34ESCh. 5.3 - Prob. 35ESCh. 5.3 - Prob. 36ESCh. 5.3 - Prob. 37ESCh. 5.3 - Prob. 38ESCh. 5.3 - Prob. 39ESCh. 5.3 - Prob. 40ESCh. 5.3 - Prob. 41ESCh. 5.3 - Prob. 42ESCh. 5.3 - Prob. 43ESCh. 5.3 - Prob. 44ESCh. 5.3 - Prob. 45ESCh. 5.3 - Prob. 46ESCh. 5.3 - Prob. 47ESCh. 5.3 - Prob. 48ESCh. 5.3 - Prob. 49ESCh. 5.3 - Prob. 50ESCh. 5.3 - Prob. 51ESCh. 5.3 - Prob. 52ESCh. 5.3 - Prob. 53ESCh. 5.3 - Prob. 54ESCh. 5.3 - Prob. 55ESCh. 5.3 - Prob. 56ESCh. 5.3 - Prob. 57ESCh. 5.3 - Prob. 58ESCh. 5.3 - Prob. 59ESCh. 5.3 - Prob. 60ESCh. 5.4 - Objective 4.3a: Convert from fraction notation to...Ch. 5.4 - Prob. 2SRCh. 5.4 - Prob. 1DECh. 5.4 - Prob. 2DECh. 5.4 - Prob. 3DECh. 5.4 - Prob. 4DECh. 5.4 - Prob. 1TFSCh. 5.4 - Prob. 2TFSCh. 5.4 - Prob. 3TFSCh. 5.4 - Prob. 4TFSCh. 5.4 - Prob. 5TFSCh. 5.4 - The goal of these matching questions is to...Ch. 5.4 - Prob. 7TFSCh. 5.4 - Prob. 8TFSCh. 5.4 - Prob. 9TFSCh. 5.4 - Prob. 10TFSCh. 5.4 - Prob. 1RCCh. 5.4 - Prob. 2RCCh. 5.4 - Prob. 3RCCh. 5.4 - Prob. 4RCCh. 5.4 - Prob. 5RCCh. 5.4 - Prob. 6RCCh. 5.4 - Prob. 1ESCh. 5.4 - Prob. 2ESCh. 5.4 - Prob. 3ESCh. 5.4 - Prob. 4ESCh. 5.4 - Prob. 5ESCh. 5.4 - Prob. 6ESCh. 5.4 - Prob. 7ESCh. 5.4 - Prob. 8ESCh. 5.4 - Prob. 9ESCh. 5.4 - Prob. 10ESCh. 5 - Complete each statement with the correct term from...Ch. 5 - Prob. 2VRCh. 5 - Prob. 3VRCh. 5 - Prob. 4VRCh. 5 - Prob. 5VRCh. 5 - Prob. 6VRCh. 5 - Prob. 1CORCh. 5 - Prob. 2CORCh. 5 - Prob. 3CORCh. 5 - Prob. 1SGPECh. 5 - 2. Use the table in the example shown above for...Ch. 5 - Which oatmeal has the greatest cost per serving?...Ch. 5 - Prob. 4SGPECh. 5 - Prob. 5SGPECh. 5 - Prob. 6SGPECh. 5 - Use the circle graph at left to answer Exercises 7...Ch. 5 - Use the circle graph at left to answer Exercises 7...Ch. 5 - Prob. 1RECh. 5 - Prob. 2RECh. 5 - Prob. 3RECh. 5 - Prob. 4RECh. 5 - Prob. 5RECh. 5 - Prob. 6RECh. 5 - Prob. 7RECh. 5 - Gas Mileage. A 2012 Mazda Miata does 336 mi of...Ch. 5 - Prob. 9RECh. 5 - Prob. 10RECh. 5 - Prob. 11RECh. 5 - Prob. 12RECh. 5 - Prob. 13RECh. 5 - Prob. 14RECh. 5 - Prob. 15RECh. 5 - Prob. 16RECh. 5 - Prob. 17RECh. 5 - Prob. 18RECh. 5 - Prob. 19RECh. 5 - Prob. 20RECh. 5 - Prob. 21RECh. 5 - Prob. 22RECh. 5 - Prob. 23RECh. 5 - Prob. 24RECh. 5 - Prob. 25RECh. 5 - Prob. 26RECh. 5 - Major League World Series. Except for four years,...Ch. 5 - Prob. 28RECh. 5 - Prob. 29RECh. 5 - Prob. 30RECh. 5 - Prob. 31RECh. 5 - Prob. 32RECh. 5 - Prob. 33RECh. 5 - Prob. 34RECh. 5 - Prob. 35RECh. 5 - Prob. 36RECh. 5 - Prob. 37RECh. 5 - Prob. 38RECh. 5 - Prob. 39RECh. 5 - Prob. 40RECh. 5 - Prob. 41RECh. 5 - Prob. 42RECh. 5 - Prob. 43RECh. 5 - Prob. 44RECh. 5 - Prob. 45RECh. 5 - What is the average of this set of data?...Ch. 5 - Prob. 47RECh. 5 - Prob. 48RECh. 5 - Prob. 49RECh. 5 - Prob. 50RECh. 5 - Prob. 1UTDWCh. 5 - Prob. 2UTDWCh. 5 - Prob. 3UTDWCh. 5 - Prob. 4UTDWCh. 5 - Prob. 5UTDWCh. 5 - Prob. 6UTDWCh. 5 - Prob. 1TCh. 5 - Prob. 2TCh. 5 - Prob. 3TCh. 5 - Prob. 4TCh. 5 - Prob. 5TCh. 5 - Prob. 6TCh. 5 - Prob. 7TCh. 5 - Prob. 8TCh. 5 - Prob. 9TCh. 5 - Prob. 10TCh. 5 - Prob. 11TCh. 5 - Prob. 12TCh. 5 - Prob. 13TCh. 5 - Prob. 14TCh. 5 - Prob. 15TCh. 5 - Prob. 16TCh. 5 - Prob. 17TCh. 5 - Prob. 18TCh. 5 - Prob. 19TCh. 5 - Prob. 20TCh. 5 - Prob. 21TCh. 5 - Prob. 22TCh. 5 - Prob. 23TCh. 5 - Prob. 24TCh. 5 - Prob. 25TCh. 5 - 26. Referring to Exercise 25, consider a family...
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- 8.2.3 A research engineer for a tire manufacturer is investigating tire life for a new rubber compound and has built 16 tires and tested them to end-of-life in a road test. The sample mean and standard deviation are 60,139.7 and 3645.94 kilometers. Find a 95% confidence interval on mean tire life. 8.2.4 Determine the t-percentile that is required to construct each of the following one-sided confidence intervals: a. Confidence level = 95%, degrees of freedom = 14 b. Confidence level = 99%, degrees of freedom = 19 c. Confidence level = 99.9%, degrees of freedom = 24arrow_forward8.1.6The yield of a chemical process is being studied. From previous experience, yield is known to be normally distributed and σ = 3. The past 5 days of plant operation have resulted in the following percent yields: 91.6, 88.75, 90.8, 89.95, and 91.3. Find a 95% two-sided confidence interval on the true mean yield. 8.1.7 .A manufacturer produces piston rings for an automobile engine. It is known that ring diameter is normally distributed with σ = 0.001 millimeters. A random sample of 15 rings has a mean diameter of x = 74.036 millimeters. a. Construct a 99% two-sided confidence interval on the mean piston ring diameter. b. Construct a 99% lower-confidence bound on the mean piston ring diameter. Compare the lower bound of this confi- dence interval with the one in part (a).arrow_forward8.1.2 .Consider the one-sided confidence interval expressions for a mean of a normal population. a. What value of zα would result in a 90% CI? b. What value of zα would result in a 95% CI? c. What value of zα would result in a 99% CI? 8.1.3 A random sample has been taken from a normal distribution and the following confidence intervals constructed using the same data: (38.02, 61.98) and (39.95, 60.05) a. What is the value of the sample mean? b. One of these intervals is a 95% CI and the other is a 90% CI. Which one is the 95% CI and why?arrow_forward
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