What sample size is needed to estimate with 95 percent confidence the mean intake of calcium
within 20 units of the true mean if the intake is normal with a variance of 1900 units?
The quality control manager of a tire company wishes to estimate the tensile strength of a
standard size of rubber used to make a class of radial tires. A random sample of 61 pieces of
rubber from different production batches is subjected to a stress
A sample of 2,000 people yielded
=.52. What is the variance of the population proportion?
Variance = (.0112)2 = .00012
Bowerman - Chapter 08 #122
Learning Objective: 09-02 Describe Type I and Type II errors and their probabilities.
Topic: Type I or Type II error
When the null hypothesis is true, there is no possibility of making a Type I error.
AACSB: Reflective Thinkin
A sample set of weights in pounds are 1.01, .95, 1.03, 1.04, .97, .97, .99, 1.01, and 1.03.
Assume the population of weights are normally distributed. Find a 99 percent confidence
interval for the mean population weight.
A. [.965 1.035]
B. [.969 1.031
Learning Objective: 08-04 Determine the appropriate sample size when estimating a population mean.
Topic: Sample size determination for population mean
Research has been conducted that studies the role that the age of workers has in determining
1. The manager of the quality department for a tire manufacturing company wants to know the
average tensile strength of rubber used in making a certain brand of radial tire. The population is
normally distributed and the population st
Determine the p-value for H0: p .5 versus HA: p > .5 when n = 225 and
Z = (.54 - .5)/ (.5)2/225) = 1.21
p-value = (1-.8869) = .1131
Bowerman - Chapter 09 #67
Learning Objective: 09-05
In a randomly selected group of 650 automobile deaths, 180 were alcohol related. Construct a
95 percent confidence interval for the true proportion of all automobile accidents caused by
A. [.243 .311]
B. [.262 .292]
C. [.259 .294]
D. [.263 .
57. If a null hypothesis is rejected at a significance level of .01, it will _ be rejected at a
significance level of .05.
58. If a null hypothesis is rejected at a significance level of .05, it will _ be rejected at a
When sample size is 11, find t.025.
df = 11-1 = 10
AACSB: Reflective Thinking
Bowerman - Chapter 08 #144
Learning Objective: 08-02 Describe the properties of the t distribution and use a t table.
71. In testing H0: = 23 versus HA: > 23 when
=26, s = 6, and n = 20, what is the value of the
72. In testing H0: 23 versus HA: > 23 when
= 26, = 6, and n = 30, what is the value of the
73. In testing H0: p = .2 versus HA: p
Prof. Beaubien International Business 4/1/2008 Geert Hofstede's Cultural Dimensions Analysis of Ireland Power Distance Index: According to Hofstede's analysis of IBM employees and related studies that followed, the people of Ireland do not believe th
Prof. Beaubien International Business 4/6/2008 Case Analysis: HKD Many lessons can be learned from Disney's experiences in global expansion. The strategies employed in the three international park openings encompassed a wide spectrum of successes and