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Which probability distribution is used to develop a percent defective chart?
A. Normal distribution
B. Chi-square distribution
C. Poisson distribution
D. Binomial distribution
Based on the Nielsen ratings, the local CBS affiliate claims its 11 p.m. newscast reaches
41% of the viewing audience in the area. In a survey of 100 viewers, 36% indicated that
they watch the late evening news on this local CBS station. What is the critical value if
α = 0.01?
A. +2.576
B. +2.326
C. 2.576
D. -2.326
Sometimes, a data set has two values that have the highest and equal frequencies. In this
case, the distribution of the data can best be described as __________.
A. Symmetric
B. Bimodal (having two modes)
C. Positively skewed
D. Negatively skewed
Fifty-five voters from a sample of 80 indicated that they favored casino gambling in
their city. The city council is interested in finding out whether or not there is a
significant difference between the proportions of those favoring and not favoring casino
gambling in their community.
The decision regarding the null hypothesis is ______________.
A. do not reject H0
B. to accept both the null and alternative hypotheses
C. reject H0
D. that there is insufficient information to determine which hypothesis to reject
A statistics professor receives an average of five e-mail messages per day from
students. Assume the number of messages approximates a Poisson distribution. What is
the probability that on a randomly selected day she will have no messages?
A. 0.0067
B. Zero
C. 0.0335
D. Impossible to have no messages
A quality control chart is used to monitor the customer wait time at a local call center.
Sample means of five times are averaged and plotted over time. The last five sample
means show a trend of increasing sample means. The process is:
A. out of control.
B. in control.
C. improving.
D. showing chance variation.
A student was interested in the cigarette smoking habits of college students and
collected data from an unbiased random sample of students. The data is summarized in
the following table:
What type of chart best represents the frequency table?
A. Bar chart
B. Box plot
C. Scatter plot
D. Frequency polygon
Several employees have submitted different methods of assembling a subassembly.
Sample data for each method are:
How many treatments are there?
A. 3
B. 4
C. 12
D. 0
A dot plot is best applied when _____________________.
A. The mean, median, and mode are equal
B. The general shape of a distribution is symmetric
C. The relationship between two variables is summarized
D. A single variable is summarized
When testing the difference between two dependent population means, the test statistic
is based on a ______________.
A. Pooled variance
B. Standard deviation of the differences
C. Pooled proportion
D. Sum of the population variances
The monthly salaries of a sample of 100 employees were rounded to the nearest $10.
They ranged from a low of $1,040 to a high of $1,720. If we want to condense the data
into seven classes, what is the most convenient class interval?
A. $50
B. $100
C. $150
D. $200
Which of the following tests is not a distribution-free test?
A. Rank correlation
B. Student's t
C. Kruskal-Wallis
D. Wilcoxon rank-sum
Refer to the following breakdown of responses to a survey of room service in a hotel.
What type of chart should be used to show relative class frequencies?
A. A pie chart
B. A bar chart
C. A histogram
D. A frequency polygon
Sampling error is defined as _________.
A.
B. σ
C. σ/n
D. N - n
A new machine is set or calibrated to fill tubes of toothpaste at precisely 6.75 ounces.
Then, once the machine is running, a sample of six tubes is taken every three hours and
weighed with the following results:
What is the value of the upper control factor of the range?
A. 0
B. 2.115
C. 2.004
D. 3.0
For the coefficient of rank correlation, what scale is used to measure the data?
A. nominal
B. ordinal
C. interval
D. ratio
The adjusted R2 accounts for the number of independent variables by ____________.
A. Adding one to the R2
B. Using the degrees of freedom
C. Multiplying by the multiple standard error of the estimate
D. Using a subscript for R2
What is the value of the Pearson coefficient of skewness for a distribution with a mean
of 17, a median of 12, and a standard deviation of 6?
A. +2.5
B. -2.5
C. +0.83
D. -0.83
The national sales manager for "I colored this" (ICT) T-shirts provides all salespersons
with the payoff table shown next, giving the estimated profit when a retailer purchases
from one to four dozen T-shirts. The probability of demand for each state of nature is
also shown.
What is the expected payoff for purchasing three dozen T-shirts?
A. 72
B. 120
C. 168
D. 192
Recently, students in a marketing research class were interested in the driving behavior
of students. Specifically, the marketing students were interested in finding out if
exceeding the speed limit was related to gender. They collected the following responses
from 100 randomly selected students:
The null hypothesis for the analysis is ____________.
A. There is no relationship between gender and speeding
B. The correlation between driving behavior and gender is zero
C. As driving behavior increases, gender increases
D. The mean of driving behavior equals the mean of gender
Random samples of four items are selected from a manufacturing process at regular
intervals and a certain quality characteristic is measured. After 25 samples,
How many samples were collected?
A. 4
B. 25
C. 100
D. 20
The __________ method for computing a weighted price index uses base year weights.
A characteristic of a population is called a ______________.
The proportion of the area under a normal curve that is to the right of a z score, and that
is equal to zero, is ________.
In testing the significance of Spearman's rank-order coefficient, the alternate hypothesis
is ______________________.
An ANOVA has three sources of variation. They are _____, _____, and _____.
A tire manufacturing company is reviewing its warranty for their rainmaker tire. The
warranty is for 40,000 miles. The distribution of tire wear is normally distributed with a
population standard deviation of 15,000 miles. The tire company believes that the tire
actually lasts more than 40,000 miles. A sample of 49 tires revealed that the mean
number of miles is 45,000 miles. What is H0:?
