Straighterline Business Stats Final Latest Update
2024-2025 Actual Exam 350 Questions and 100%
Correct Answers Guaranteed A+
A box plot shows ___________. - CORRECT ANSWER: The relative symmetry of a
distribution for a set of data
A coin is tossed four times. The joint probability that all four tosses will result in a head
is ¼ or 0.25. - CORRECT ANSWER: False
A cola-dispensing machine is set to dispense a mean of 2.02 liters into a container
labeled 2 liters. Actual quantities dispensed vary and the amounts are normally
distributed with a standard deviation of 0.015 liters. What is the probability a container
will have less than 2 liters? - CORRECT ANSWER: 0.0918
A combination of a set of objects is defined by the order of the objects. - CORRECT
ANSWER: False
A company is researching the effectiveness of a new website design to decrease the
time to access a website. Five website users were randomly selected, and their times
(in seconds) to access the website with the old and new designs were recorded. To
compare the times, they computed (new website design time - old website design time).
The results follow.
For a 0.01 significance level, what is the decision regarding the hypothesis that the
training was effective in improving customer relationships? - CORRECT ANSWER: Fail
to reject the null hypothesis.
A company is studying the number of monthly absences among its 125 employees. The
following probability distribution shows the likelihood that people were absent 0, 1, 2, 3,
4, or 5 days last month.
# of days absent prob
,0 0.60
1 0.20
2 0.12
3 0.04
4 0.04
5 0.00
What is the variance of the number of days absent? - CORRECT ANSWER: 1.1616
A confidence interval can be determined for the mean value of Y for a given value of X. -
CORRECT ANSWER: True
A confidence interval for a population proportion uses the uniform distribution to
approximate the binomial distribution. - CORRECT ANSWER: False
A correlation matrix can be used to assess multicollinearity between independent
variables. - CORRECT ANSWER: True
A correlation matrix shows individual correlation coefficients for all pairs of variables. -
CORRECT ANSWER: True
A developer of a new subdivision wants to build homes that are all different. There are
three different interior plans that can be combined with any of five different home
exteriors. How many different homes can be built? - CORRECT ANSWER: 15
A disadvantage of using an arithmetic mean to summarize a set of data is that
__________. - CORRECT ANSWER: It can be biased by one or two extremely small or
large values
A dot plot can be used to show _________________. - CORRECT ANSWER: The
distribution for a quantitative variable
,A dot plot is useful for showing individual observations. - CORRECT ANSWER: True
A dot plot is useful for showing the range of the data. - CORRECT ANSWER: True
A dot plot shows ____________. - CORRECT ANSWER: The general shape of a
distribution
A dot plot shows the symmetry of a distribution. - CORRECT ANSWER: True
A farmer who grows genetically engineered corn is experiencing trouble with corn
borers. A random check of 5,000 ears revealed the following: Many of the ears
contained no borers. Some ears had one borer; A few had two borers, and so on. The
distribution of the number of borers per ear approximated the Poisson distribution. The
farmer counted 3,500 borers in the 5,000 ears. What is the probability that an ear of
corn selected at random will contain no borers? - CORRECT ANSWER: 0.4966
A frequency distribution has a mean of 200 and a standard deviation of 20. The class
limits for one class are 220 up to 240. What are the standard normal z-statistics for the
class limits? - CORRECT ANSWER: 1.0 and 2.0
A group of employees of Unique Services will be surveyed about a new pension plan.
In-depth interviews with each employee selected in the sample will be conducted. The
employees are classified as follows.
Classification Event #of Emp
Supervisors A 120
Maint B 50
Production C 1460
Management D 302
Secretarial E 68
, What is the probability that the first person selected is classified as a maintenance
employee? - CORRECT ANSWER: 0.025
A group of women tried five brands of fingernail polish and ranked them according to
preference. What level of measurement is this? - CORRECT ANSWER: Ordinal
A hypothesis regarding the weight of newborn infants at a community hospital is that the
mean is 6.6 pounds. A sample of seven infants is randomly selected and their weights at
birth are recorded as 9.0, 7.3, 6.0, 8.8, 6.8, 8.4, and 6.6 pounds. What is the alternate
hypothesis? - CORRECT ANSWER: H1: µ ≠ 6.6
A hypothesis regarding the weight of newborn infants at a community hospital is that the
mean is 6.6 pounds. A sample of seven infants is randomly selected and their weights at
birth are recorded as 9.0, 7.3, 6.0, 8.8, 6.8, 8.4, and 6.6 pounds. What is the sample
variance? - CORRECT ANSWER: 1.385
A lamp manufacturer designed five lamp bases and four lampshades that could be used
together. How many different arrangements of base and shade can be offered? -
CORRECT ANSWER: 20
A large department store examined a sample of the 18 credit card sales and recorded
the amounts charged for each of three types of credit cards: MasterCard, Visa, and
Discover. Six MasterCard sales, seven Visa, and five Discover sales were recorded.
The store used an ANOVA to test if the mean sales for each credit card were equal.
What are the degrees of freedom for the F statistic? - CORRECT ANSWER: 2 in the
numerator, 15 in the denominator
A large oil company is studying the number of gallons of gasoline purchased per
customer at self-service pumps. The mean number of gallons is 10.0, with a standard
deviation of 3.0 gallons. The median is 10.75 gallons. What is Pearson's coefficient of
skewness in this instance? - CORRECT ANSWER: -0.75
A listing of 100 family annual incomes is an example of statistics. - CORRECT
ANSWER: False
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