Chapter 01, Testbank, Question 012
A quantitative variable is the only type of variable that can:
assume numeric values for which arithmetic operations make sense
have no intermediate values
be graphed
be used to prepare tables
Chapter 01, Testbank, Question 015
A qualitative variable is the only type of variable that:
can assume an uncountable set of values
cannot be measured numerically
can assume numerical values
cannot be graphed
SUBMIT ANSWER
Chapter 02, Testbank, Question 067-072
The following table gives the cumulative frequency distribution of the commuting time (in minutes) from home to work for a sample of 400 persons selected from a city
Math
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Chapter 01, Testbank, Question 012
A quantitative variable is the only type of variable that can:
assume numeric values for which arithmetic operations make sense
have no intermediate values
be graphed
be used to prepare tables
Chapter 01, Testbank, Question 015
A qualitative variable is the only type of variable that:
The following table gives the cumulative frequency distribution of the commuting time (in minutes) from home to work for a sample of 400 persons selected from a city.
Time (minutes)
f
0 to less than 10
64
0 to less than 20
157
0 to less than 30
222
0 to less than 40
288
0 to less than 50
352
0 to less than 60
400
The sample size is:
The percentage of persons who commute for less than 30 minutes, rounded to two decimal places, is:
%
The cumulative relative frequency of the fourth class, rounded to four decimal places, is:
The percentage of persons who commute for 40 or more minutes, rounded to two decimal places, is:
%
The percentage of persons who commute for less than 50 minutes, rounded to two decimal places, is:
%
The number of persons who commute for 20 or more minutes is:
Chapter 03, Testbank, Question 027-029
The temperatures (in degrees Fahrenheit) observed during seven days of summer in Los Angeles are:
78 99 68 91 106 75 85
The range of these temperatures is:
The variance of these temperatures, rounded to three decimals, is:
The standard deviation, rounded to three decimals, of these temperatures is:
The following table gives the two-way classification of 500 students based on sex and whether or not they suffer from math anxiety.
Suffer From Math Anxiety
Sex
Yes
No
Male
200
40
Female
135
125
If you randomly select one student from these 500 students, the probability that this selected student is a female is: (round your answer to three decimal places, so 0.0857 would be 0.086)
If you randomly select one student from these 500 students, the probability that this selected student suffers from math anxiety is: (round your answer to three decimal places, so 0.0857 would be 0.086)
If you randomly select one student from these 500 students, the probability that this selected student suffers from math anxiety, given that he is a male is: (round your answer to three decimal places, so 0.0857 would be 0.086)
If you randomly select one student from these 500 students, the probability that this selected student is a female, given that she does not suffer from math anxiety is: (round your answer to three decimal places, so 0.0857 would be 0.086)
Which of the following pairs of events are mutually exclusive?
Male and yes
Female and no
No and yes
Female and yes
Female and male
Male and no
Are the events "Has math anxiety" and "Person is female" independent or dependent? Detail the calculations you performed to determine this.
Chapter 05, Testbank, Question 009
For the probability distribution of a discrete random variable x, the sum of the probabilities of all values of x must be:
A sample of size 84 from a population having standard deviation σ = 46 produced a mean of 261.00. The 95% confidence interval for the population mean (rounded to two decimal places) is:
