HW BUAL 2600 1,2,3

The number of weekly sales calls by a sample of 25 pharmaceutical salespersons is below. 24, 56, 43, 35, 37, 27, 29, 44, 34, 28, 33, 28, 46, 31, 38, 41, 48, 38, 27, 29, 37, 33, 31, 40, 50 How many classes should be used in the construction of a histogram?

5

In a statistics class, the following 10 scores were randomly selected: 74, 73, 77, 77, 71, 68, 65,77, 67, 66. What is the mean?

71.5

In a statistics class, the following 10 scores were randomly selected: 74, 73, 77, 77, 71, 68, 65,77, 67, 66.What is the median?

72

In a statistics class, the following 10 scores were randomly selected: 74, 73, 77, 77, 71, 68, 65,77, 67, 66. What is the mode?

77

A(n) ________ can be used to differentiate the "vital few" causes of quality problems from the "trivial many" causes of quality problems.

Pareto chart

A ________ displays the frequency of each class with qualitative data

bar chart

Transactional data are now used by businesses as part of

big data

The ________ is the positive square root of the sample variance.

sample standard deviation

________ is the difference between a numerical descriptor of the population and the corresponding descriptor of the sample.

sampling error

A ________ shows the relationship between two variables.

scatter plot

Which of the following graphical tools is not used to study the shapes of distributions?

scatter plot

All of the following are measures of central tendency except the ________.

range

The following is a partial relative frequency distribution of grades in an introductory statistics course. GradeRelative Frequency A=0.22 B=? C=0.18 D=0.17 F=0.06 Find the relative frequency for the B grade.

0.37

The following is a relative frequency distribution of grades in an introductory statistics course. GradeRelative Frequency A=0.22 B=0.37 C=0.18 D=0.17 F=0.06 If we wish to depict these data using a pie chart, find how many degrees (out of 360 degrees) should be assigned to grade B

133.2

Which percentile describes the first quartile, Q1?

25th

A normal population has 99.73 percent of the population measurements within ________ standard deviation(s) of the mean.

3

The following is a relative frequency distribution of grades in an introductory statistics course. GradeRelative Frequency A=0.22 B=0.37 C=0.18 D=0.17 F=0.06 If this was the distribution of 200 students, give the frequency distribution for grade A.

44

In ________ we select elements because they are easy to sample.

Convenience sampling

The number of weekly sales calls by a sample of 25 pharmaceutical salespersons is below. 24, 56, 43, 35, 37, 27, 29, 44, 34, 28, 33, 28, 46, 31, 38, 41, 48, 38, 27, 29, 37, 33, 31, 40, 50 What is the shape of the distribution of the data?

Skewed to the right

A quantity that measures the variation of a population or a sample relative to its mean iscalled the ________.

coefficient of variation

Which of the following is a measure of the strength of the linear relationshipbetween x and y that is dependent on the units in which x and y are measured?

covariance

A Yes or No question is ________.

dichotomous

Which of the following is a type of question used in survey research?

dichotomous open-ended multiple-choice

Which of the following divides quantitative measurements into classes and graphs the frequency, relative frequency, or percentage frequency for each class?

histogram

a ________ displays the frequency of each class with quantitative data.

histogram

If a population distribution is skewed to the right, then, given a random sample from thatpopulation, one would expect that the ________.

median would be less than the mean

Which of the following is a quantitative variable?

milage of a car

Data that are collected by an individual through personally planned experimentation or observation are ________

primary data

________ sampling is where we know the chance that each element will be included in the sample, which allows us to make statistical inferences about the sample population.

probability

One method of being sure a sample being studied can be used to make statistical inferences about the population is to select a

probability sample

A sequence of operations that takes inputs and turns them into outputs is a ________.

process