Test 1
Data collected from several entities over a period of time (minutes, hours, days, etc.) are called _____. a. categorical and quantitative data b. time series data c. source data d. cross-sectional data
ANSWER: B
When working with data sets in Excel, _____ can be used to automatically highlight cells that meet specified requirements. a. averaging b. conditional formatting c. summing d. sorting
ANSWER: B
The amount of time taken by each of 10 students in a class to complete an exam is an example of what type of data? a. Cannot be determined b. Categorical data c. Time series data d. Quantitative data
ANSWER: D
23. The _____ is a point estimate of the population mean for the variable of interest. a. sample mean b. median c. sample d. geometric mean
ANSWER: a
Any data value with a z-score less than -3 or greater than +3 is considered to be a(n) _____. a. outlier b. statistic c. whisker d. z-score value
ANSWER: a
Compute the third quartile for the following data. 10, 15, 17, 21, 25, 12, 16, 11, 13, 22 a. 21.25 b. 15.5 c. 21.5 d. 11.75
ANSWER: a
The act of collecting data that are representative of the population data is called _____. a. random sampling b. sample data c. population sampling d. sources of data
ANSWER: a
A _____ determines how far a particular value is from the mean relative to the data set's standard deviation. a. coefficient of variation b. z-score c. variance d. percentile
ANSWER: b
Compute the coefficient of variation for the following sample data. 32, 41, 36, 24, 29, 30, 40, 22, 25, 37 a. 18.64% b. 21.36% c. 20.28% d. 21.67%
ANSWER: b
Compute the geometric mean for the following data on growth factors of an investment for 10 years. 1.10, 0.50, 0.70, 1.21, 1.25, 1.12, 1.16, 1.11, 1.13, 1.22 a. 1.0221 b. 1.0148 c. 1.0363 d. 1.1475
ANSWER: b
Compute the median of the following data. 32, 41, 36, 24, 29, 30, 40, 22, 25, 37 a. 28 b. 31 c. 40 d. 34
ANSWER: b
Consider the data below. What percentage of students scored grade C? Grades Number of students A 16 B 28 C 33 D 13 Total 90 a. 33% b. 31% c. 37% d. 28% Chapter 02 - Descriptive Statistics (Copyright Cengage Learning. Powered by Cognero. Page 2)
ANSWER: c
The goal regarding using an appropriate number of bins is to show the _____. a. number of observations b. number of variables c. variation in the data d. correlation in the data
ANSWER: c
The variance is based on the a. deviation about the median. b. number of variables. c. deviation about the mean. d. correlation in the data.
ANSWER: c
Which of the following gives the proportion of items in each bin? a. Frequency b. Class size c. Relative frequency d. Bin proportion
ANSWER: c
The data collected from the customers in restaurants about the quality of food is an example of a(n) _____. a. variable study b. cross-sectional study c. experimental study d. observational study
ANSWER: d
A quantity of interest that can take on different values is known as a(n) _____. a. variable b. parameter c. sample d. observation
Answer: A
3. The difference in a variable measured over observations (time, customers, items, etc.) is known as _____. a. observed differences b. variation c. variable change d. descriptive analytics
Answer: B
