Homework answers / question archive / Salem State University ODS 262 QUANTITATIVE ANALYSIS SUMMER SESSION - II , 1st EXAMINATION TRUE or FALSE 1)A continuous variable may take on any value within its relevant range even though the measurement device may not be precise enough to record it

Salem State University ODS 262 QUANTITATIVE ANALYSIS SUMMER SESSION - II , 1st EXAMINATION TRUE or FALSE 1)A continuous variable may take on any value within its relevant range even though the measurement device may not be precise enough to record it

Statistics

Share With

---

Salem State University

ODS 262

QUANTITATIVE ANALYSIS

SUMMER SESSION - II , 1st EXAMINATION

TRUE or FALSE

1)A continuous variable may take on any value within its relevant range even though the measurement device may not be precise enough to record it.

 

TRUE     FALSE

 

 

2.            In general, grouped frequency distributions should have between 5 and 15 class intervals.

 

TRUE     FALSE

 

3.            The sum of cumulative frequencies in a distribution always equals “1”.

 

TRUE     FALSE

 

4.            If the values of the seventh and eighth class in a cumulative frequency distribution are the same, we know that there are no observations in the eighth class.

 

TRUE     FALSE

 

 

5.            The larger the number of observations in a numerical data set, the larger the number of class intervals needed for a grouped frequency distribution.

 

TRUE     FALSE

 

 

6.            The relative frequency is the frequency in each class divided by the total number of observations.

 

TRUE     FALSE

 

7.            Ogives are plotted at the midpoints of the class groupings.

 

TRUE     FALSE

 

 

-8-

 

 

8.            Percentage polygons are plotted at the boundaries of the class groupings.

 

TRUE     FALSE

 

9.            A histogram can have gaps between the bars, whereas bar charts cannot have gaps.

 

TRUE     FALSE

 

10.          Histograms are used for numerical data while bar charts are suitable for categorical data.

 

TRUE     FALSE

 

11.          An ogive is a cumulative percentage polygon.

 

TRUE     FALSE

 

12.          A side-by-side chart is two histograms plotted side-by-side.

 

TRUE     FALSE

 

13.          To determine the width of class interval, divide the number of class groups by the range of the data.

 

TRUE     FALSE

 

14.          The median of the values 3.4, 4.7, 1.9, 7.6, and 6.5 is 1.9.

 

TRUE     FALSE

 

15.          In a set of numerical data, the value for Q2 is always halfway between Q1 and Q3.

 

TRUE     FALSE

 

16.          The 5-number summary consists of the smallest observation, the first quartile, the median, the third quartile, and the largest observation.

 

TRUE     FALSE

 

 

-9-

 

 

17.          In a box-and-whisker plot, the box portion represents the data between the first and third quartile values.

 

TRUE     FALSE

 

18.          The line drawn within the box of the box-and-whisker plot always represents the arithmetic mean.

 

TRUE     FALSE

 

19.          The median of a data set with 20 items would be the average of the 10th and the llth items in the ordered array.

 

TRUE     FALSE

 

 

20.          The coefficient of variation is a measure of central tendency in the data.

 

TRUE     FALSE

 

21.          The interquartile range is a measure of variation or dispersion in a set of data.

 

TRUE     FALSE

 

 

Multiple Choice

 

22.          Which of the following sampling methods is a probability sample?

 

a.            chunk.

b.            quota sample.

c.             stratified sample.

d.            judgement sample.

 

23.          For a population frame containing N = 1,007 individuals, what code number should you assign to the first person on the list in order to use a table of random numbers?

 

a.            0

b.            1

c.             01

d.            0001

 

-10-

 

24.          The Dean of Students mailed a survey to a total of 400 students. The sample included 100 students randomly selected from each of the freshmen, sophomore, junior, and senior classes on campus last term. What sampling method was used?

 

a.            simple random sample.

b.            systematic sample.

c.             stratified sample.

d.            cluster sample.

 

25.          A telemarketer set the company’s computerized dialing system to contact every 25th person listed in the local telephone directory. What sampling method was used?

 

a.            simple random sample.

b.            systematic sample.

c.             stratified sample.

d.            cluster sample.

 

26.          A population frame for a survey contains a listing of 6,179 names. Using a table of random numbers, which of the following code numbers will appear on your list?

 

a.            06

b.            0694

c.             6946

d.            61790

 

27.          If a simple random sample is chosen with replacement, each individual has the same chance of selection on every draw.

 

TRUE     FALSE

 

28.          The only reliable way a researcher can make statistical inferences from a sample to a population is to use nonprobability sampling methods.

 

TRUE     FALSE

 

29.          Sampling error can be reduced by taking larger sample sizes.

 

TRUE     FALSE

 

30.          Selection bias occurs more frequently in systematic samples than in simple random samples.

 

TRUE     FALSE