MATH 221 Week 1 Quiz 1

MATH 221 Week 1 Quiz 1| Devry University

Week 1: Homework Results for Venus Forehand

Question 1

The age of every fourth person entering a department store. The selected individuals would be considered a:

1DA. Population/parameter/sample/statistic/inferential/descriptive (Links to an external site.) (DOCX)  

·         Population    

·         Sample    

·         Statistic  

·         Parameter

 

 Question 2

Based on past experience, it is predicted that 31% of registered voters in Oklahoma will vote in the next primary. The 31% would be considered an example of:

1DA. Population/parameter/sample/statistic/inferential/descriptive (Links to an external site.) (DOCX)  

·         Inferential statistics  

·         Descriptive statistics  

·         A sample  

·         Qualitative data

 

 Question 3

The milligrams of tar in 30 cigarettes would be considered:

1DB. Qualitative/quantitative/nominal/ordinal/interval/ratio (Links to an external site.) (DOCX)  

·         Nominal data  

·         Interval data    

·         Ratio data 

·         Ordinal data

 

 Question 4

The ratings of 50 movies would be considered:

1DB. Qualitative/quantitative/nominal/ordinal/interval/ratio (Links to an external site.) (DOCX) 

·         Quantitative data  

·         Ratio data  

·         Interval data    

·         Ordinal data

 

 Question 5

Every fifth person boarding a plane is asked additional security questions. This sampling technique is called:

1DC. Random/cluster/stratified/convenience/systematic (Links to an external site.) (DOCX)  

·         Random    

·         Systematic  

·         Cluster  

·         Stratified

 

 Question 6

A personal director at a large company would like to determine whether the company cafeteria is widely used by employees. She sits by the cafeteria entrance and counts how many employees enter. This study design would be considered:

1DD. Observational/experiment/simulation/survey (Links to an external site.) (DOCX)  

·         Simulation  

·         Survey    

·         Observational  

·         Experimental

 

 Question 7

Which of the following would be the mean of this data set: 5, 17, 22, 56, 4, 2, 33, 21

1VA. Calculating mean/standard deviation/variance (population and sample) (Links to an external site.) (2:57)

1DE. Mean/median/mode/right skewed/left skewed/normal (Links to an external site.) (DOCX)  

·         19.00 

·         20.00  

·         18.06

·         16.90

 Question 8

Which of the following would be the variance of this population data set: 3, 9, 8, 9, 4, 5, 7, 11, 9, 7, 5, 4, 3, 1

1VA. Calculating mean/standard deviation/variance (population and sample) (Links to an external site.) (2:57)  

·         2.92  

·         2.81    

·         7.92  

·         8.53

 

 Question 9

What is the relationship between variance and standard deviation?

1VA. Calculating mean/standard deviation/variance (population and sample) (Links to an external site.) (2:57)

1DF. Range/variance/standard deviation (population and sample) and shape of distribution, examples (Links to an external site.) (DOCX)  

·         Standard deviation is four times the variance  

·         Variance is four times the standard deviation  

·         Variance is the square root of the standard deviation    

·         Standard deviation is the square root of the variance

 

Question 10

Given the data set red, red, blonde, blonde, blonde, blonde, brown, black which of the mean, median or mode would you use to describe the typical or central value in this date set? Why?

1DE. Mean/median/mode/right skewed/left skewed/normal (Links to an external site.) (DOCX)  

·         The mean as this data set has no outliers causing the mean to be skewed.  

·         None of these as this data set is quantitative.  

·         The median as there are outliers at the high end of the data set causing the mean to be skewed high.    

·         The mode as this data set is qualitative and the mean and median require quantitative data.

 

 Question 11

Which data outcome of the speed of cars would best support removing a speed camera?

Homework Help:

1DF. Range/variance/standard deviation (population and sample) and shape of distribution, examples (Links to an external site.) (DOCX)  

·         Low mean with low standard deviation  

·         High mean with small standard deviation 

·         High mean with high standard deviation  

·         Low mean with high standard deviation

 

 Question 12

In manufacturing, stratified sampling could be used to determine if the machines are operating correctly. Which of the following best describes this type of sampling?

1DC. Random/cluster/stratified/convenience/systematic (Links to an external site.) (DOCX)  

·         Every 10th product in the line is selected 

·         Products are put into groups and some are randomly selected from each group  

·         Samples are randomly selected throughout the day  

·         Products are put into groups and all are included from several randomly selected groups

 

 Question 13

A graph shows a line connecting the tops of vertical bars with the number of data points on the y-axis and groups on the x-axis. This graphic is most likely to be:

1VD. Graphs: histogram, circle graphs, scatter plots in Excel (Links to an external site.) (3:21)

1DH. Graphs: histogram, frequency polygon, stem-leaf plot, dot plot (Links to an external site.) (DOCX)  

·         A dot plot  

·         A stem-leaf plot    

·         A frequency polygon  

·         A frequency histogram

 

 Question 14

Match the terms and their definitions

1VD. Graphs: histogram, circle graphs, scatter plots in Excel (Links to an external site.) (3:21)

1DA. Population/parameter/sample/statistic/inferential/descriptive (Links to an external site.) (DOCX)

1DB. Qualitative/quantitative/nominal/ordinal/interval/ratio (Links to an external site.) (DOCX)

1DC. Random/cluster/stratified/convenience/systematic (Links to an external site.) (DOCX)

1DH. Graphs: histogram, frequency polygon, stem-leaf plot, dot plot (Links to an external site.) (DOCX)

·         Vertical bar chart that shows frequency on the y-axis             

·         A sample where the population is divided into groups and several groups are randomly selected from all from those selected groups are sampled               

·         Collection of all counts that are of interest               

·         A subset or part of a population             

·         A sample where the population is divided into groups and several are randomly sampled form each group               

·         Consists of attributes, labels, or nonnumerical entries

 

 Question 15

Match the terms and their definitions

1DE. Mean/median/mode/right skewed/left skewed/normal (Links to an external site.) (DOCX)

1DF. Range/variance/standard deviation (population and sample) and shape of distribution, examples (Links to an external site.) (DOCX)

·         The most frequent number appearing in a dataset

·         The average               

·         The difference between the largest and smallest data points             

·         The square root of the variance             

·         The difference between the third and first quartiles