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[Solved] MATH221 Assignments Week 1: Homework

Score for this attempt: 30 out of 30
Submitted Feb 28 at 5:47pm
This attempt took 33 minutes.

Question 1

2 / 2 pts

In a survey of 1000 adults, 34% found they prefer charcoal to gas grills. The 34% would be considered a:

Homework Help:

1DA. Population/parameter/sample/statistic/inferential/descriptive

Population

Parameter

Sample

Statistic

Question 2

2 / 2 pts

The average age of students in a statistics class is 28 years. The 28 years would be considered an example of:

Homework Help:

1DA. Population/parameter/sample/statistic/inferential/descriptive

Inferential statistics

Descriptive statistics

Qualitative data

A population

Question 3

2 / 2 pts

The ages of 20 first graders would be considered:

Homework Help:

1DB. Qualitative/quantitative/nominal/ordinal/interval/ratio

Interval data

Quantitative data

Qualitative data
Nominal data

Question 4

2 / 2 pts

The ratings of 50 movies would be considered:

Homework Help:

1DB. Qualitative/quantitative/nominal/ordinal/interval/ratio

Quantitative data

Interval data

Ratio data

Ordinal data

Question 5

2 / 2 pts

A researcher randomly selects and interviews fifty male and fifty female teachers. This sampling technique is called:

Homework Help:

1DC. Random/cluster/stratified/convenience/systematic

Cluster

Stratified

Convenience

Question 6

2 / 2 pts

Cameras are set up to watch an intersection and determine how many cars are let through with each green light interval. This study design would be considered:

Homework Help:

1DD. Observational/experiment/simulation/survey

Survey

Experimental

Observational

Simulation

Question 7

2 / 2 pts

Which of the following would be the mean of this data set: 5, 7, 12, 36, 14, 12, 33, 21

Homework Help:

1VA. Calculating mean/standard deviation/variance (population and sample)

Links to an external site.

1DE. Mean/median/mode/right skewed/left skewed/normal

Links to an external site.

1DF. Range/variance/standard deviation (population and sample) and shape of distribution,�

13.00

17.5

11.6

11.4

Question 8

2 / 2 pts

Which of the following would be the variance of this population data set: 3, 6, 8, 9, 4, 5, 7, 1, 9, 7, 15, 4, 3, 1

Homework Help:

1VA. Calculating mean/standard deviation/variance (population and sample)

13.00

14.00

25.73

3.74

Question 9

2 / 2 pts

What is the relationship between variance and standard deviation?

Homework Help:

1VA. Calculating mean/standard deviation/variance (population and sample)

Links to an external site.

1DF. Range/variance/standard deviation (population and sample) and shape of distribution, examples

Standard deviation is four times the variance

Variance is the square root of the standard deviation

Standard deviation is the square root of the variance

Variance is four times the standard deviation

Question 10

2 / 2 pts

A meteorologist wants to create a graph that displays thehigh temperature for each day for the past30 days.�Which of the following graphs might be most effective to use?

Homework Help:

1DE. Mean/median/mode/right skewed/left skewed/normal

Scatter plot

Line chart

Pie chart

Pareto chart

Question 11

2 / 2 pts

Given the following data:  12.1, 56.8, 14.4, 45.2, 14.4, 23.7, 14.4, 21.3, 17.6.  Determine themean

Homework Help:

1DH. Modes

12.1

24.4

14.4

Question 12

2 / 2 pts

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

Homework Help:

1DC. Random/cluster/stratified/convenience/systematic

Every 10th product in the line is selected

Products are put into groups, some groups are selected and all products from each selected group are included in the sample

Samples are randomly selected throughout the day

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

Question 13

2 / 2 pts

A graph shows 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:

Homework Help:

1VD. Graphs: histogram, circle graphs, scatter plots in Excel

Links to an external site. (3:21)

1DG. Graphs

A stem-leaf plot

A frequency histogram

A frequency polygon

A dot plot

Question 14

2 / 2 pts

Match the terms and their definitions

Homework Help:

1VD. Graphs: histogram, circle graphs, scatter plots in Excel

Links to an external site.

1DA. Population/parameter/sample/statistic/inferential/descriptive

Links to an external site.

1DB. Qualitative/quantitative/nominal/ordinal/interval/ratio

Links to an external site.

1DC. Random/cluster/stratified/convenience/systematic

Links to an external site.

1DG. Graphs

Vertical bar chart that shows frequency on the y-ax

Population is divided into groups, some groups are selected and all observations from each selected group are included in the sample

Collection of all data that is 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

2 / 2 pts

Match the terms and their definitions

Homework Help:

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

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 middle value in a dataset
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