Quiz's

How to find proportion?

If asked what is proportion of freshman to total you would take total # of freshman and divide it by the total population

We wanted to know just how much hindrance student debt is causing today's graduates, and which groups are affected the most. And does student debt have a differential impact by gender or race? To answer these questions, we analyzed data from Priceonomics customer LendEDU, who surveyed 1,400 college graduates between the ages of 25 and 54 to learn more, we found that on average, people graduate college with nearly $40,000 in debt and that men have more debt than women. What is the sample size in this study?

1400

A survey is conducted among students taking a statistics class. Several variables are measured in the survey. Which of the variables listed below is categorical?

Gender

An airline company wants to survey its customers one day, so they randomly select 5 flights that day and survey every passenger on those flights. What type of sample is this?

Cluster random sample

What is the most efficient sampling method in terms of time and cost among random sampling methods?

Cluster random sample

Some variables were recorded while surveying plants in a wildlife area. Which of the following variables is discrete?

Count of petals of flowers

A concert venue offers tickets in zones: orchestra, grand tier, and balcony. Tickets in the orchestra zone are most expensive, and tickets in the balcony zone are least expensive. Managers of the venue want to survey approximately guests at an upcoming concert about their overall experience. They want to take a stratified random sample of guests based on the venue's zones. Which of these strategies will accomplish their intended design?

Randomly select 50 tickets from each zone and invite those guests to participate in the survey.

Each law firm in one state registers its phone number with the state court system. An employee of the state court system uses a computer to select random registered phone numbers, and the law firms associated with those numbers will be selected for an audit. What type of sample is this?

Simple Random

To answer these questions, we analyzed data from Priceonomics customer LendEDU, who surveyed 1,400 college graduates between the ages of 25 and 54 to learn more, we found that on average, people graduate college with nearly $40,000 in debt and that men have more debt than women. We also discovered that white and Asian college graduates have more debt than their black and hispanic/latino peers. If you want to read the source of this analysis, click (Links to an external site.). What does $40,000 represent, parameter or statistic?

Statistic

A large company surveys employees by taking random samples of managers and non-managerial employees. What type of sample is this?

Stratified random sample

What is the most efficient sampling method in terms of representativeness?

Stratified random sample

In the previous question, you drew a scatter plot. From that scatter plot do you think that there is an association between the two variables

There is a positive weak linear relationship with some potential outliers

A support hotline asks callers to stay on the line after they have completed their call to respond to a short survey. What type of sample is this?

Volunteer sample

When you make comments on a scatter plot, you focus on

outliers, strength of relationship, form of relationship