Statistic Unit Test

A fast food chain owner claims that the average number of people who visits their store is 1350 daily with a standard deviation of 30. A random sample of 20 days showed that the average number of people who visits their store is 1400. What is the appropriate form of test statistic?

• q - test

• z - test

• t - test

• x - test

The scatter plot as shown below illustrates a linear association. What correlation exists between the two data given?

• positive correlation

• negative correlation

• zero correlation

• undefined correlation

Which of the following values of r shows the strongest correlation?

• -0.12

• 0.26

• -0.57

• 0.50

The average I.Q. of one hundred statistics students is computed to be 103.

• Population

• Sample

• Parameter

• Statistic

An example of a parameter is:

• the population mean

• the sample mean

• the average number of pb&j sandwiches you eat in a year.

To measure the college's effectiveness in achieving student learning outcomes, TCC selects students by selecting names corresponding to every 50th student ID number. This is an example of a...

• Stratified Sample

• Systematic Sample

• Cluster Sample

• Random Sample

A numerical value used as a summary measure (calculated value) for a sample, such as sample mean, is known as a

• Population Parameter

• Sample Parameter

• Sample Statistic

• Population Mean

• None of the other answers is correct

In a sample of 800 students in a university, 160, or 20% are business majors. Based on the above information, the school's paper reported that "an estimated 20% of all students at the university are business majors." This quoted portion of the report is an example of

• A Sample

• A Population

• A Statistic

• A Parameter

On a flight to Orlando 12% of the 200 passengers were selected for random security screening before boarding. According to the Transportation Security Administration, 15% of passengers at this airport are supposed to be chosen for random screening.

Identify the POPULATION.

• 200 passengers

• All passengers on the flight

• 12% Selected Passengers

• 15% of all passengers

Given the following information, determine whether the statistic is an unbiased estimator. A statistics test is graded from 0-100. A sample of 20 students received an average of an 82 while the average for all statistics students was a 70.

• Biased

• Unbiased