Exam 1: Introduction to Statistics

Identify the data setʹs level of measurement. -marriage status (married, single, or divorced)of the faculty at the University of Colorado

Identify the sampling technique used. -To avoid working late, the quality control manager inspects the last 10 items produced that day.

Determine whether the data set is a population or a sample. -The age of each employee at a local grocery store

Identify the sampling technique used. -A lobbyist for a major airspace firm assigns a number to each legislator and then uses a computer to randomly generate ten numbers. The lobbyist contacts the legislators corresponding to these numbers.

Identify the data setʹs level of measurement. -numbers of touchdowns scored by a major university in five randomly selected games 4 2 4 3 4

Determine whether you would take a census or use a sampling. If you would use a sampling, decide what sampling technique you would use. -The average age of the 80 residents of an assisted living center.

Identify the sampling technique used. -The names of 70 contestants are written on 70 cards. The cards are placed in a bag, and three names are picked from the bag.

Provide an appropriate response. -Explain the difference between a sample and a population.

Identify the data setʹs level of measurement. -number of pages in your statistics book

Identify whether the statement describes inferential statistics or descriptive statistics. -The average age of the students in a statistics class is 22 years.

Determine whether the study is an observational study or an experiment. -A scientist was studying the effects of a new fertilizer on crop yield. She randomly assigned half of the plots on a farm to group one and the remaining plots to group two. On the plots in group one, the new fertilizer was Used for a year. On the plots in group two, the old fertilizer was used. At the end of the year the average crop Yield for the plots in group one was compared with the average crop yield for the plots in group two.

Provide an appropriate response. -A local newspaper ran a survey by asking, ʺDo you support the deployment of a weapon that could kill millions of innocent people?ʺ Determine whether the survey question is biased.

Identify the data setʹs level of measurement. -the nationalities listed in a recent survey (for example, Asian, European, or Hispanic).

Identify the sampling technique used. -Thirty-five sophomores, 24 juniors and 25 seniors are randomly selected from 388 sophomores, 418 juniors and 573 seniors at a certain high school.

Identify the data setʹs level of measurement. -the ratings of a movie ranging from ʺpoorʺ to ʺgoodʺ to ʺexcellentʺ

Identify the sampling technique used. -A researcher randomly selects and interviews fifty male and fifty female teachers.

Determine whether the numerical value is a parameter or a statistic. Explain your reasoning. -A recent survey by the alumni of a major university indicated that the average salary of 7500 of its 200,000 graduates was $95,000.

Provide an appropriate response. -Explain what bias there is in a study done entirely online.

Identify the sampling technique used. -In a recent television survey, participants were asked to answer ʺyesʺ or ʺnoʺ to the question ʺAre you in favor of the death penalty?ʺ Six thousand five hundred responded ʺyesʺ while 5100 responded ʺnoʺ. There was a Fifty-cent charge for the call.

Identify the data setʹs level of measurement. -ages of students in a statistic class