Stats Test 2/4/20

A sample should contain a minimum of...

30 Paritcipants

Ms. Nichol samples her class by selecting all students sitting at group 1 and group 5 in her classroom. This sampling technique is called?

Cluster

A situation that occurs when an experimenter cannot tell the difference between the effects of the different factors on a variable

Cofounding Variable

The group of participants who do not receive a treatment.

Control

The process of making sure there are no outside factors that are affecting the outcomes of the experiment is called...

Control

A sample that consists only of available members of the population

Convenience Sample

True or False: all samples lead to a good prediction about an entire population.

False

Sage wants to know which recreational activity is most popular in Heard County. Which survey question is the least biased prompt for collecting this data?

How do you like to spend your free time?

Assigning treatment groups by pairing subjects according to a similarity. One subject in the pair is randomly selected to receive one treatment while the other subject receives the other treatment

Matched Pairs Design

To determine whether sugar affects an athlete's performance at practice, Coach Barron gave half the team doughnuts for breakfast and the other half whole grain cereal. He compared the two groups in terms of endurance and energy. This is an example of:

Observational Study

Assigning treatment groups by dividing participants into blocks of subjects with similar characteristics and then within each block you randomly assign subjects to treatment groups

Randomized Block Design

To ensure that the experiment results are valid it is important that the experiment be...

Replicated, controlled, and randomized

The process of repeating an experiment under the same or similar conditions is called...

Replication

To study the amount of time students spend doing homework each day, use a random number generator to select 25 students from the student enrollment database to survey.

Simple Random Sample

What type of sampling is this? Soybeans are planted on a 48-acre field. The field is divided into one acre subplots. A sample of plants is taken from each subplot to estimate the harvest.

Stratified Random Sample

To find out what the preferred ice cream flavor is, wait outside an ice cream parlor and ask every 4th person leaving the store to name his or her favorite flavor until you get 25 responses is an example of...

Systematic Sample