Conditions for Tests
The first condition
What is a Simple Random Sample?
The condition that states there are only two outcomes.
What is the binary condition?
A researcher has a population of 100 third grade children from a local school district from which a sample of 25 children is to be selected. Each child's name is put on a list, and each child is assigned a number from 1 to 100. Then the numbers 1 to 100 are written on separate pieces of paper and shuffled. Finally the researcher picks 25 slips of paper and the number on the paper determine the 25 participants.
What is a simple random sample?
The difference between the maximum and minimum values of a data set.
What is the range?
Collects data for all individuals in a population.
What is a census.
The second condition
What is the 10% rule?
The third condition of a binomial setting.
What is the number of fixed trials condition?
Supposed 1,000 iphone's are produced at a factory today. Management would like to ensure that the phones display screens meet their quality standards before shipping them to retail stores. Since it takes about 10 minutes to inspect an individual phone's display screen, managers decide to inspect a sample of 20 phones from the day's production. An eager employee suggests that management inspect the last 20 iphone's that were produced today.
What is a convenience sample?
For each increase in height of one unit, the volume is expected to increase by approximately X.
What is the slope?
A systematic tendency to favor certain responses over others.
What is a bias?
The third condition for a mean test
What is normal by CLT?
The second condition of a binomial setting.
What is the independent condition?
The ABC program Night line once asked whether the United Nations should continue to have its headquarters in the United States. Viewers were invited to call one telephone number to respond 'yes' and another for 'no'. More than 186,000 callers responded.
What is a voluntary sample?
The average distance from the mean. It cannot be negative.
What is the standard deviation?
Shows relationship between two quantitative variables measured on the same individuals.
What is a scatter plot.
The third condition for Chi-squared test
What is are Expected Counts greater than or equal to 5?
The distribution models the number of successes in a fixed number of trials.
What is the binomial distribution?
A sample of 2,000 was sought to estimate the average achievement in science of fifth graders in a city's public schools. The average fifth grade enrollment in the city's elementary schools is 100 students. This , 20 schools were randomly selected and within each of those schools all fifth graders were tested.
What is a cluster sample?
"Standardizes" data. It is the number of standard deviations from the mean of the data set.
What is a Z-Score?
Helps explain or predict changes in response variable.
What is the explanatory variable?
The third condition for a proportion test.
What is large counts?
The condition that states the probability of success is the same for each trial.
What is the success condition?
A sociologist conducts an opinion survey in a major city. Part of the research plan calls for describing and comparing the opinions of four different ethnic groups: African Americans , Asian Americans, European Americans, and Native Americans. For a total sample of 300, the researcher selects 75 participants from each of the four predetermined subgroups.
What is a stratified sample?
"Fake" treatment that is similar to the treatments being tested.
What is a placebo?
Another Variable that is related to the explanatory variable and influences the response variable and may create a false perception of association between the two.
What is a confounding variable?