Sampling randomly (carefully)
Type of sample that gives everyone in a population an equal chance of being selected for the sample.
What is a random sample?
You ask one person who has mud wrestled to respond to your survey and ask them to suggest other mud wrestlers who might be willing to respond to your survey.
The type of hypothesis that says 'nothing to see here' or 'nothing going of here' (in everyday language)
What is the NULL hypothesis test?
Acc'd to the CLT, the shape of the distribution of sample means takes on this shape.
What is 'normal?'
The purpose of a confidence interval
What is: Use a sample mean to estimate a population mean (also need standard error)
A sample selects every 20th person on a list of everyone in the sampling frame.
What is a systematic random sample?
You hang out at a health fair in a local park and ask people if they will respond to your survey about the COVID vaccine.
What is a convenience sample?
True or false: Sometimes a hypothesis simply cannot be tested.
False! (if it can't be tested, it's not a hypothesis.)
True or false: A normal curve is not so different from a histogram that has a symmetric, bell-shape
What is 'true?'
1.96
What is the number of units of standard error needed to create a 95% confidence interval?
Chance of being selected for a simple random sample if there are 500 people in the population and the sample will be 50 people?
What is 1 in 10, or .10 or 10%?
You get permission to survey people outside a pet store to ask people how they cope when their pet is ill.
What is a convenience sample?
Of null and alternative, the type of hypothesis testing that the research actually tests (technically)
What is the NULL hypothesis?
The statistic that expresses the average amount that sample means deviate from the population mean.
What is 'standard error?'
Standard error if n = 100 and standard deviation = 63
What is 6.3
Sample type that decides on groupings in the population and groups people before randomly sampling from each group
Stratified random sampling
You figure out who you should talk to in order to get an accurate picture of a local planning issue.
What is a purposive sample?
Type of error: There is something going on in the population that the sample was drawn from, but the research did not find it.
What is Type II error?
The larger of the two, the mean of the sample means or the population mean. (Might be a trick question.)
What is 'Neither; they're the same.' (Theoretically)
The percentage of possible pop. means included in c 90% confidence interval.
90% of them
The two ways (generally speaking) that the number of people in each strata (group) of a stratified random sample can be determined.
Proportional (to the population) and disproportional
Which is the best, a convenience sample, a purposive sample, or a snowball sample? (might be a trick question)
The best type of sample is the one that will help get good data to answer a question. None of these are necessary better than the others.
The value (a probability) that researchers use as criteria for rejecting a null hypothesis
What is the alpha level?
The formula for standard error
What is population standard deviation divided by the square root of the sample size?
The thing to explain about precision and accuracy when it comes to standard error.