Final Flashcards
(29 cards)
what is parameter?
calculation from population
what is statistic?
calculation from sample
what is census?
collection of data from ALL people in a population
what is stratified sampling?
put into groups (ethnic, eye colour), then randomly select from each group
what is cluster sampling?
divide population into groups, then choose only a few groups
what is convenience sampling?
ask people who are around (worst kind)
what is multistage sampling?
combo of stratified and cluster; random groups then a few from each group
what is discrete quantitative data?
a count that can have specific values
what is continuous quantitative data?
data obtained through measurement
what is ordinal qualitative data?
data with natural order
what is nominal qualitative data?
data without natural order
what is variance?
the square of standard variation
what is mean?
sum of all observations divided by the number of observations
what is median?
middle score
what is mode?
most frequently occurring score
what is range?
the difference between the highest and lowest scores
what are the 4 checks to find if its a binomial distribution?
- fixed number of trials: n =?
- the trials are independent
- 2 outcomes: success =? | failure = ?
- same chance success
true or false?
if np >= 5 and nq >= 5 the binomial distribution can be approximated by a normal distribution
TRUE
what is p?
population proportion
what is P^ hat?
sample proportion
if p-value <= alpha then?
reject H null
if p-value > alpha then?
fail to reject H null
what are the 2 conditions for sample means? (hypothesis test)
- simple random sample
- n>= 30 or normal population
what is a type 1 error?
occurs if you reject a null hypothesis that is actually true
