exma Flashcards
one disadvantage to histograms
dont preserve original data
a histogram of ACT scores for everyone would likely look like what?
a normal distribution
1-6 spinner. a histogram of 500 spins likely shows
a uniform distribution
which measure is most resistant to outliers
median
the distribution of populations of cities in the US is skewed right. the best summary of the datas center and spread is
the 5 number summary
if the best plot of a variable is a pie chart which is true about the variable
a bar chart can also display the data well
what do we know about density curves
the area is always one
what best describes the standard normal curve (symmetric or skewed, mean, SD)
symmetric mean= 1 SD=0
which is an effective sampling design
multistage
most serious type of bias in sampling
nonresponse
to reduce variability
take a larger sample size
to reduce bias
improve our population list
events are mutually exclusive if
they do not have ay outcomes in common
for the same values of n and r what is true about permutations and combinations
the number of permutations is generally larger
the statement we generally like to prove
alternate hypothesis
