Inference Procedures
Estimate the true proportion of people who are vegetarian
What is 1 sample z interval
statistic is not random, sampled over 50 individuals and is approximatlty normal. context - 1 sample t test for mew, follows 10% cond
no - not random
first 10 ppl in the store
convineance sampling
What deos mutually exclusive mean
daily double!
the 2 events cant occur at the same time
what is another word for variability
spread
Construct and interpret a 90% confidence interval for the true mean difference in service time
inside and at the drive-thru for this McDonald’s restaurant.
Matched pairs t test for mew d
statistic is random, shows no major skews or outliers and is approximatly normal, context 1 sample t test for mew, follows 10% cond
daily double!
yes
labels 50 individuals , randomly selects 15 using a RNG , identifies the 15 who correspond to the selected ints
SRS
What does independent mean
Prob of one thing doesnt effect the chances of the other thing occuring
mean, median
Do the data provide convincing evidence of an association between race of suspects and the
levels of force used by police officers? Use α = 0.05.
What is Chi Squared test for independence
statistic is random, with 29 individials, not approx normal, context 1 sample t test for mean. follows 10% conditions
no, doesnt fit CLT
systematic random sampling
P(A or B ) = ?
P(A) + P(B) - P(A and B)
name 6 inference proceures
answers may vary, any 6 will get full points
Do the data provide convincing evidence of a linear relationship between the hours of sleep
students typically get and their academic performance, as measured by their GPA?
daily double!
What is Linear Reg t test
statisitc is random, fits CLT and is close enough to being normal, context, one sample t test for mean, follows 10% cond
no, close enough does not make something apporx normal
Distributes 50 people in homogenous groups, runs mini SRS in each
what is stratefied random sampling
P(A and B ) =
P(A) * P(B|A)
name 3 measures of spread
range, IQR, SD
Construct and interpret a 90% confidence interval for the true difference in mean time inside
and at the drive-thru for this McDonald’s restaurant.
Random Statistic without replacement, approx normal and complies to CLT
yes
randomly seelcts one hetrogeneous group from the group of people and samples all in that group
cluster random sampling
what must be true for two events to be independent
P(A) = P(B|A) = P(B|Ac)
daily double!
Explain the difference between binomial and geometric distributions
Geometric - until you get a sucess