STT 231 Test 2 Questions and Answers | 2026
Update | 100% Correct
first condition of hypothesis test
10 successes/failures
second condition of hypothesis test
independence of data points
if value is contained in interval
accept null, p-val greater than significance level
if value NOT contained in interval
reject null, p-val smaller than significance level
chi sq goodness of fit
1 categorical variable follows proposed distribution
chi sq center
df
df
(rows-1)(columns-1)
chi sq intependence test
, 2 categorical variables
expected count
row total x column total / table total
H0 of independence test
variables are independent
HA of independence test
variables are associated
chi sq test stat
(obs - exp)2 / exp
interpretation of p-value with chi sq
probability of witnessing test stat or higher under assumption H0 is true
increasing n
df stays same
test statistic increases
increasing n
ANOVA
Update | 100% Correct
first condition of hypothesis test
10 successes/failures
second condition of hypothesis test
independence of data points
if value is contained in interval
accept null, p-val greater than significance level
if value NOT contained in interval
reject null, p-val smaller than significance level
chi sq goodness of fit
1 categorical variable follows proposed distribution
chi sq center
df
df
(rows-1)(columns-1)
chi sq intependence test
, 2 categorical variables
expected count
row total x column total / table total
H0 of independence test
variables are independent
HA of independence test
variables are associated
chi sq test stat
(obs - exp)2 / exp
interpretation of p-value with chi sq
probability of witnessing test stat or higher under assumption H0 is true
increasing n
df stays same
test statistic increases
increasing n
ANOVA
