(i) state the name of relevant hypothesis test: – one sample z-test for proportion – one sample t-test for mean – matched pairs t-test for mean of difference – independent two sample t-test for difference of means – independent two sample z-test for difference of proportions

(ii) define parameter(s) of interest and state the null and alternative hypotheses.

example : to test the claim that startbucks coffee’s daily sale in twin cities is higher than that in des moines, ia, you randomly select 30 stores from each location and calculate the sample daily sales mean for each state.

answer : independent two sample t-test for difference of means. µ1: mean daily sale of startbucks coffee’s in twin cities µ2: mean daily sale of startbucks coffee’s in des moines, ia h0 : µ1 = µ2 vs h1 : µ1 > µ2

e. an experiment investigated whether cell phone use impairs drivers’ reaction times, using an sample of 64 students from the university of utah. students were randomly assigned to a cell phone group or to a control group, 32 to each. on a simulation of driving situations, a target flashed red or green at irregular periods. participants pressed a brake button as soon as they detected a red light. the control group listened to radio or audio book while they performed the simulated driving. the experiment measured each group’s mean response time over many trials.