Question 1: lf you are testing a hypothesis that two-population means are the same, you a: should calculate a paired sample t-stat b: should calculate a pooled' standard deviation for t-stat c: should calculate a one sample t-stat d: should not calculate a pooled' standard deviation for t-stat

Question 2:The Australian Energy Market Commission conducted survey about verage cost of electriciy for dometic households from 50 familes had the sample mean $1.5 with asample standard deviation of $2.5. Test the hypothesis that the average cost of electricity for domestic household is $12 and finds a p-alue of 0.179.

At the 5% significance level, the conclusion of the test will be

a: since p-value > 0.05, reject HO

b)since p-value < 0.05, reject HO

c)since p-value < 0.05, accept H0

d)Since p-value > 0.05, do not reject HO

Question 3: A researcher performing a two-tailed related samples (matched pairs) t -test. A total of 15 people is in the sample, before and after measures are taken. the observed t-value for this is 2.25. The level of significance is 0.05. use this P-value = 0.041 to address the correct decision

a: take a larger sample

b: reject the null hypothesis

c: use the z-table instead of the t-table

d: do not reject the null hypothesis