Question

1. If the confidence coefficient is 2.39. Identify the correct conclusion for this test.
a) Since the test statistic does not fall in the critical region, we do not reject the null hypothesis. There is no difference in the battery lives.
b) Since the test statistic is greater than the confidence coefficient, we do not reject the null hypotheses.
c) Since the test statistic falls in the critical region, we accept the alternative hypothesis.
d) Since the effect size is greater than alpha, we reject the null hypothesis.

2. Identify the factors that will increase power.
a) an increase in the effect size
b) A decrease in the effect size.
c) An increase in the sample size.
d) A decrease in the sample size.
e) An increase to alpha
f) A decrease to alpha
g) Using a one-sided test instead of a two-sided test.
h) Using a two-sided test instead of a one-sided test.

Answer 1

2)

To increase power:

1. Increase alpha
2. Conduct a one-tailed test
3. Increase the effect size
4. Decrease random error
5. Increase sample size

hence

option a), c), e) and g) are correct

Please post question 1 again withe relevant data (critical value ,confidence level, mean,sd etc)