QUESTION 7: If a 95% confidence interval is constructed to test for a difference in two dependent samples the result is (0.2kg< _d<2.1kg). If the same data is treated as independent samples the resulting 95% CI is (-2.7kg<₁-₂<5.0kg). What is the key difference in the interpretation of these two intervals?

The CI for the dependent samples does include 0, so there is a significant difference between the two means. However, the independent sample means do not show a significant difference since the interval does not include 0.

The CI for the dependent samples does not include 0, so there is a significant difference between the two means. However, the independent sample means do not show a significant difference since the interval does include 0.

The CI for the dependent samples does not include 0, so there is not a significant difference between the two means. However, the independent sample means do show a significant difference since the interval does include 0.

Choose any one:_______________.

QUESTION 8: If testing for a significant difference between two means of independent samples, what about the confidence interval would prompt you to Reject Ho?

Reject Ho if the confidence interval does include 0.

Reject Ho if the test statistic falls in the rejection region bordered by the critical value.

Reject Ho if the confidence interval does not include 0.

Reject Ho if the p-value is less than or equal to alpha.

Choose any one:_______________.

QUESTION 9: The mean life span of random sample of 30 large bread dogs is 9.8 years with a st.dev. of 1.6 years. The mean life span of a random sample of 45 small breed dogs shows a mean life span of 14.2 years with a st dev of 2.8 years. Calculate the 80% confidence interval for the difference in the life spans to determine if there is evidence to suggest that the large breed dogs have a shorter life span than small breed dogs?

(-5.059, -3.741) Since interval is below zero, there is not evidence that large breed dogs have a shorter life span than small breed dogs.

(-5.059, -3.741) Since interval is below zero, there is evidence that large breed dogs have a shorter life span than small breed dogs.

(-5.053, -3.747) Since interval is below zero, there is not evidence that large breed dogs have a shorter life span than small breed dogs.

(-5.053, -3.747) Since interval is below zero, there is evidence that large breed dogs have a shorter life span than small breed dogs.

Choose any one:_______________.

QUESTION 10: A sample of 5 waiters shows the total tips on weeknights compared to Friday/Saturday nights.

Weeknight (min): 70, 60, 65, 90, 75

Friday/Saturday (min): 68, 67, 72, 120, 81

Is there evidence at the 8% level of significance to suggest that Friday/Saturday night tips are higher than weeknights?

t=-.859, p-value=0.212, Fail to Reject Ho. There is not sufficient evidence to suggest that Friday/Saturday night tips are higher than weeknights.

t=-1.787, p-value=0.074, Reject Ho. There is sufficient evidence to suggest that Friday/Saturday night tips are higher than weeknights.

t=-.859, p-value=0.788, Fail to Reject Ho. There is not sufficient evidence to suggest that Friday/Saturday night tips are higher than weeknights.

t=13.987, p-value=0.999, Fail to Reject Ho. There is not sufficient evidence to suggest that Friday/Saturday night tips are higher than weeknights.

Choose any one:_______________.