Statistics:Sample Exam

What is equivilant to a x² test of independence for a 2×2 case?

Independent group proprtions z-test

independent samples

A study was conducted to compare the effectiveness of two weight loss strategies for obese participants. The proportion of obese clients who lost at least 10% of their body weight was compared for the two

strategies. The resulting 98% confidence interval is (-0.13, 0.09). Give an interpretation of this confidence interval.

B. We are 98% confident that the population proportion of obese clients losing weight under strategy 1 is between 13% less and 9% more than the population proportion of obese clients losing weight under

A survey asked respondents "When a person has a disease that cannot be cured, do you think doctors should be allowed by law to end the patient's life by some painless means if the patient and his family

request it?". In testing Ho: PM =PF versus Ha: PM >PF, where PM is the proportion of males who responded "yes" and pF is the proportion of females who responded "yes", suppose the z statistic is 1.80 and

the p-value is 0.0359. What is your conclusion using a significance level of 0.05?

A. Since the P-value is less than a, we reject the null hypothesis and conclude that the percentage of males holding this belief is greater than the percentage of females.

If two quantitative variables have a positive correlation, what can we predict about the sign of the slope in a multiple regression using those two variables?

it could be positive, negative, or 0

0.25; those who were vaccinated were 0.25 times as likely to contract the flu as those in the control group

A

m1P1, n1 (1-P1), n2P2, n2 (1-P2) must all be at least 10

It is the observed value of the response variable for the ith observation in the population.

two-sample t-test

B. u1-u2, bar X1-bar X2, t

Since all of the values in the confidence interval are greater than 0, we can conclude that the percentage of males who believe that doctors should be allowed by law to end the life of a patient with an

incurable disease by some painless means if the patient and his family request it is greater than the percentage of females who share the same belief.

type of institution,two-sample t-test

Compound,one-way ANOVA

H ₀ :pij=pi x pj,at least 1 pij does not equal pi x pj

13

A

20688

53

88.0

B

-1.39

0.1674

D

B

0.0250

C

E

-1.73

0.0836

A

1.96

2.042

LB:-3.842,UB:0.242

D

1.6

0.2640

C

A

0.328

D

A

E

-4.8

-2.89

9

C