STA 215 final

sample mean of differences

intercept

a

sample size of differences

nd

population mean of group 1

sample mean

coefficent of determination

population mean of differences

sample size

n

sample standard deviation

s

slope

b

population standard deviation

population mean

sample standard deviation of group 1

s1

correlation

r

sample mean of group 1

X-bar is in the middle of your one mean confidence interval.

a. True

b. False

a. True

When n is increased the one mean confidence interval will become wider since there are more

values

a. True

b. False

b. False

All data sets can be modeled by linear regression.

a. True

b. False

b. False

The slope and correlation are always negative or positive at the same time.

a. True

b. False

a. True

If your x and y variables were in the wrong lists (you mixed them up in the calculator somehow)

you would still end up with the same correlation.

a. True

b. False

a. True

What would it mean if you had a negative outcome for: weight of crabs on regular food – weight

of crabs on weight gaining food?

a. The weight of crabs on regular food is higher

b. The weight of crabs on weight gaining food is higher

b. The weight of crabs on weight gaining food is higher

A small group of goldfish were put into a maze to test their memory. The first time the goldfish completed the maze they were not given any enhancing drugs. The second time the same goldfish were given the enhancing drugs. Both times were recorded on how long it took for them to finish the maze. What hypothesis test should be used?

a. t-test

b. two sample t-test

a. t-test

A small group of comet goldfish and common goldfish were put into a maze to see which fish could finish faster. The time it took for them to finish the maze was recorded for both groups.

What hypothesis test should be used?

a. t-test

b. two sample t-test

b. two sample t-test

When do we accept Ho?

a. NEVER

b. When the p-value is higher than the level of significance

a. Never

The degrees of freedom for ANOVA is/are?

a. n-1 for each group

b. ANOVA didn’t have degrees of freedom.

c. The crazy big formula we didn’t have to do

d. There are 3 different degrees of freedom for ANOVA

d. There are 3 different degrees of freedom for ANOVA.

The degrees of freedom for two dependent (paired data) means is?

a. n-1 for each group

b. Just n-1

c. The crazy big formula we didn’t have to do

d. Two dependent means didn’t have degrees of freedom.

b. Just n-1

The degrees of freedom for two independent means is?

a. n-1 for each group

b. Just n-1

c. The crazy big formula we didn’t have to do

d. Two independent means didn’t have degrees of freedom.

c. The crazy big formula we didn’t have to do

Three different types of sharks are being investigated to see how aggressive they are towards

humans. The measurement of aggressiveness is recorded as a numerical variable. What type of

test should you use to see if they have different aggressiveness?

a. t-test

b. two sample t-test

c. ANOVA

d. None of the above

c. ANOVA