In a hypothesis test of one mean, when do we use $t$ instead of $z$?

Identify the hypothesis and conclusion of the following statement. If two planes intersect, then they intersect on exactly one line.

State one possible hypothesis that could be tested using these two setups.

Explain one hypothesis about why dinosaurs might have become extinct.

One possible first step in scientific problem solving is to

a. form a hypothesis.

b. ask a question.

c. test a hypothesis.

d. state a conclusion.

Identify the hypothesis and conclusion of the following statement. If two planes intersect, then they intersect on exactly one line.

Write a hypothesis to explain the adage "one rotten apple spoils the whole bushel."

Select the correct phrase(s) to complete the following statement: A hypothesis is confirmed when: a. one experiment proves the hypothesis b. many experiments validate the hypothesis c. you think your hypothesis is correct

Identify the hypothesis and conclusion of each conditional statement. If two different lines intersect, then they intersect at exactly one point.

In a drawer are two coins. They look the same, but one coin has heads $90 \%$ of the time when spun while the other one has heads only $30 \%$ of the time. You choose one of the coins. You are allowed to spin it once and then must decide whether the coin is the $90 \%$ - or the $30 \%$-head coin. Your null hypothesis is that your coin produces $90 \%$ heads.

a) What is the alternative hypothesis?

Is the following sentence true or false? A gene pool typically contains just one allele for each inheritable trait.

Is it possible to have more than one absolute maximum? Use a graphical argument to prove your hypothesis.

You have read one possible hypothesis about manatees. Write an example of a different hypothesis the scientist could have formed.

Identify the hypothesis and conclusion of the statement. Then write the statement in if-then form. A prime number is only divisible by one and itself.