In a study about proportions, which distribution is used?(write t or z)

Group of answer choices

z

z-distribution

Question 2

How many degrees of freedom are there for a sample of size 24?

Question 3

An organization claim that teenagers spent 4.5 hours per week, on average, on the phone.Fifteen randomly selected teenagers had a mean time of 4.75 hours with a sample standard deviation of 2.0.Conduct a hypothesis test.

What is the null and alternative to run a hypothesis test?

Question 4

Always assume the____________________________ hypothesis is true.

Alternative

Null

Question 5

We fail to reject the null when the test statistic falls in the__________________________________ region.

Critical

Non-critical

Question 6

Students collected the weights of a random sample of 24 Chips Ahoy! cookies.They want to perform a test ofH0;=11HA;11

H0;=11HA;11at=0.05. =0.05significance level.The sample of 24 cookies had a sample mean weight of 11.063 grams and a sample standard deviation of 0.562 grams.Calculate the test statistic (step 3) and round to 3 decimals.

Question 7

When a confidence interval is not state, use a 90% confidence level.

Group of answer choices

True

False

Question 8

The _____________________________ hypothesis includes equality.

Null

Alternative