A coin has been flipped 20 times in a row and landed on heads each time. Kirby bets all his savings that this time it must land on tails. What is the probability of the coin landing on tails?

Which of the following statements about power is false?

Even if a treatment has an effect, it is still possible to obtain a sample mean that is very similar to the original population mean.  What outcome is likely if this happens?

The critical boundaries for a hypothesis test are z = +1.96 and 1.96. If the z-score for the sample data is z = 1.90, then what is the correct statistical decision?

A vertical line is drawn through a normal distribution at z = 1.20.  What proportion of the distribution is on the left-hand side of the line?

A sample of n = 25 individuals is selected from a population with µ = 80 and a treatment is administered to the sample.  What is expected if the treatment has no effect?

What proportion of a normal distribution is located in the tail beyond z = –1.00?

On Halloween, Oprah puts candy out in a bowl – there are 20 Reese’s, 25 Junior Mint boxes, and 15 Laffy Taffys. When the first trick-or-treater comes by, what is the probability they choose a Junior Mint Box?

What z-score values form the boundaries for the middle 60% of a normal distribution?

What proportion of a normal distribution is located between z = –1.50 and z = +1.50?