Questions for 3-9

Question 1

If our alternative hypothesis is non-directional, we will

Answer 1

split our alpha and put one half in the upper tail and the other half in the lower tail of the sampling distribution

Question 2

A psychiatrist believes that she has developed a technique that will reduce the amount of time patients with schizophrenia spend in an institution. Currently, the average amount of time such patients spend in the institution is 85 weeks, with a standard deviation of 12 weeks. She randomly selects 20 patients with schizophrenia to test her new method, and will compare the mean of this group to the population mean. Given the nature of her study, which of the following would be the best null hypothesis

Answer 2

Patients exposed to the new therapeutic technique will be institutionalized for 85 weeks or longer than 85 weeks

Question 3

A researcher collects information on the height of every single US president to look for a correlation between height and success as president. In this case, presidents would be

Answer 3

population

Question 4

The purpose of descriptive statistics is to

Answer 4

organize and summarize observations so that they are easier to understand

Question 5

A random sampling method ensures that

Answer 5

Every individual has an equal chance of being selected for a sample

Question 6

If we are sampling from a deck of 52 playing cards with replacement, what is the likelihood of pulling any spade card out of the deck (there are 13 spade cards in a deck), or the king of diamonds?

Answer 6

14/52

Question 7

Events are considered mutually exclusive when

Answer 7

The occurrence of one event prevents the occurrence of any other event

Question 8

The expected mean of any sampling distribution should

Answer 8

Be the same as the mean of the population from which the samples are drawn

Question 9

When talking about sampling distributions, what would be the best way to describe the standard error of the mean?

Answer 9

the standard deviation of a sampling distribution

Question 10

Imagine we have two populations: one is normally distributed and the other is skewed. If we made sampling distributions with n=100 for each distribution, central limit theorem would predict

Answer 10

both sampling distributions will approach a normal shape

Question 11

We want to compute the standard error of the mean s_{\overline{x}}=\frac{s_{x}}{\sqrt{n}} for a sampling distribution. Which of the following sample sizes would give us the smallest standard error

Answer 11

60