Exam 6: Using Probability to Make Decisions About Data

Suzy is about to pick a cookie from a cookie jar.The cookie jar contains 4 chocolate chip, 3 vanilla, 2 ginger snap, and 1 sugar cookie.What is the probability that Suzy will not pick a vanilla cookie?

Your professor told the class that, typically, 20% of the class receives As, 20% Bs, 35% Cs, 10% Ds, and 15% Fs.What is the probability the student sitting next to you will receive an A or an F? Put your answer in the form of a proportion.

The mean of the population $\sigma_{X}^{2}=100$ $(\mu)$ is 200 on a test measuring math skills of middle school students.The variance is .The test scores for the students in Mr.Petri's class at Suburban Middle School are given below.Use a rejection region with a probability of 5% only in the upper tail.What is the standard error of the mean?

A study about the college aptitude of seniors at North City High School has resulted in a sample mean with a corresponding z-score of ?2.00.If the critical value for the region of rejection is $\pm 1.96$ , what is the correct conclusion?

The introductory biology class at State University is conducting a study of water quality in their local community.The population mean of a certain beneficial bacteria found in drinking water $\mu=$ 100, with $\sigma_{x}=25$ The bacteria counts from the community are given below.Use a two-tailed rejection region with a total area of 0.01.What is the standard error of the mean?

Which of the following best describes knowing the relative frequency of every possible event in a population?

What is the typical criterion probability used by researchers?

Professor White felt that he had a representative sample--but he starting to wonder if he really did.Briefly note what might make Professor White feel this way.

When does sampling error occur?

What can you conclude about a sample mean falling within the region of rejection?

Which of the following is not a step when deciding whether or not a population is being represented?

The range of probabilities

An event's relative frequency in the population equals

If your critical value is ±1.96 and your z-value is -2.44, do you reject the sample mean represents the underlying population or not?

Which of the following is correct regarding means falling within the region of rejection when the critical values are $\pm 1.96 ?$

Consistent with the basic premise of a representative sample, if a given population consists of 60% women, your sample should have

What is the essence of all inferential statistics?

What do we call the portion of the sampling distribution in which values are considered too unlikely to have occurred by chance?

What is the probability of a sample mean below z = +1.2?

The mean of the population $\sigma_{X}^{2}=100$ $(\mu)$ is 200 on a test measuring math skills of middle school students.The variance is .The test scores for the students in Mr.Petri's class at Suburban Middle School are given below.Use a rejection region with a probability of 5% only in the upper tail.What is the z-value?