Consider the following probability distribution:                                                                                  x         -2       -1       0        1        2                                                                                  P(x)  .12     .09     .25     .30     .24                                                                                  Find the mean of this probability distribution.

A study of binge alcohol drinking by college students was published in the American Journal of Public Health.  Suppose an experiment consists of randomly selecting one of the undergraduate students who participated in the study.  Consider the following events: A: {The student is a binge drinker} B: {The student is a male} C: {The student lives in a coed dorm} Describe the following event in terms of unions, intersections, or complements:    The student is a male and is a binge drinker.

Which of the following is not an element of inferential statistical problems?

What assumption is required for estimating the population mean when we have small samples of n < 30?

The American Angus Association wants to determine the proportion of their members who breed their cows using artificial insemination (AI).  They randomly sample 200 of their members and ask them whether or not they breed their cows using AI.  120 of the 200 members sampled said “yes”.  What are the experimental units?

A bottling company needs to produce bottles that will hold 12 ounces of liquid for a local beer maker.  Periodically, the company receives complaints that their bottles are not holding enough liquid.  To test this claim, the bottling company randomly samples 15 bottles and finds the average amount of liquid held by the 15 bottles is 11.90 ounces and the standard deviation is 0.20 ounces. Using a level of significance of α = 0.05 and a one-tailed hypothesis test, find the appropriate rejection region.

A ________ ________ is a sample statistic, computed from the information provided by the sample, upon which the decision to reject or not reject the null and alternative hypothesis is made.

An ____________ is an object (animal, plant, person, or thing) on which we collect measurements.

A college professor wants to estimate the difference in mean test scores of students who have taken his statistics and genetics classes in the past 10 years.  He selects a random sample of 20 student records from the statistics course and a random sample of 22 student records from the genetics course.  These two samples were independent random samples.  The study provided the results shown in the table below.  Construct a 95% confidence interval for the true difference in population means of these two populations of students.   Statistics Genetics Sample size 20 22 Sample mean 78 75 Sample standard dev. 10 12

The peak shopping time at Rod’s Western Palace is between 8:00 and 11:00 am on Saturday mornings.  The store manager randomly selected 50 customers last Saturday morning and observed their shopping habits.  The manager recorded the number of items purchased by each customer and the total time each customer spent in the store.  Identify the type of variables recorded by the manager.