Stats Help for College-level Students

Expected value

Calculate the e-time that an arriving pedestrian must wait until crossing. See attachment.

Probability using Normal Distribution: What is the probability that a random sample of 9 sections of pipe will have a sample mean diameter between 1.009 inches and 1.012 inches?

PVC pipe is manufactured with a mean diameter of 1.01 inches and a standard deviation of 0.003 inches. What is the probability that a random sample of 9 sections of pipe will have a sample mean diameter between 1.009 inches and 1.012 inches? Assume the central limit theorem holds.

Probability

X follows a normal distribution with mean 20 and standrad deviation 4. Find b such that Prob(-b<=X-20<=b)=0.95

Probability

In a game at a fraternity party, there are 10 bottles to knock down. Five fraternity brothers line up to shoot the bottles down, each a perfect shot. Each brother selects one bottle at random and shoots. Find the e-value of your distribution of the number of bottles knocked down. Each brother is a perfect shot so the probabi ...continues

Hypothesis Tests

Problems are attached in word format. The questions are posted below to provide quicker review. Thanks, Q1) Does gender impact the use of electronic mail (e-mail)? An insurance company studied the use of e-mail in its organization by counting the number of business-related e-mails generated by 10 men and 10 women matched o ...continues

Test statistics and ANOVA test using Excel

1.What are the assumptions regarding a small two sample t-test and what Excel aid would you use to perform the test, Data Analysis or MacDoIt? 2.What are the assumptions regarding an ANOVA test and what Excel aid would you use to perform the test, Data Analysis or MacDoIt? 3.What are the assumptions regarding a Chi-squar ...continues

Probability Question

A major department store chain is planning to open a store in a new city. Five cities are being considered: Boston, Atlanta, Dallas, Cleveland, and Los Angeles. A. List the simple events associated with this experiment. B. Assign a probability to each simple event; assuming each city has an equal chance of being selected. ...continues

Statistics Problem

Please help me with the following problem: The city of a particular community consists of five elected residents of the community, two of whom are land developers. The city mayor plans to elect two members at random from the council to study and make recommendations on land use rezoning requests. The composition of this su ...continues

Statistics and Probability

A retail grocer has decided to market organic "health food" and will purchase a new line of products from each of two suppliers. Unknown to the grocer, the two suppliers are in financial distress. Past experience has shown that, for firms with similar credit histories, the probability that bankruptcy will be initiated one year ...continues

Probability Problem

Epidemiologists at a medical center in the Northeast are interested in the etiology of anthracosis ("Black lung" disease), caused by the inhalation of coal dust. All the coal miners in a particlar cummunity were screened and classified according to their length of employment in the coal mines and whether symptoms of anthracosis ...continues