Stats Help for College-level Students

Probability

A sample of four different tires is randomly selected from a lot containing 44 that are defective. What is the probability that all four of the tires selected are defective?

Probability Estimation

Of 1037 people who came in to a blood bank to give blood, 330 of them had high blood pressure. Estimate the probability that the next person who comes in to give blood will have high blood pressure.

Solving a Particular Research Question

1). I am conducting research on microscopic toolmark analysis. If I have a toolmark with 27 striations (lines) of varying spatial relationships (orientations), widths and densities, do I use the combination formula to determine the probablity that another toolmark will by chance have a group of at least eight consecutively match ...continues

Determining probability using mean and standard deviation.

A food processing company packages a product that is periodically inspected by the Food and Drug Administration. The FDA has ruled that the company's product may have no more than 2.00 grams of a certain toxic substance in it. Past records of the company show that packages of this product have a mean weight of toxic substance eq ...continues

Determining a relationship between variables and the correlation coefficient.

A real estate broker hoped to develop an equation that could be used to predict the sales price of homes in a certain suburb. It seemed to him that the most important variables, since all the homes were in pretty much the same locale, were age of house, square feet, and number of bedrooms. _ _ X=7.1 Y=90.7 x=0. ...continues

The alternatives to a Chi squared test.

Is there an alternative test to the chi squared test? What if my results give an expected frequency below 5, which stats book states that these should be treated with caution? Is there a more appropriate stat test which would be more accurate in working out the significance of the results?

Explanation of a T-test.

Based on that attached computer printout what do the F, Sig., t, etc tell you? Explain the findings in the attachment.

Working with probability and combinations from a given situation.

In a shipment of 14 computer parts to Indiana State, 3 are faulty and the remaining 11 are in working order. Three elements (parts) are randomly chosen out of the shipment. What is the probability that all three faulty elements will be the ones chosen?

Creating a histogram from a set of data. Attachment in Excel.

A researcher discovers the number of parking tickets that a group of students have received during their driving careers. Twenty students reply and they have received between 9 and 20 parking tickets. Create a histogram (frequency distribution graph) of the data. 9 9 10 11 11 12 12 12 13 13 14 15 16 17 17 17 ...continues

Confidence interval

I would like you to check the first problem, and provide an answer( including values for Standard deviation,Mean,and Sample) #1. Construct a 95% confidence interval for the population mean. Assume the population has a normal distribution. In a random sample of 26 computers, the mean repair cost was $174, with a standard devia ...continues