Stats Help for College-level Students

Statistics

Archaeopteryx is an extinct beast having feathers like a bird but teeth and a long bony tail like a reptile. Five fossil specimens have preserved both the femur and humerus bones. The measurements (in centimeters) for each bone are given below. Femur 38 56 59 64 74 Humerus 41 63 70 72 84 Femur 38 56 59 64 74 ...continues

Regression Interpretation

A manufacturer of a new type of home insulation wants to develop guidelines for builders and consumers regarding the effects on natural gas consumption (1) of the thickness of the insulation in the attic of the home and (2)of the outdoor temperature. In the laboratory they varied the insulation thickness and temperature. A few ...continues

Regression Interpretation: Testing a Hypothesis.

In a multiple regression equation two independent variables are considered, and the sample size is 25. The regression coefficients and the standard errors are as follows. b1=2.676-----sb1=0.56 b2=-0.880----sb2=0.71 Conduct a test of hypothesis to determine whether either independent variable has a coefficient equal to ze ...continues

Statistics

A tire company made a sampling distribution on one of its brands of tires and determined that the tire had a mean life of 56,000 miles with a standard deviation of 18,100 miles. a. What is the probability that the life of a single tire will be less than 50,000 miles? b. What is the probability that the mean life of a sampl ...continues

Statistic Problem

It is estimated that the probability that the general population will live past their 85th birthday is 5.4%. Use the standard normal distribution to approximate this Binomial problem and answer the following questions. Out of a sample of 600, what is the probability that fewer than 30 will live beyond their 85th birthday? ...continues

Regression and hypothesis testing

Fran's Mart are located throughout Erie, Pennsylvania, the owner would like to expand into other communities in northwestern Penn. and southwestern New York. As part of her presentation to the local bank, she would like to better understand the factors that make a particular outlet profitable. She must do all the work herself, ...continues

Regression and hypothesis testing

A mortgage department of a large bank is studying its recent loans. Of particular interest is how such factors as the value of home (in thousands of dollars), education level of the head of household, current monthly mortgage payment (in dollars), and sex of the head of the household (male = 1, female = 2) relate to the family ...continues

Regression and hypothesis testing

Fred is the manager of human resources at St. Luke Hospital. As part of his yearly report to the president of the medical center, he is required to present an analysis of the salaried employees. Because there are over 1,000 employees, he does not have the staff to gather information on each employee, so he selects a random sam ...continues

Determining the probability from a given situation.

A chemical plant has an emergency alarm system. When an emergency situation exists, the alarm sounds with a probability of 0.95. When an emergency situation does not exist, the alarm sounds with a probability of 0.02. A real emergency situation is a rare event, with a probability 0.004. Given that the alarm has just sounded, ...continues

Statistics

Hypothesis testing questions