Stats Help for College-level Students

Comparing two populations

While it cannot be denied that advertising impacts sales, it is also true that advertising is expensive and companies want to advertise in ways that have the greatest benefit for the amount of money spent. A company that sells snack food designs two different advertising strategies, one focusing on print media and the other on r ...continues

Inferences: One population

A portion of the data file for the hospital that collected the data on hand washing is shown below: Observation Unit Time 1 Time 2 1 CCU 3 16 2 CCU 2 7 3 CCU 0 5 4 CCU 5 8 5 CCU 2 15 6 CCU 0 15 7 CCU 2 20 8 CCU 3 16 9 CCU 0 18 10 IMCU 1 16 11 ...continues

Can the hypothesis be rejected?

A food processor is concerned that the 16 oz. can of sliced pineapple is being overfilled. The quality control department took a random sample of 50 cans and found that the arithmatic mean weight was 16.05 oz., with a sample standard deviation of .03 oz. At the 5% significance, can the hypothesis that the mean weight is equal ...continues

Describe the problem framing process

Describe the problem framing process?

What is the question to be answered?

Question: What is the question to be answered in completing this problem? ___________________________________________________ Most traffic lights are set so that there is enough time for pedestrians to cross the road safely. A recent study indicates that a large number of elderly cannot get across the road in the usual 15 sec ...continues

Data elements

Questions: List the data elements you are provided. How do you use these data elements to determine how to solve the problem? ___________________________________________________ In an attempt to improve quality many manufacturers are developing partnerships with their suppliers. A local fast-food burger outfit has partnered ...continues

Hypothesis Testing

In an attempt to improve quality many manufacturers are developing partnerships with their suppliers. A local fast-food burger outfit has partnered with its supplier of potatoes. The burger outfit buys potatoes in bags that weigh 20 lb. It wished to set up the null and alternative hypothesis to test if the bags do weigh on th ...continues

Hypothesis testing

Most traffic lights are set so that there is enough time for pedestrians to cross the road safely. A recent study indicates that a large number of elderly cannot get across the road in the usual 15 seconds allowed. To determine the average amount of time it takes senior citizens to cross the street, a study was taken of 25 sen ...continues

Hypothesis testing

Every year the Wall Street Journal has a feature on compensation of CEOs of different companies. The data include type of company, amount of salary, amount of bonus, % change from the previous year, and several other compensation forms. A sample of the data is shown in the table. (SEE ATTACHED TABLE!) a). Look at the 1996 ...continues

Hypothesis Testing

A local fast-food burger outfit has partnered with its supplier of potatoes. The burger outfit buys potatoes in bags that weigh 20 lb. It does not wish to accept underweight bags of potatoes. A sample of 40 bags shows an average weight of 19.95 lb. with a standard deviation of 0.1 lb. a) Set up the null and alternative h ...continues