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The owner of a mail-order catalog would like to compare her sales with the geographic distribution of the population. According to the United States Bureau of the Census, 21 percent of the population lives in the Northeast, 24 percent in the Midwest, 35 percent in the South, and 20 percent in the West. Listed below is a breakdown of a sample of 400 orders randomly selected from those shipped last month. At the .01 significance level, does the distribution of the orders reflect the population?
Region Frequency
Northeast 68
Midwest 104
South 155
West 73
Total 400
If a blue ball is selected you win nothing. Let X be the amount that you win. The expected value of X and let the random variable X be a random number with the uniform density curve given below
To investigate he selects a sample of eight weeks and determines the number of new cars sold and the number of sales people on duty for that week. a) What are the dependent and independent variables?
Carry out suitable multiple comparison procedure to determine the source of the difference.
First-order regression model was fit to data. Part of printout follows?
As a quality engineer working on the Rangdo production line, you have determined that the probability of producing a defective part is 6%.
In a normal frequency distribution, 32% of the cases:
A car rental company has determined that the probability a car will need service work in any given month is 0.2. The company has 900 cars.
The Sony corporation produces a Walkman that requires two AA Batteries. The mean life of these batteries in this product is 35.0 hours. The distribution of the battery lives closely follows the normal probability distribtion with a standard deviat..
Please perform a hypothesis test using a .05 significance level on the following information. Next please perform a regression analysis as well as providing a scattered diagram.
Summarize the relationship between sample size and confidence level.
Test out an suitable hypothesis also state your conclusion. Make sure the suitable assumption as well as conditions are satisfied before you proceed.
If the sales are $150,000 per month, determine how much the company can expect to receive of this amount.
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