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Light Bright Warehouse sells boxes of high efficiency light bulbs ($5 box) and switch plates ($10 each). In May, total sales were $42000. Customers bought 5 times as many boxes of light bulbs as switch plates. How many of each did Light Bright Warehouse sell?
If 100 women are randomly selected, find the probability that they have a mean pregnancy between 266 days and 268 days.
Carry out the suitable hypothesis test, at alpha = .05, to find out whether there is a relationship between school/work and stress.
The amount of time a bank teller spends with each customer has a population mean = 3.1 minutes and population standard deviation = 0.4 minute.
Do you think a sample of 25 is large enough to give them the margin of error they want? If not, how large a sample do you suggest they take?
Provide a brief description of the main features of these data from the scatter plot and Describe why you would use performance as the predictor variable and performane related pay as the dependent variable in such a model.
Mr. James McWhinney, president of Daniel-James Financial Services, believes there is a relationship between the number of client contacts and the dollar amount of sales.
The "average" (mean) tire wore out at 41,000 miles, and the standard deviation was 4000 miles. Approximately what percent of the tires are likely to wear out before 40,200 miles?
Set up hypotheses and test to find out whether or not population variance is larger than $100.
How would you communicate this information to the Vice-President of Human Resources in non-statistical language.
A study wants to examine the relationship between student anxiety for an exam and the number of hours studied. The data is as follows:
What is the probability that a random sample of 36 students will have a mean verbal sat score that is great than 535?
It falls into the region of alternative is accepted greater than .95
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