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Question: Previous small study was investigating the total cost of 10 specific items of fruits and vegetables which were sold in 3 supermarkets compared to that were sold in 3 local corner shops. On average the total cost of 10 specific items of fruits and vegetables which were sold in local corner shops was £5.50. It was suggested that the total cost of those fruits and vegetables which were sold in supermarkets was 50% cheaper than the local corner shops, with a common standard deviation of 1.65. Use the PS power calculator to find out how many supermarkets and local corner shops are required (assume equal group), if we are going to conduct a similar study to investigate the difference in cost of this size, with 90% power and using a 1% significance level?
Barbara Flynn is in charge of maintaining hospital supplies at General Hospital. During the past year, the mean lead time demand for bandage BX-5 was 60 (and was normally distributed).
Test the hypothesis that the true Pearson correlation (p) is significantly different from zero. Provide a (p) value (two-tail) n=12. Correlation intake is .448 for the two recording methods.
Let"s redesign the Steak experiment so that in addition to 4 packaging methods, we have two storage temperatures -- Low, High. We have 16 steaks available. How do we randomly assign them?
If employee is chosen at random, determine the probability that employee is female and salaried staff? Choose the best answer from the following.
seventy percent of married couples paid for their honeymoon themselves. you randomly select 20 married couples and ask
A sample of 50 customers resulted in a sample mean of $90. What is the probability of obtaining a sample with a sample mean smaller than $90?
If these two assumptions are correct, then what is the probability that the sample mean waiting time,T, based on your random sample of size n=36, will exceed 104 hours?
Create a scatter diagram and consider the correlation for the given data. Create a scatter diagram and sketch the line you think best fits the data.
In a large metropolitan area, past records revealed that 30 percent of all the high school graduates go to college. Each student's choice to go to college is independent. From 20 graduates selected at random, what is the probability that exactly 8 wi..
Suppose that in fact 8% of the apples on the truck do not meet the standards. What is the probability that the shipment will be accepted anyway?
the thickness of a laminated covering for a wood surface is normally distributed with a mean of 5 millimeters and a
What is the underlying difference between the T-test and the Z-test? Provide an example of nominal information and write a work related survey question that would collect nominal data:
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