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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?
When would you use hypothesis testing and when would you use confidence intervals?
I have two samples, one is 31.2% and one is 22.6%. I am trying to calculate the 95% confidence interval in context of this situation. ALso i need the formula that is used to calculate the interval and substitute appropiate numerical values into the f..
Richard is one of test takers. Find out the number of questions he can expect to get right on test by random guessing.
A metropolitan school system consists of three school districts-norths, south, central. The north district contains 25% of all students, the south district contains 40%, and the central district contains 35%.
Determine the probability that the given class period runs greater than 50.75 minutes. Determine the probability of choosing the class period runs greater than 50.75 minutes.
Appalachian Coal mining believes it can enhance labor productivity and therefore net revenue by reducing air pollution in its mines. It estimates that the marginal cost function for reducing pollution by installing additional capital equipment is.
Twelve cases of leukemia are reported in people living in a particular census tract over a 5-year period. Is this number of cases abnormal if only 6.7 cases would be expected based on national cancer-incidence rates?
The average price of a home is reported to be $203,190. Use this price as the population mean, and assume the population standard deviation is 43,890.
Construct a 90 percent confidence interval for the proportion of all depositors who ask for cash back. (Round your answers to 4 decimal places.)
Measures of Central Tendency
A fair coin is tossed four times and X is number of heads on first three tosses and Y on last three. What is the joint probability mass function of x and y? What is the marginal pmf? Are X and Y independent?
Find the mean, median, mode, and midrange for these data.
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