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A survey found that Americans generate an average of 17.2 pounds of glass garbage each year. Assume the standard deviation of the distribution is 2.5 pounds. Find the probability that the mean of a sample of 55 families will be between 17 & 18 pounds.
Establish a 99% confidence interval for the difference in the proportion of suburban and urban housewives who own IPod.
The intelligence Quotient test scores normally distributed with a mean of 100 and a standard deviation of 15.
We want to estimate the population mean within 5, with a 99 percent level of confidence. The population standard deviation is estimated to be 15. How large a sample is required?
A market analyst for the Weber Refrigerator Company has visited various appliance stores in a city to get data on the selling price of different brands of refrigerators. Estimate the population regression equation and interpret the result
The distribution of sample mean for samples of 500 homes is normal with a mean of 2.64 and a standard deviation of 0.06. Suppose you select a random sample of n=500 homes and determine that the mean number of people per home for this sample id 2.5..
A high school counselor is interested in the percentage of students who will be going to college. She randomly picks 60 students and finds that 53 will be going to college. Use a 95% confidence level to find the population proportion.
Using the .05 level, do the results support the researcher's theory? (a) Use the steps of hypothesis testing, (b) sketch the distributions involved.
Based on these results, the proportion of the variation in 1993 winnings that is explained by the average number of putts per round and driving distance
Randomly selected nonfatal occupational injuries and illnesses are categorized, according to the day of the week that they first occured, and the results are listed below.
Critically discuss the lower control limit for a proportion defective if the average daily production is 5000 units and the average fraction defective is .02?
The salaries of the employees of a corporation are normally distributed with a mean of $25,000 and a standard deviation of $5,000.
Find a 99% confidence interval for the difference in the mean number of calls between night and day.
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