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The U.S. Department of Agriculture reports that the mean American consumption of carbonated beverages per year is greater than 52 gallons. A random sample of 30 Americans yielded a sample mean of 69 gallons. Assume that the population standard deviation is 20 gallons. Let the confidence level be 95%.
a. What is the point estimate of the population mean?b. What is the value of the standard error of the mean?c. What is the value of the confidence coefficient for a confidence interval with the indicated confidence level?d. What is the value of the margin of error for a confidence interval with the indicated confidence level?e. What is the confidence interval with the indicated confidence level for the population mean?
As part of study of the development of the thymus gland, researchers weighed the glands of five chick embryos after 14 days of incubation. Calculate the standard error of the mean.
Assume that the mean parameter θ for the RV L is unknown. To estimate it, a random sample of n = 10 light bulbs is selected, and the lifetime of each light bulb is measured. Let X denote the number of those 10 sampled light bulbs that burn longer ..
Carbon monoxide (CO) emissions for a certain kind of car vary mean 2.4 g/mi and standard deviation 0.7g/mi. A company has 60 of these cars in its fleet. Let y represent the mean CO level for the companies fleet. Estimate the probability that y is ..
if 50,000 parts are produced, how many would you expect to fail to meet a minimum specification limit of 35lb tensile strength? How many would have a tensile strength in excess of 48lb?
Gasoline and number of gallons sold. For sample of 14 stations last Tuesday, correlation was 0.83. At 0.05 significance level, is correlation in population greater than zero?
Operations manager thinks that only 10% of room service orders must take longer than 25 minutes if hotel has good customer service. Does hotel room service fulfil this goal?
Using the sample information given in the above exercise, the p value for testing Ho versus Ha can be calculated to be 0.0057
There are 10 questions on a true-false test. A student feels unprepared for this test and randomly guesses the answer for each of these.
A group of day to day workers can work either 0 hours, eight hours or 12 hours at a pay rate of $9.75 per hour. (The 12 hour day pays regular time for the first eight hours and double time for the remaining four hours.
What can we conclude from this summary, Which of the following statements is correct and In which of the following situations would permutation tests be suitable
Results of study are summarized below. Use a 5% level of significance and test claim that opinion is independent of brand.
Which of the given properties doesn't apply to theoretical normal distribution?
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