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Revisiting the storage time study
We studied the loss of vitamin C when bread is stored in Exercise 7.76 (page 470). Recall that two loaves were measured immediately after baking and another two loaves were measured after three days of storage. These are very small sample sizes.
(a) Use Table E to ?nd the value that the ratio of variances would have to exceed for us to reject the null hypothesis (at the 5% level) that the standard deviations are equal. What does this suggest about the power of the test?
(b) Perform the test and state your conclusion.
Based on my calculations, what is the arrival and service rate for the express lane with 10 items or less? What is the arrival rate and service rate for the other customers with more than 10 items and what is the average arrival rate and service r..
The annual salaries for Americans are normally distributed with a standard deviation equal to $7,500. Find the following:What percentage of Americans earn below $20,000?
1. identify a commonly used graphical technique for portraying events and relationships among events.2. what does it
question a researcher conducted and experiment on the effects of a new drug on depression. the researcher had a
a. Formulate hypotheses that can be used to determine whether the mean price in New York City differs from $5600. b. A sample of 25 New York City contacts provided the prices shown in the attached file named diamonds. What is the p-value? c. at a = ...
Let X have normal density with mean 1 and variance 9. Find the inflection points of its density.
1. A researcher believed that there was a difference in the amount of time boys and girls at 7th grade studied by using a two-tailed t test. Which of the following is the null hypothesis?
Suppose we want to compare the observed and expected number of events among the group 250 treatments.
The purchase of a coin-operated laundry is being considered by a potential entrepreneur. The present owner claims that over the past 5 years the average daily revenue has been $675 with a standard deviation of $75.
Each vehicle had the gallon of gas added to the empty tank and then driven until empty. Number of miles travelled for all twelve readings are below. Use data to compute the mean and median mileages.
Draw a graph that compares the success rate
A board of directors at the Anchor Pointe Marina is studying the usage of boats among its members. A sample of 30 members who have bots 10 to 20 feet in length showed that they used their boats an average of 11 days last July.
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