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1. What is the difference between a one-tail and a two-tail test? How do we identify each?
2. What is meant by a p-value?
3. A basketball player has hit on 60% of her shots from the floor. If on the next 100 shots she makes 70 baskets, would you say her shooting has improved? Use a .05 level of significance.
4. An electrical firm manufactures light bulbs that have a length of life approximately normal with a mean of 800 hours and a standard deviation of 40 hours. Test, at a .05 level of significance, whether or not a sample of 36 bulbs with an average life of 788 hours has a µ equal to 800 hours.
She believes that the number of customers served on weekdays follows a normal distribution. Construct an 99% confidence interval of the average number of customers served on weekdays.
A company makes molded plastic toys. They study the plastic injection process into the molds. A common cause of variation and What are the control limits for an chart
Find the probability that a random selection of 9 songs will have mean length of 186.30 seconds or less. Assume distribution of the lengths of the songs is normal.
Can students save money by buying their textbooks at Amazon.com? To investigate this possibility, a random sample of 15 textbooks used during the Spring 2007 semester at Iowa State was selected.
would this prove that they are exceeding their goal, using α = 0.025?
Start rolling dice until a particular number, say 3, is obtained, and keep track of how many rolls are necessary. Repeat 100 times. Then find the average.
A random sample of 15 observations from the first population revealed a sample mean of 350 and a sample standard deviation of 12. A random sample of 17 observations from the second population revealed a sample mean of 342 and a sample standard dev..
Two years ago, a survey of all Wal-Mart customers indicated that the mean number of items bought per day by male customers was 8.3 with a standard deviation of 3.7.
A researcher predicts that watching a film on institutionalization will change students' attitudes about chronically mentally ill patients.
The mean amount of time a (unnamed) computer server is down is 18.3 minutes with a standard deviation of 5.7 minutes.
Suppose that a study based on a sample from a targeted population shows that people at a pizza restaurant are hungrier than people at a coffee shop. make an interference based on the results of the study.
To find the 95 percent confidence interval for the true population mean. From the results below, is it true that 95% of the sample means will fall
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