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A survey of 68 courses delivered fully online found a mean of 13.5 videos with a standard deviation of 2.81. You can assume that the number of videos in an online course is normally distributed. Find the 89% confidence interval for the mean number of videos in a fully online course.
Examine the two standard deviations. What do these indicate about the range of benefits enjoyed by the two groups?
Last year, there were 30,000 students at a university; their GPA had a mean of 2.9 and an SD of 0.6. This year, in a simple random sample of 100 students taken from this university, the GPAs have a mean of 2.95 and an SD of 0.55. Has the mean GPA ..
a manufacturer claims that the batteries it makes will last 18 hours with a standard deviation of 1.5 hours. if the
insurance companies track life expectancy information to assist in determining the cost of life insurance policies.
As a part of their testing program Sony tests samples of 25 batteries. What can you say about the shape of the distribution of sample mean?
the relationship assumed linear between yield of bourbon y and aging time x was studied by observing yields yi from
The time between arrivals of customers at the drive-up window of a bank follows an exponential probability distribution with a mean of 10 minutes. What is the probability that the arrival time between customers will more than 20 minutes?
julie is shopping for an car insurance policy. during the following year there is a .01 probability that her car will
Compute the mean of the distribution of the sample means and the population mean. What is true about the two values?
a. Find the probability distribution of d1 and display it in a table. b. What is the expected value of d1? c. What is the value of the standard deviation of d1?
a die is continuously rolled until the total sum of all rolls exceeds 250. what is the probability that at least 70
Consider the k-out-of-n system (info on the system: A system consists of n independent components. Each component functions with probability p. The system as a whole functions if at least k components are functioning (1
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