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The playing time X of classical CDs has the normal distribution with a mean of 54 and a standard deviation of 5; the N(54, 5) distribution. What is the relative frequency of classical CDs with a playing time X between 49 and 69 minutes?
How would you use the binomial distribution in making a business decision during a normal day of work in the career of your choice?
The population of lengths of aluminium coated steel sheets is normally distributed with a mean of 30.05 inches and a standard deviation of 0.20 inches. A sample of four metal sheets is randomly selected from a batch. What is the possibility that t..
How many subsets of S contain either the number 6 or the number 15?
Assume that a random variable, x, is distributed according to a normal distribution with mean 12 and standard deviation 2. Find the z-value if:
What happens to the confidence interval when we go from a 95% confidence level to a 99% confidence level? Is this desirable? When would we want to use a 99% confidence interval?
The firm examined 35 randomly chosen fax transmissions during the next year, yielding a sample mean of 14.44 with a standard deviation of 4.45 pages.
A random sample of 32 bottles is selected, and the mean amount of water per 1 gallon can is found to be 0.995 gallon. Calculate the test statistic.
Complete the ANOVA table. Carry out a test of hypothesis on each of regression coefficients. Could you delete any of the variables?
Determine change in average number of weekly viewers from to?
If the population is normally distributed then the sample mean is also normally distributed even for small sample size.
Using the 0.10 level of significance, is there evidence that the mean shopping time at the local supermarket is greater than the claimed value of 22 minutes?
At the .05 significance level can we conclude that there is more variation in the processing time of the new machine?
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