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A radio station sells advertising spots on the basis that the mean age of its listeners is 25 years. Assume that a random sample of 64 listeners shows a mean age of 26 yrs and a standard deviation of 5 yrs.
At the 5% significance level, can the station conclude that the mean age of its listeners is not 25 yrs. Formulate and test the appropriate hypotheses. Use the critical value approach.
Armstrong Faber produces a standard number-two pencil called Ultra-Lite. Since Chuck Armstong started Armstrong Faber, sales have grown steadily. With the increase in the price of wood products.
Consumer Review posts reviews and ratings of a variety of products on internet. The following is a sample of 20 speaker systems and their ratings (www.audioreviews.com).
If hypothesis test for single population variance is to be conducted by using significance level of to 0.10, a sample size of n = 16, and test is a one-tailed upper-tail test, the critical value is?
Find out the probability that temperature of oven will range from 460 to 470 F?
Determine the probability that tire wears out before 70,000 miles?
Find the probability that a women develops breast cancer given that she has a family history of breast cancer._____________
Finding the probability of each event in a group of events of different possibility
Would Kruskal-Wallis be the suitable statistical procedure to test this Research Question (RQ)? Describe your answer. When would you use Chi-Square test rather than One-Way Anova?
A producer of pleasure boats wants to maximize revenue during the next month. Two types of boats are sold, x1 and x2. Type x1 sells for $40,000 and type x2 sells for $30,000.
Use the permutations rule to determine the total number of different ways the winners can be drawn.
Explain these results to a person who understands the t test for a single sample but knows nothing about the t test for independent means.
Find the probability of failure of system for any 4 hours of operation?
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