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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.
Suppose there are two samples of size 6 and 7, with a rank sum of 58 in the sample of size 6. Using the Wilcoxon rank sum test, evaluate the significance of the results, assuming there are no ties.
Which of the following models satisfies the rules of probability and The event corresponding to the above system functioning properly during one period of operation is
Employ a four period moving average and determine the forecasted demand for August. Put your answer in the form xx.x with no additional numbers or symbols.
Let 3 trails (they may not be independent), each of which is either success or not. Let X denotes number of successes. Assume E[X] = 1.8. Determine the largest possible value of P(X=3)?
When trucks arrive at the Ambassador Bridge, each truck must be checked by customs agents. The times are exponentially distributed with a service rate of 10 per hour. What is the probability that a truck requires more than 15 minutes to be checked..
At the 5% level of significance, can we infer that the population mean weight of athletic men is lower than the population mean weight of non-athletic men by more than 2 pounds?
A school administrator randomly selects 12 classes from your school and then selects all of the students of those classes to study a school library issue. Which type of sampling design is being used.
For which of the following situations is it appropriate to use a scatter diagram or scatter plot?
Find a 90% confidence interval for the population mean weight of all such turtles.
Describe the circumstances under which you should use ANOVA instead of t tests, and explain why t tests are inappropriate in these circumstances. Find a peer-reviewed article that reflects these circumstances, describe the research conducted (i.e...
Administrators at a university are planning to offer a summer seminar. It costs $3000 to reserve a room, hire an instructor, and bring in the equipment. Assume it costs $25 per student for the administrators to provide the course materials.
We would like to test if the proportion of respondents that support the health care bill is less than 50% (a) what kind of hypothesis test is appropriate?
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