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CRA CDs Inc. wants the mean lengths of the "cuts" on a CD to be 160 seconds (2 minutes and 40 seconds). This will allow the disk jockeys to have plenty of time for commercials within each 10-minute segment. Assume the distribution of the length of the cuts follows the normal distribution with a population standard deviation of 8 seconds. Suppose we select a sample of 15 cuts from various CDs sold by CRA CDs Inc. What percent of the sample means will be greater than 162 seconds? What percent of the sample means will be greater than 153 but less than 162 seconds?
Using an appropriate statistical test determine if there is a significant association between gender and satisfaction with the new initiative.
Victor Anderson, the owner of Anderson Belts, Inc., is studying absenteeism among his employees. His workforce is small, consisting of only five employees.
What does standard deviation measure? In looking at the standard deviations of the "with fireplace" and "without fireplace" selling prices, one is much larger than the other.
Simulate the arrival of cars at the service station for 20 arrivals and compute the average time between stations and Simulate the arrival of the cars at the service station for 1 hour
Based on data from Neilsen Media Research survey 44% of 5108 randomly selected households had their televisions sets tuned to the Superbowl on game day. Identify the sample, the population, and explain if the sample is likely to be representative ..
The dean of students believes that teh costs are greater this semester. What is the test value for this hypothesis?
Use the normal distribution to approximate the following probability: According to the most recent Davenport student profile, 47% of students have children under 17 living at home with them.
A startup company began manufacturing toy dolls tailored to environmental-oriented customers. Using linear regression, find a linear model for the Cost Function if the company's yearly costs for the next five years were (2005,$8,000,000),(2006,$1..
Using standard normal table, show critical value for left-tailed test with α = 0.02.
A computer is used and it is found that the P-value = 0.0016. What can you state about the sample (independent or dependent) and what can you conclude about the evidence?
By using the age midpoints x and the percentages of nurses, do we have a valid probability distribution? Describe.
In a recent study of 86 working adults, the mean number of hours per week spent talking on the phone was 21.6. The sd= 5.7 hours.
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