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RA,CD's, Inc., wants the mean lenghts of the "cuts" on a CD to be 135 seconds (e minutes and 15 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 witha population standard deviation of 8 seconds. Suppose we select a sample of 16 cuts from various CD's sold by CRA CD's Inc.?
a) what can we say about the shape of the distribution of the sample mean?b) what is the standard error of the mean?c) what percent of the sample means will be greater thatn 140 seconds?d) what percent of the sample means will be greater than 128 seconds?e) what percent of the sample means will be greater than 128 but less than 140 seconds?
Would it be reasonable to conclude that the 5 percent of the employees are not able to pass the random drug test?
A research firm wants to compare the miles per gallon of unleaded regular, mid-grade, and super grades of gasoline. They drive the same car under approximately similar driving conditions and changing out the type of gasoline used.
The correlation between IQ and the verbal SAT score among the seniors at GWB High School is .90; it is significant. The mean IQ is 100 with a standard deviation of 10.
When studying the simultaneous responses to two categorical questions, we should set up a:
Assuming that the process is operating correctly according to specifications, what is the probability that a sample will indicate that an adjustment is needed?
An insurance company has gathered the following information regarding the number of accidents reported per day over a period of 100 days.
Prepare a 95% confidence interval for the average grocery bill. Would a 99% confidence interval be narrower or wider than the 95% confidence interval?
Compute the variance and standard deviation of the number that will arrive within two days.
Determine the expected frequencies for each of the cells in the following contingency tables. For each problem, state how many of the expected values actually had to be computed and how many could be found by subtraction.
Developing the histogram and pie chart for the sample data.
A random sample of 10 miniature Tootsie Rolls was taken from a bag. Each piece was weighted on a very accurate scale. The results in grams were:
What is the possibility that for a arbitrarily selected customer the service time could exceed 3 minutes?
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