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A computer help desk is provided by Gregory. Some of the callers need assistance with hardware and other with software. A sample of 30 software calls showed an average of 13 minutes with a standard deviation of 1.1 minutes for handling a call. For 40 hardware callers, the average was 16.8 minutes with a standard deviation of 2.1 minutes. The manager decided to assume that the population standard deviations were unequal. At alpha =0.5 can we conclude that it takes less time to resolve software issues? Estimate the P value
for women age 25-34 with full-time jobs the average income in 2004 was 32000 and the sd for income was 26000. assuming
a sample of 15 graduates from eastern university showed that the mean time until they received their first job
emily is interested in understanding if there is a relationship between whether or not people think the diversity
let x denote the number of heads obtained when a fair coin is tossed 4 times.a what is ex and varx?b repeat 10 times
a bureau of national affairs survey found that 79 of employers provide their workers a two-day paid thanksgiving
Average of this group is 229. Population standard deviation for both groups is 6. At α = 0.01, is there difference in cholesterol levels between two groups?
The remaining 5 were not given the overview. Here are the scores for students in each group:
service calls come to a maintenance center according to a poisson process and on the average 2.7 calls come per minute.
Which of the following would produce a new confidence interval with smaller width based on these same data and produce a new confidence interval
Assume that for population of students at school, distribution of x is well approximated by normal curve with mean 48 min and standard deviation 4 min.
the correlation between the number of police on the street and the number of crimes committed for a sample of 15
To demonstrate the effectiveness of the drug, a researcher selects a sample of n = 25 children diagnosed with the disorder and measure each child's attention span before and after taking the drug.
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