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Last year, your company's service technicians took an average of 2.6 hours to respond to trouble calls from business customers who had purchased service contracts. Your company wants to find out if this year's data show a different average response time. In order to do so, they review 42 service calls and construct a 95% confidence interval for population mean: (2.468, 2.743).
What can we conclude about the significance test of Ho: mu = 2.6 vs Ha: mu does not equal 2.6?
In fitting a least squares line to n=15 data points, the following quantities were computed: SSxx=55, SSyy=198, SSxy=-88, x-bar=1.3, and y-bar=35.
Find a 95% confidence interval for the proportion p of the inner-city, working-class group who eventually became alcoholics.
The starting salaries of individuals with an MBA degree are normally distributed with mean of $40,000 and standard deviation of $5,000. What percentage of MBA's will have starting salaries of $34,000 to $46,000?
Five horses are running in a race. I bet that Hot Shot will win first place, and Urawinner will win second. What is the probability that I will win?
Explain the notion of hypothesis testing. What is the general process that one should follow in conducting a hypothesis test?
Utilizing your charts stated whether the filling operation has been in control for every of the 18 operating hours this day.
When using dummy variables in a regression equation to model a qualitative or categorical variable, the number of dummy variables should equal to
Here is a two-way table showing enrollment data for full-time undergraduate students in U.S. colleges and universities. The entries are thousands of students:
There is 0.75 probability that you will get promotion or raise. Probability of getting promotion and raise is 0.50. Determine the probability to receive a raise.
It has been evaluated that 30% of all farms are family-owned. In sample of 12 farms, determine the probability that exactly 3 farms are family owned?
If a constant release of a gaseous low-level radioactive isotope from a medical facility is allowed, what would be the acceptable release rate in a year's period (in rems per hour).
When should researchers use different hypothesis tests for independent and related samples? Is one type of sample preferable over the other?
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