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The mean SAT score in mathematics is 498. The founders of a nationwide SAT preparation course claim that graduates of the course score higher, on average, than the national mean. Suppose that the founders of the course want to carry out a hypothesis test to see if their claim has merit. State the null hypothesis H0 and the alternative hypothesis H1 that they would use.
Ho =H1 =
Please see attached file.
Find a 99% confidence interval estimate of the proportion of people who say that they voted.
Computing the probability values using normal distribution - what proportion of licensed drivers are less than 30 years old?
Which is the probability that the median of the sample is between $17 and $20?
Describe 5 data collection techniques in your own words. Explain why the four demographic questions you included in your survey are important and or are of interest to the study.
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.
At the .05 significance level, is the number of units produced on the afternoon shift larger?
Need guidance on how to approach a statistics paper. Problem: utilize statistics to solve a business related problem. The synopsis should include a discussion of the specific problem, the research methodology used, the quantitative and qualitative..
A sample of 100 widgets from the Acme production line shows that the average lifespan of these parts is 900 hours. The standard deviation of production has been 200 hours historically and is known to be normally distributed.
A single test on a certain device costs more than the entire lot. It is therefore decreed that not more than three tests will be performed per lot.
Now we would like to evaluate regression equation for X using Y as independent variable.
Can you give a general rule as to what happens with confidence intervals as a function of sample sizes and confidence levels? What are the trade-offs?
Simulate both one-and two-teller systems, calculate waiting time, average queue length, and percentage utilization for each system.
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