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Mean output of solar cells of three types are measured six times under random light intensity over a period of 5 minutes, yielding the results shown. Research question: Is the mean solar cell output the same for all cell types?
SolarWatts
Solar Cell Output (watts)
Cell Type Output (watts)
A 123 121 123 124 125 127
B 125 122 122 121 122 126
C 126 128 125 129 131 128
Estimate the relative risk of neurological impairment for children exposed to secondary smoking, and calculate a 95% con?dence interval for this risk.
Medical researchers interested in determining the relative effectiveness of two different drug treatments on people with a chronic mental illness established two independent test groups.
According to accountemps inc. 48% of all executives believe that employees are most productive on Tuesdays. a random sample of 200 executives is taken for a study.
Briefly explain how sample size affect outcome of hypothesis test. How does sample size affect measures of effect size?
To test the hypothesis that students who finish an exam first get better grades, Professor Barker kept track of the order in which papers were handed in.
Kansas City prefer the new package, the probability that Catherine's random sample of 300 households will have a sample proportion greater than 0.45 is?
The mean of a normal distribution probability is 400 pounds. The standard deviation is 10. What is the area between 415 pounds and the mean of 400 pounds? (Round to 4 decimals)
The pooled variance of two samples is:
The average buglary rate for a juisdiction has been 311 per year with a standard deviation of 50 what is the probability that next year the number of burglaries will be more than 350.
Recent medical research demonstrated there is a strong (r=.60) correlation between the excessive weight and incidences of breast cancer. How can we interpret this statement?
She wants to be 95% confident that her estimate is correct. If the standard deviation is $1050, how large a sample is needed to be accurate within $200?
Two teams of workers assemble automobile engines at a manufacturing plant in Michigan. Quality control personnel inspect a random sample of the teams assemblies and judge
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