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In the following exercises we consider using a random sample of 100 measurements to test null hypothesis: u=80 versus alternative hypothesis: u>80
Is there a statistically significant difference between standard deviations of blood polyphenol level change in the red and white wine groups?
The table below lists deaths in Georgia in 2004, the estimated population of Georgia in 1994 and the U.S. population according to the 2000 census
Let's say you want to know if the amount of candy adults eat influences the number of times they brush their teeth in a day.
The following results are for two independent samples taken from the two populations.
Identify a research issue, problem, or opportunity that uses data that has absolute zero measurements, such as interval and ratio level data
The Holland wood company manufacturers and assembles desks and other office equipment at several plants in Michigan
I have 2 samples that I must compare using the 5% level of risk.
Identify a research issue, problem, or opportunity that uses data that has absolute zero measurements, such as interval and ratio level data.
A computer manufacturer offers a help line that purchasers can call for help 24 hours a day, 7 days a week
Taking a trip to Sweden again. Last years statistics report showed that 65% of the entire adult population are women.
A recent article in the Wall Street Journal reported that the 30-year mortgage rate is now less than 6 percent.
Review an article Female income and the divorce decision: evidence from micro data by Randall G. Kesselringa, and Dale Bremmerb
The lives of many people are affected by fear that prevents them from flying. The Marist Institute of Public Opinion conducted a poll of 1014 adults
A pesticide control company wants to compare the effectiveness of two pest control chemicals (call then A and B) with respect to their ability to kill ants.
The quality control manager for ENTA Inc. must decide whether to accept (a1), further analyze (a2), or reject (a3) a lot of incoming material
When we say we have a confidence level of 95%, what do you think our "margin of error" is?
Using the internet (or other outside source), research a health related variable such as newborn weight or heart rate
There used to be an ad on TV that claimed one toothpaste was proven to be more effective in fighting tooth decay than another.
For the attached hypotheses test, please assume and complete all of the missing information for the data set and do the 5-step hypothesis test:
What are the theoretical considerations of hypothesis testing and why are these considerations important when conducting research studies?
The following data resulted from a taste test of two different chocolate bars. The first number is a rating of the taste, which could range from 0 to 5
Do passengers think cell phones, etc. are a serious threat to aviation safety?
A toy manufacturer claims that the mean time that its top-selling toy captures children's attention is at least 35 minutes.
Ophelia O'Brien, VP of Consumer Credit of American First Banks (AFB), monitors the default rate on personal loans at the AFB member banks.