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Your distributor is to deliver a large quantity of sweaters. You have ordered
Talk about the effect of no smoking laws on the tobacco industry. Will the trend in no smoking laws affect cigarette sales? You can develop a null from that.
Conduct a test of hypothesis that the mean price (current) of the stocks on Sample A is the same as the mean price (current) of all stocks in sample B
A newly installed automatic gate system was being tested to see if the number of failures in 1,000 entry attempts was the same as the number of failures
You are the Vice President for Human Resources at XYZ Investment Management, Inc. Your employees have recently complained about their long working hours
The owner of Maumee Ford-Mercury wants to study the relationship between the age of a car and its selling price.
Do a complete hypothesis test on the problem, including hypothesis, decision rule, calculations of the statistic, decision, interpretation, and p- value.
A new drug is being tested to see if it reduces the number of migraine headaches. Assuming equal variances, at alpha = .025, do these samples
If s is unknown when completing a hypothesis test about the population mean, then the best estimate for the unknown standard deviation is s.
Suggests that people will follow a 24 hour cycle of sleeping and waking even if they are not exposed to the usual pattern of sunlight.
Does Lovastatin reduce the risk of heart attack? In texas study, researchers gave lovastatin to 2,325 people and an inactive substitute to 2081 people.
In testing the hypothesis, H0: u _> 28.7 and Ha: u < 28.7, using the p-value approach, a p-value of 0.0764 was obtained
The following results are for two independent samples taken from the two populations.
In a randomized, double-blind, placebo-controlled trial of children, echinacea was tested as a treatment for upper respiratory infections in children
It has been claimed that the mean age of all FHSU Virtual College statistics students is at most 30 years old. Using the age data collected from this class
Because of the expense involved, car crash tests often use small samples. When five BMW cars are crashed under standard conditions, the repair costs
The executive committee has learned that the average salary for executives in the industry is $140,000, and the committee is concerned
In a recent year, some professional baseball players complained that umpires were calling more strikes than the average rate of 61.0% called the previous year
A survey of n = 703 randomly selected workers showed that 61% of those respondents found their jobs through networking.
A medical school claims that more than 28% of its students plan to go into general practice.
66% of students at a university live on campus. A random sample found that 20 of 40 male students and 40 of 50 of female students lived on campus
A researcher wanted to determine if using an octane booster would increase gasoline mileage. A random sample of seven cars was selected
Does lovestain (a cholesterol lowering drug) reduce the risk of heart attack? In a Texas study researchers gave lovestain to 2,325 and an inactive substitute
A random sample of 5 observations from the first population resulted in a standard deviation of 12. A random sample of 7 observations from the second population