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A survey found that people who took coldeeze at the onset of a cold suffered on average 42 hours. What proportion of the reprsentative sample (with a mean of 63 hours and standard deviation of 20 suffered for longer and 48 hours?
The sample mean of the sampling distribution of a statistic is 6 and the standard error of the statistic is 1.03. What is the probability that xbar > 7.52?
What is the difference between statistical significance and practical significance? Why is statistical significance not necessarily of practical important difference to a business decision?
Based on our sample, how do you interpret the results and what do these results suggest about the population means for male and female average salaries?
At a factory that produces pistons for cars, Machine 1 produced satisfactory pistons and unsatisfactory pistons today
The Weschsler IQ test has a μ =100 and a σ = 15. A vitamin company said if people took vitamin X for 30 days their IQ would improve. A simple random sample of 49 people took the vitamins for 30 days. They then took the IQ test. The mean IQ of the ..
three people who do not know each other are standing in line at a movie theatre waiting for the box office to open.
In a survey of women in a certain country (ages 20-29), the mean height was 62.9 inches with a standard deviation of 2.81 inches.
x1 = 100 and x2 = 127 successes were observed. What is the best point estimator for the difference ( p1-p2) in the two binomial proportions?
Suppose you just received a shipment of eight televisions. Two of the televisions are defective. If two televisions are randomly selected, compute the probability that both televisions work. What is the probability at least one does not work?
A stock price is currently $100. Over each of the next two three-month periods, it is expected to increase by 10% or fall by 10%. Consider a six-month European call option with a strike price of $105.
use this information about the overhead reach distances of adult females mean 205.5 cm sd 8.6 cm and over head reach
Clearly identify the independent and dependent variables you would study, including the number of levels of the independent variable.
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