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Assume that a study is performed and in this study, subjects are asked to maintain eye contact with another individual for as long as possible. The length of time recorded is normally distributed with a mean of 184 seconds and a standard deviation of 55 seconds.
What is the probability that and individual will be able to keep eye contact longer than 239 seconds?
An analysis of variance was used to evaluate the mean differences from a repeated-measures research study. The results were reported as F(3,24)=6.40.
At the .05 significance level can we conclude that there is more variation in the processing time of the new machine?
What are the assumptions that must be met for non-parametric statistics? What are the positives and the negatives of the chi-square test?
A random sample of 8 petrol stations in each of three European countries A, B and C was taken. The price per litre at each station was recorded in Euros. The prices are given below.
Determine the margin of error that corresponds to the given values of n (times) and x (successes) and the degree of confidence: n=1400, x=420, 95%. Go 3 decimal places of precision.
She asked her assistant for a 95% confidence interval, approximately how large a sample did her assistant use to determine the interval estimate?
Company are interested in how a new spaghetti sauce made from green tomatoes (and green in color) will compare to their traditional red spaghetti sauce. They are worried that the green color will adversely affect the tastiness scores.
Normal distribution with mean 32.6 ounces and standard deviation 0.4 ounce. If two packages are randomly selected, what is the probability that the average weight is less than 32 ounces?
The probability that house sales will increase in the next 6 months is estimated to be 0.25. The probability that the interest rates on housing loans will go up in the same period is estimated to be 0.74. The probability that house sales or intere..
A nursing school wants to estimate the true mean annual income of its alumni. It randomly samples 120 of its alumni. The mean annual income was $58,700 with a standard deviation of $1,500.
The researcher will then compare the scores for the 2 treatments. If there is a difference between the 2 groups of scores, briefly explain how the difference may have been caused by the treatment.
Assume the population is normally distributed, the confidence level is 95%, n = 12, and σ is unknown.
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