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In experimental situations, care is taken to control for as many factors as possible which might influence the results so as to increase the confidence of the causal relationship between the independent and dependent variables. In cases where results are of marginal statistical significance, say just less than 0.05, how might this level of control affect the ability to apply the results in real world settings?
A manufacturer wants to increase the shelf life of a line of cake mixes. past records indicate that the average shelf life of the mix is 216 days. after a revised mix has been developed, a sample of nine boxes of cake mix gave these shelf lives (i..
How are prokaryotes and eukaryotes different in terms of the RNA polymerases involved in transcription?
calculate the mean and variance for each portfolio's returns
Make a worksheet in Excel for your calculations. (b) Make a histogram of the data. Would you be justified in using a parametric t test that assumes normality? Explain.
Continue your work from the previous exercise. The interquartile range IQR is the distance between the first and third quartiles of a distribution.
Use the Poisson distribution to approximate the binomial distribution o determine the probability no adults from this sample have had a total knee replacement.
the game continues until soneone gets heads. What is the probability of each of them winning?
What is the probability that a randomly selected exam will have a score of at least 71? What percentage of exams will have scores between 89 and 92? If the top 2.5% of test scores receive merit awards, what is the lowest score eligible for an award?
Fair Die Toss a fair six-sided die. The probability density function (pdf) in table form is given. Make a graph of the pdf for the die.
For what kind of data set is the chi-squared test for independence appropriate? What are the reference values for this test, if any?
the random variable x has a binomial distribution with parameters p0.20 and p0.156. use an appropraite distribution to
According to Dan Lenard, an independent insurance agent in the Buffalo, N.Y. area, the following is a breakdown of the amount of life insurance purchased.
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