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Given the linear correlation coefficient r and the sample size n, determine the critical values of r and use your findings to state whether or not the given r represents a significant linear correlation. use a significance level of 0.05. r = 0.434 n= 15
"Factorial" means that the treatments are formed from more than one factor. What are the factors? What do "double-blind" and "placebo-controlled" mean?
A random sample of 72 statistics students was taken to estimate the proportion of students who are also in the Math Club. The 90% confidence interval was 0.438 to 0.642. Using this information, what sample size would be necessary to estimate the t..
From this data set, compute the sample mean, median, mode and midrange. Compute the 1st quartile and 3rd and interpret their meanings.
If you were to draw a scatter plot of the number of women in the workforce versus the number of Christmas trees sold in the United States for each year between 1930 and the present
Approximately normally distributed with a mean of 32 hours and a standard deviation of 2 hours. What percent of the garages take between 30 and 34 hours to erect?
an experiment consists of picking one card from a standard deck of cards. are the events picking a red car and
Provide one example of how a confidence interval could be used in a business, sports, health care, political, etc. environment. Please identify a level of confidence in your example (.90, .95, .99).
Now create a Multiple linear regression using numerical predictors only. Summaries your results and check the assumptions. Show how you can get all elements of the anova table for your multiple linear regression. . Find an estimate for σ2
A local college requires an English composition course for all freshman. This year they are evaluating a new online version of the course. A random sample of n=16 freshman is selected and the students are placed in the online course.
State the null and alternative hypotheses, in words and in symbols., The five stocks that Sara recommended to Daniela had returns of +10%, -15%, +5%, +30%, and -5% over the one-year trial period. (The overall stock market, as measured by the S&P 500..
A medical supplies company buys its supplies in bulk and redistributes them to doctor's offices and clinics. The receive thermometers in lots of 500 from the vendor. They are considering a sampling plan of n=50 and c=1.
The production of a chemical compound requires a curation period of 5.5 hours +/-.5 hours, a speed of 130 rpm +/- 20 rpm to obtain an acceptable product. If we want to know with a 95% confidence level, if these variables affect the production yiel..
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