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Question: The administration of a large university wants to use a random sample of students to measure student opinion of a new food service on campus. Administrators plan to use a continuous scale from 1 to 100, where 1 is complete dissatisfaction and 100 is complete satisfaction. They know from past experience with such questions that the standard deviation for the responses is going to be about 5, but they do not know what to expect for the mean. They want to be almost sure that the sample mean is within plus or minus 1 point of the true population mean value. How large will their random sample have to be?
The article "Multimodal Versus Unimodal Instruction in a Complex Learning Environment" (J. of Experimental Educ., 2002: 215-239) described an experiment carried out to compare students' mastery of certain software learned in two different ways.
A population has a mean score of 75 and a standard deviation of 13. What is the probability of choosing a random sample of 100 people from this population with a mean of 78 or higher? Show work.
surveys repeatedly show that about 40 of adults in the u.s. indicate that if they only had one child they would prefer
The management of a supermarket needs to make estimates of the average daily demand for milk.- Assuming that this is a random sample of daily demand, give a 90% confidence interval for average daily demand for milk.
Suppose the sample mean is x‾ = 4.014. Should the process be stopped?- Suppose the sample mean is x‾ = 3.979. Should the process be stopped?
an article reported the following data on oxygen consumption mlkgmin for a sample of ten firefighters performing a
Compute the mean, standard deviation and Coefficient of variation of the following data and comment on the result - Calculate the Karl Pearsons coefficient of correlation
Chips ahoy. For the computer chips described in Exercise, how many do you expect to test before finding a bad one?
The size of an atom is approximately 10-8 cm. To locate an electron within the atom, one should use electromagnetic radiation of wavelength not longer than 10-9 cm. What is the energy of the photon with such a wavelength (in cV)?
Express the statistical information in words. What changes were there in the overall shape of the distribution of this variable? In central tendency?In dispersion
Look at the dataset. What design is it? What else do you notice and obtain the (appropriate) ANOVA table to be used in the analysis.
The following four comments expand the list given in the text under factors that predict the fees generated by a client that suggest six explanatory variables that can be added to the regres- sion model. Use these to improve the fit of the model s..
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