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The shape of the distribution of the time required to get an oil change at a 10?-minute ?oil-change facility is unknown.? However, records indicate that the mean time is 11.7 minutes?, and the standard deviation is 4.4 minutes.
What is the probability that a random sample of n = 35 oil changes results in a sample mean time less than 10 ?minutes?
identify the types of samples- systematic cluster convenience random stratified1. a sample was taken of every 49th
Which trend model is best, and why? If none is satisfactory, explain. (e) Make a forecast for 2004 by using a trend model of your choice or a judgment forecast.
Gallup World. At its Web site (www.gallupworldpoll .com) the Gallup World Poll describes their methods.
A medical social researcher wishes to investigate the proportion of Type II diabetic patients in a given country town who take insulin to manage their diabetes. A random sample of 120 Type II diabetes patients across the medical practices in the t..
Make a scatterplot of the data. Find the equation of the least-squares regression line for predicting BAC from number of beers and add this line to your plot
Construct a 90 percent confidence interval for the proportion of all kernels that would not pop. (b) Check the normality assumption. (c) Try the Very Quick Rule.
Identify hypotheses, test statistic, P-value or critical value, conclusion about the null, and final conclusion that addresses the original claim.
Use the 68-95-99.7 Rule to sketch a curve for this distribution, marking off the weights that are within 1, 2, and 3 standard deviations of the mean.
Explain and show exactly how you are getting the correct information from your data set and how you are computing the probabilty.
Assuming data come from a random sample, under which of the following conditions should we notcalculate a confidence interval for a population mean?
let x denote the weight gain in pounds per month for a calf. the probability distribution of x is shown below.xnbsp
Public Health and Nutrition High levels of the chemical dioxin, ingested through food and air, can cause diabetes, immune disorders, and cancer.
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