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A coin-operated drink machine was designed to discharge a mean of ounces of coffee per cup. In a test of the machine, the discharge amounts in randomly chosen cups of coffee from the machine were recorded. The sample mean and sample standard deviation were ounces and ounces, respectively. If we assume that the discharge amounts are normally distributed, is there enough evidence, at the level of significance, to conclude that the true mean discharge, , differs from ounces?Perform a two-tailed test.
Find the null hypothesis, the alternative hypothesis, the type of test statistic, the value of the test statistic, and the p-value
a manufacturer of widget will accept a box of widgets is 10 of the widget are randomly selected without replacement
Suppose you are to analyze the ages of 377 randomly selected employees, ranging from 26 to 58. Using Sturge's formula, find the appropriate number of classes from the sample.
Suppose we are interested in mean decay rate of a compound in the Mill River. Determine the mean decay rate is greater than 3.0 per day. When you test a random sample of size 15, the sample mean decay rate is 3.15. If an assumed known standard dev..
1) Ace Car Rental has three main models that are used in it midsize range of cars. The cars are very similar and perform at about the same level. Since the customer has to pay for the gas use during the rental period, the manager is often asked about..
A straight rod is formed by connecting three sections A, B and C, each of which is manufactured on a different machine. The length of section A, in inches has a normal distribution with mean 20 and variance 0.04.
A computer analysis of 30 pairs of observations results in the least-squares regression equation yˆ 5 14.0 1 5.0x, and the standard deviation of the slope used in testing whether the population coefficient of correlation could be zero?
Explain the effect outliers can have on the analysis of the center of this data set. Based on the box-plot and histogram you created for problem 1, do there appear to be any outliers?
Let A, B, C be three events such that P(A) = 0:5, P(B) = 0:6, P(C) = 0:8(a) Can any two of these events be mutually exclusive? Explain your conclusion
Thompson Machine Works purchased several new, highly sophisticated machines. The production department needed some guidance with respect to qualifications needed by an operator. Four variables were listed.
What is the standard deviation of the sampling distribution of the proportion of sixes?
For the following stock price one-year percentage changes, plot the data and identify any outliers. Find the mean and median.
Could this information be viewed as representing the ratio scale of measurement? If so , explain why. If not, why not.
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