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In a factory, only two machines, A and B, manufacture washers. Neither machine is perfect: machine A produces defective washers 16 % of the time, while machine B produces defectives 15% of the time. Machine B is more efficient than machine A and accounts for 60% of the total output of washers. For purposes of quality control, a sample of washers is taken and examined for defectives. Compute the probability that a randomly chosen washer found to be defective was manufactured by machine B. Round your answer to two decimal places.
A mean given by mu=143 lb and a standard deviation given by sigma=29 lb. If 1 woman is randomly selected, find the probability that her weight is below 113
The following data set shows the ages of the first 7 presidents and the 7 most recent presidents including President Obama. Find the mean, median, and range for each of the two data sets.
Need to come up with a regression model to forecast monthly sales of cold beverages for the next year. What variables might be included in the model?
If the measurements are assumed to come from normally distributed populations with equal variances, estimate the difference between the population means, with con?dence coef?cient 0.95, and interpret.
The data set below, S10 , from Holmes and Mergen (1992)6 , is a sample of viscosity measurements taken from ten consecutive, but independent, batches of a product made in a batch chemical process.
q. which of the following is not an assumption that must be met for the least squares estimations to be valid? why?a
After entitlement was entered in Step 1 of the regression equation, entitlement accounted for 3% of the variance in rage when it was entered in Step 2. Does entitlement appear to mediate the effects of narcissism on rage?
With a population standard deviation of 15. Use the 95% confidence interval. Approximately how many Kleenexes should go in the automobile glove compartment boxes?
The sample mean life is 5.5 years with a standard deviation of 0.6 years. If you were constructing a 99% two-sided confidence interval estimate, the lower limit would be?
a study of various news home pages reports that the mean number of bad links per home page is 0.4. if the errors occur
Would the null hypothesis that the 2007 median household income was $50,000 be rejected at the 10% significance level in favor of the two-sided alternative? (Choose the correct answer)
In the study, 246 of the 768 male firefighters correctly identified their weight as either normal, overweight or obese. The 95% confidence interval for the proportion of all male firefighters that correctly identify their weight is 28.7% to 35.3%
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