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A simple random sample of 49 8th graders at a large suburban middle school indicated that 82% of them are involved with some type of after school activity. Find the 99% confidence interval that estimates the proportion of them that are involved in an after school activity
The manufacturer of a coffee dispensing machine claims the ounces per cup is normally distributed with population mean equal to 8 ounces and standard deviation equal to 0.9 ounces. If 50 cups of coffee were measured, what is the possibility that- ..
What is the point estimate of the mean planned expenditure by all Americans taking long summer vacations in 2002?
the following sales data are available for 2003-2008.year demand2003 72004 122005 142006 202007 162008 25determine a
Use the binomial distribution in the Data Analysis add - in to simulate the distribution of men and women among the next ten arrivals at an emergency room, assuming that, on average, six people out of ten who arrive are men.
Suppose that data is recorded for equal period of "before"-"after" time. Use 1% level for risk. Given processed data, explain what John must do.
A manufacturer claims that the mean lifetime, , of its light bulbs is 49 months. The standard deviation of these lifetimes is 9 months. Seventy bulbs are selected at random, and their mean lifetime is found to be 46 months.
Find out the least-squares regression line and interpret its slope.
suppose instead the data from problem 1 and 4 were taken on the same process thus the data are no longer independent.
A random sample of 121 checking accounts at bank showed an average daily balance of $280 the standard deviation of the population is known to be $6. Find the standard error of the mean.
To develop 3-month and 2-month moving average for the time series.The following data represents demand for company ABC's products for the last 10 months.
Enter variables using the stepwise procedure.
Standard deviation of 8.3 minutes. Assuming normality, at the a = .05 level, is there enough evidence to show the mean oil change time is different?
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