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Assume the data have bell shaped distribution with a mean of 30 and a standard deviation of 5. Employ the empirical rule to determine the percentage of data within each of the following ranges: 20 to 40, 15 to 45, and 25 to 35.
Determine the sample size needed in order to be 99% confident that the sample proportion of the current customer accounts is within .03 of the true proportion of all current accounts for this company.
Which distribution should be used to create 80% confidence interval?
Assume that each shipment contains a random sample of bearings. a. What is the probability that a given shipment is acceptable?
Computing a linear regression equation to predict the future values of the dependent variable Y - Linear relationships into a single multiple regression.
State the null and alternative hypotheses you would use to test whether the year-end bonuses paid by Jones & Ryan were different from the population mean.
Consider the following stemplot. The mean of the data represented in this stemplot ?
Given are the numbers of times the machine was used over each of the last 30 days. Find out the mean number of times the machine was used per day.
Determine regression line for predicting January temperature from latitude.
Report the t-value, whether you accept or reject Ho, and whether the difference was significant in a brief sentence.
Evaluate the value of population proportion. Develop a 99% confidence interval for population proportion.
The number of girls who attend a summer basketball camp has been recorded for the seven years the camp has been offered.
If many samples of size 1000 persons are chosen, determine the expected value (mean X-bar) or average of average IQ's for these samples?
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