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As part of a safety check, the Keystone Cops randomly stopped 65 ambulances and checked their tire pressure. The sample mean was 32 lbs/sq. in. with a sample standard deviation of 2 lbs/sq. in. Find the 98% confidence interval for the population mean.
Computing the Z scores for the given data and evaluate µ and σ for the population.
One characteristic of billiard balls is their elasticity - the bounce they get when striking one another. A manufacturer of billiard balls is testing three additives to the basic plastic.
Using this information, calculate Beta risk (probability of Type II error) if the true population mean really is 77.
illustrate briefly how an experimental study is conducted. What is the difference between the two types of variables used.
What percentage of population scored between the mean and Jorge?
Find the probability that 665 or fewer college students in the sample send and receive text messages with their phones? Is this result unusual?
Carry out the test for the variance of girls score is not significantly less than the given data.
Given that P (A) = 0.7, P (B) = 0.5, and P (A B) = 0.8. Find the following probabilities:
State the null and the alternative hypotheses. Using the p-value approach, test to determine whether or not the mean age of all employees is significantly more than 40 years.
You read that statistical test at α=0.01 level has probability 0.14 of making a Type II error when specific alternative is true. Calculate the power of test against this alternative?
At the 5% significance level, if the sample proportion is .45, and the standard error of the sample proportion is .035, the appropriate conclusion would be:
Set up hypotheses and test to find out whether or not population variance is larger than $100.
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