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Find the probabilities values based on normal distribution
Let z represent the standard normal variable and suppose a value is randomly selected. Find each of the following probabilities by:
i) Drawing the standard normal curve and indicating the area representing the probability and
ii) Calculating the probability using P (z < 1.41)
The ________ is the probability of observing a sample value as extreme as, or more extreme than the value observed, given that the null hypothesis is true.
At the .05 significance level, can we conclude that the mean waiting time is less than 3 minutes?
Let p represent the proportion of registered voters in the state that would vote for the Republican candidate. The standard error for the proportion of those who phoned in who answered "yes" is
An automobile insurance company estimates the following loss probabilities for the next year on a $25,000 sports car:
Test to see if the mean cell phone bill has changed since 2004. Use a .05 level of significance for the test.
What does confidence interval tell you? What does it mean? What 2 things can a researcher do to decrease width of a confidence interval? What are the effects?
Determine the mean and standard error of the x - bar distribution.
By using the fact that Martha believes the treatment will decrease the amount of time to fall asleep, describe the null and alternate hypotheses.
Compute β-error of test in part (a) if true difference in mean burning rate is 2.5 centimeters per second.
Find the expected GPA when SAT = 800. Find E (GPA|SAT = 1,400). Comment on the difference.
What is the probability that a simple random sample of 40 male graduates will provide a sample mean within $10,000 of the population mean, $168,000 (to 4 decimals)?
Determine the rejection region for the test of Ho: (mean 1 - mean 2) > 2.43 Use a = 0.04. z >
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