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Given the linear correlation coefficient r and the sample size n, determine the critical values of r and use your finding to state whether or not the given r represents a significant linear correlation. Use a significance level of 0.05.
Cables is selected and tested find the sample mean that will cut off the upper 95% of all the sample of 20 taken from the population. Assume the variable is normally distributed.
What sample size and acceptable level would result in a probability of .05 that a good batch will be rejected and a probability of .10 that a bad batch will be accepted?
An experimental study is designed to test the potency of a drug on 16 calves. Previous studies have shown that a 10-mg dose of the drug is lethal 7% of the time within the first 7 hours.
Using a .05 level of significance, test whether the sample results indicate that the manufacturing process is functioning properly.
You're not sure if you should buy a stock and need to discover the probability of the stock having a positive return (based on one year).
Suppose the annual return on XYZ stock follows a normal distribution with mean 0.12 and standard deviation 0.30.
Also, 72 percent of the managers have MBA degrees. Using the probability formulas, find the proportion of employees who either have MBAs or are managers.
During the gestation period of 28 weeks, what percent of the babies born within each gestation period have a low birth weight (under 5.5 lbs)?
A pie chart shows the market shares of cola products. The "slice" for Pepsi-Cola has a central angle of 90 degrees. What is its market share?
Suppose that the cars have been categorized according to whether the car needs warranty-related repair (yes or no) and the country in which the company manufacturing the car is based
Develop a probability distribution for the number of travelers who plan their trips within two weeks of departure.
He estimates that he/she has a 45% chance of success with each customer. What is the probability that he/she will earn his/her bonus today?
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