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The lifetime of a 2-volt non-rechargeable battery in constant use has a normal distribution with a mean of 516 hours and a standard deviation of 20 hours.
You take a random sample of four 2-volt non-rechargeable batteries. What is the probability that their average lifetime would be less than 510 hours? Use your calculator to solve this problem and give your answer as a number between 0 and 1, rounded to 3 decimal places.
What does it mean for two random variables to be uncorrelated?
Write a hypothesis that you might test to compare two or more samples in your example. Indicate which hypothesis test you would use and the samples you would select.
The director of a radio broadcasting company wants to determine whether the mean length of commercials on his station is equal to 24 seconds.
What nonparameiric test can be used to distinguish total heart weight of males with left-heart disease with that of normal males? Write and Implement test and report a p-value.
The average height of a particular plant is known to be 78 cms. The average height of 20 plants to which a particular manure was applied was found to be 85 cms.
Assume that in a hypothesis test with null hypothesis H 0 : μ = 14.0 at a = 0.05, that a value of 13.0 for the sample mean results in the null hypothesis not being rejected. That corresponds to a confidence interval result of:
Suppose that 1% of all people have a particular disease. A test for the disease is 99% accurate. This means that a person who test positive for the disease has a 99% chance of actually having the disease
A gambler has developed two strategies for betting in the game of blackjack. To test these strategies, he decides to go gambling on a casino boat.
Bob Nale is the owner of Nale's Quick Fill. Bob would like to estimate the mean number of gallons of gasoline sold to his customers.
Compute β-error of test in part (a) if true difference in mean burning rate is 2.5 centimeters per second.
An American Society of Investors Survey found that 30% of individuals have used a discount broker. In a random sample of 9 individuals, what is the probability That:
At the .025 significance level, can we conclude that less than 88 percent of the orders are delivered in less than 10 minutes?
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