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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.
These individuals are then examined and categorized as to whether they have a heart disorder. The observed frequencies are as follows:
In the North American court system, a defendant is assumed innocent until proven guilty. In an ideal world, we would expect that the truly innocent will always go free, whereas the truly guilty ones will always be convicted.
Standard deviation of $1.2 million in 2009. Suppose a sample of 100 major league players was taken. What was the standard error for the sample mean salary?
Use x for the number of bats and y for the number of balls made per week. The number of work-hours avaiable for construction and finishing is fixed.
According to the U.S. Bureau of the Census, 75% of adults regularly drank alcohol in 1985. An investigator predicts that fewer adults drink now than drank then.
Find out the probability that disc doesn't touch line between two planks. Find out also expected distance from center of the disc to closest line between two planks.
Data from the Motor Vehicle Department indicate that 80% of all licensed drivers are older than age 25. In a sample of n=60 people who recently received speeding tickets, 38 were older than 25 years and the other 22 were age 25 or younger.
What is the p value? Describe the steps in formal hypothesis testing. Make at least one comment for each step.
At 0.01 significance level can we conclude that mean fare has increased? Determine the p-value?
A candy confectioner measures the weight of 30 pieces of candy and obtains a mean and standard deviation of 32.5 gms and 2.6 gms, respectively. Construct the 98% confidence interval for the population mean.
What the information do z-scores give that actual heights do no?
Within distribution of scores, measures of dispersion give an indication of?
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