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Suppose that the four inspectors at a film factory are supposed to stamp the expiration date on each package of film at the end of the assembly line. John, who stamps 20% of the package, fails to stamp the expiration date once in every 200 package. Tom, who stamps 60% of the packages fails to stamp the expiration date once in every 100 packages; Jeff who stamps 15% of the packages, sails to stamps the expiration date once every 90 packages; and Paul, who stamps 5% of the packages, fails to stamp the expiration date once in every 200 packages. If a customer complains that her package of film does not show the expiration date, what is the probability that John inspected it?
a. Is there evidence the mean amount is different from 1.0 gallon (alpha= 0.01)? b. Compute the p-value and interpret its meaning. c. construct a 99% confidence interval estimate of the population mean amount of paint.
Six people have declared their intentions to run for a county commission seat in the next general election. A political poll is conducted three-quarters of the way into the campaign to determine if there are any clear preferences on the part of th..
In a sample batch of 46 mechanical pencils it is assumed that 18 are defective. If 5 mechanical pencils are randomly selected, what is the probability that none of them are defective?
A group of day to day workers can work either 0 hours, eight hours or 12 hours at a pay rate of $9.75 per hour. (The 12 hour day pays regular time for the first eight hours and double time for the remaining four hours.
The number of hurricanes that are formed during each hurricane season can be modeled using the Poisson probability distribution.
Compute Cohen's d to measure effect size for both test ( standard deviation 20 and 10) If the population standard deviation is 10.
Setup Null and Alternate hypotheses to test if average amount of soda in each can is less than 32 oz. Test the hypothesis using a = 0.05. What can you conclude from all this?
A large internet retailer, is studying the lead time (elapsed time between when an order is placed and when it is filled) for a sample of recent orders. The lead times are reported in days.
Construct a 95% confidence interval estimate for the average waiting time of all the patients who visit this doctor. Assume the population of waiting times is normally distributed.
An extended-life light bulb claims the bulb has an average life of 12,000 hours, with a standard deviation of 500 hours. If the distribution is bell shaped and symmetrical
What is the level of measurement for the variable, "political ideology" measured as "Very Conservative", "Conservative","Moderate", "Liberal" and "Very Liberal".
Assume that the two tests use different scales to measure the same aptitude. If someone gets a SAT score that is the 67th percentile, find the actual score and the equivalent ACT score.
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