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The local police department must write on average five tickets per day to keep department revenues at budgeted levels. suppose the number of tickets written per day follows a Poisson distribution with a mean of 8.8 tickets per day. Find the probability that less than six tickets are written in one hour given that the police works for 12 hours.
In Gallup polls taken at different times, subjects were asked if they owned a gun, and the number of yes responses was recorded for each time period. Is this discrete or continuous? why?
The number of mathematics texts actually chosen, construct a table showing the values of the joint probability distribution of x and y.
An investment broker reports that the yearly returns on common stocks are approximately normally distributed with a mean return of 12.4 percent and a standard deviation of 20.6 percent.
Roll a balanced 8-sided dice and a balanced 6 sided die and add the spots on the up-faces. Call the sum X. What is the probability distribution of the random variable X.
In a random sample of 80 items, the defect rate is 5% but the manager claims that this is only a sample fluctuation and production is not really out of control. At the 0.01 level of significance, does the data provide sufficient evidence that the ..
A member of Congress wants to determine her popularity in a certain part of the state. She indicates that the proportion of voters who will vote for her must be estimated within plus or minus 2 percent of the population proportion.
Can college conclude that students in new program are significantly different from rest of freshmen class? Use two - tailed test with a = 0.05.
A health care professional wishes to estimate the birth weight of infants. How large a sample must she select if she desires to be 90% confident that the true mean is within 6 ounces of the sample mean?
Using the raw measurement data presented below, calculate the t value for independent groups to determine whether or not there exists a statistically significant difference between the salaries of female and male human resource managers.
Then, label the one that is the claim being made. An employment agency claims that the mean starting salary for actuary assistants is at least $55,000.
A researcher studies the average distance that 130 people who are living in U.S. urban areas walk each week: What is the size of the sample? Identify the population.
The standard deviation of the sample is 5. find the best point estimate of the mean. find the 95% condidence interval of the mean score for all golfers.
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