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Four pairs of data (n = 4) yield r = 0.942 and the regression equation y-cap = 3x. Also, the average of the y values = 12.75. What is the best predicted value of y for x = 2.9?
Ten percent of the items produced by a machine are defective. Out of 15 items chosen at random
Cameras yielded an average of 6.8 photos per second with sd of .58 photos per second. Does the sample data present sufficient evidence to reject the manufacturer's claim?
A random sample of 81 students at a local university showed that they work an average of 60 hours per month with a standard deviation of 18 hours. Compute a 95% confidence interval for the mean of t
The number of messages received by a computer bulletin board is a Poisson random variable with a mean rate of 8 messages per hour. What is the probability that fewer than three messages are receive
a person's blood pressure is taken 8 times a day. the probability distribution of each of his readings had a mean of 128 and a standard devation of 9. what is the probability of the sample mean that
When 306 students are randomly selected and surveyed it is found that 115 own a car. Find a 99% confidence interval for the true proportion of all college students who own a car.
How much net revenue does the state expect, on average from each ticket? What is the risk preference of people who play this lottery?
Unknown to an experimenter, the probability that producing a defective part is p=0.25. If 150 such parts are randomly selected what is the probability the point estimate of p will be with .05 true.
Note that under certain conditions choosing projects on the basis of the IRR will not cause any value to be lost because the one with the higher IRR will also have the higher NPV, i.e., no conflict
The engineer can spend $173 for the two components. To the nearest two decimal places, what is the largest component probabilty that can be achieved?
Suppose we wanted the total width of the two-sided confidence interval on the mean life of the bulbs to be 6 hours at 95% confidence, what sample size should be used?
25% during the middle five weeks, and 60% during the last 5 weeks. Would a time-series graph of this data be appropriate? Give a reason for your answer.
The amount of time a bank teller spends with each customer has a mean of 3.10 minutes and standard deviation of 0.45 minutes. A random sample of 36 customers is selected. What is the probability th
It has been estimated that about 30% of frozen chickens contain enough salmonella bacteria to cause illness if improperly cooked. A consumer purchases 12 frozen chickens. What is the probability tha
If you draw a ball, record the color then draw a second without replacing the first ball, what is the probability of choosing two green balls?
The data collected was for each car for each type of fuel. Performance was measured in miles per gallon. Perform an ANOVA test and state the results.
Using random numbers of 0.1567, 0.9823, 0.3419, 0.5572 and 0.7758, compute the time required for each of five simulated maintenance checks of the airplane's landing gear.
Find the transition probability matrix for the shelter. If there are currently 3 dogs in the shelter, what is the distribution of the number of dogs that will be in the shelter in two weeks?
suppose a researcher is testing a null hypothesis that mean(or weird shaped u)= 61. a random sample of n=36 is taken resulting in a sample mean of 63 and s=9. conduct the appropriate hypothesis test
A restaurant owner wishes to find the 99% confidence interval of the true mean cost of a dry martini. How large should the sample size be if she wishes to be accurate within $0.10. A previous study
Of total population of American households, including older Americans and perhaps some not so old, 17.3% receive retirement income. In a random sample of 120 households what is the probability that
The national automobile repair franchise SuperSpeedyService claims it can complete a full 50,000 mile warrantee servicing in less than 5.5 hours. Formulate a hypothesis test to evaluate the claim.
Either the seed germinates, or it does not. What is the sample space in this problem? Do the probabilities assigned to the sample space add up to 1? Explain. Are the outcomes in the sample space equ
We are interested in selecting a sample of 5 flights and calculating the probability of all of them getting to their destination on time.