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A shipment of 7 television sets contains 2 defective sets. A hotel makes a random purchase of 3 of the sets. If x is the number of non-defective sets purchased by the hotel, find the probability dis
Test the null hypothesis that these Arizona students scored the same as the North Dakota students. (238 North Dakota students had a mean of 525)What t-statistic do you obtain?
A vendor at the a baseball stadium must decide whether to sell ice cream or soft drinks at today's game. The vendor believes that the profit will depend on the weather. On the basis of her past expe
Suppose 70% of kids who visit a doctor, have a fever, and 20% of kids with a fever have a sore throat. What's the probability that a kid who goes to the doctor has both a sore throat and a fever?
The amount of time a teller spends with each customer has a population mean of 3.10 minutes and standard deviation of 0.40 minute. If you select a random sample of 16 customers,
16 wires is selected and each is tested to determine the tensile strength. the resulting sample mean and standart deviation are 2160 and 30 respectively.
The probability that a house in an urban area will be burglarized is 8.5%. If 45 houses are randomly selected, what is the probability that four of the houses will be burglarized?
This semester a sample of 45 students revealed an average cost of books of $395 per student. The Dean of Students believes that the costs are greater this semester. What is the test value for this h
Plot the market-share data. Make a forecast for 2004 by using a trend model of your choice or a judgment forecast.
Creek Ratz is a very popular restaurant located along the coast of northern Florida. They serve a variety of steak and seafood dinner. During the summer beach season, they do not take reservationhs
Determine the frequency of wrong numbers given to callers. Each sample consisted of 100 calls. Determine 95 pct limits. Is the process stable(i.e., in control)? explain.
Three data entry specialists enter requisition into a computer. Specialist 1 processes 30% of the requisitions, specialist 2 processes 45%, and specialist 3 processes 25%. The proportions of incorre
a grocery store manager discovers that on any given weekend 70% of the customers sales amount to more than $100. What is the probability that the first 2 sales will be over $100?
Calculate the profit earned/loss incurred on; a high performance tire that exceeds 40,000 miles, a high performance tire that does not exceed 40,000 miles.
A high of 10 was possible. A sample of five tests was selected from each group. The test grade results are found below. At the 0.01 level, how many treatments are involved?
A sprinkler system inside an office building has two types of activation devices, D1 and D2, which operate independently. When there is a fire, if either device operates correctly, the sprinkler sy
Of 10,000 students at a college, 2,500 have a Mastercard (M)m 4000 have a VISA and 1,000 have both. Find the probability that a randomly selected student has neither credit card.
C-Spec, Inc., is attempting to determine whether an existing machine is capable of milling an engine. Calculate the (capability index) for this machine.
The length of pregnancies are normally distributed with a mean of 268 days and standard deviation of 15 days. How many days do 80 percent of women last until in their birthing process?
We have learned how to construct confidence intervals for the variance of a normal distribution -- we do that using a chi-square distribution.
Determine whether the hypothesis test involves a sampling distribution of means that is a normal distribution, Student t distribution, or neither.
What is the probability that half or more of the claims have been padded? Round your answer to the nearest thousandths place.
Carter Motor Company claims that its new sedan, the Libra, will average better than 19 miles per gallon in the city. Assuming that a hypothesis test of the claim has been conducted and that the conc
Assume the probability that a person has the desease is 0.03 for all people, independently of each other, and compute the expected number of tests necessary for each group.