A consumer believes the veggie manufacturer is under-filling its frozen peas. The true mean weight stated on the package is 500 g. By weighing a sample of 9 packages, he will reject the null hypothesis if the sample mean is less than 496.8 g. Assume the weights of packages follow... Solved Statistics 1 Week Ago Bookmark

A consumer affairs investigator records the repair cost for 4 randomly selected TVs. A sample mean of $87.52 and standard deviation of $19.29 are subsequently computed. Determine the 80% confidence interval for the mean repair cost for the TVs. Assume the population is approximately normal. Step 2 of 2: Construct... Solved Statistics 1 Week Ago Bookmark

A consumer advocate claims that 70 percent of cable television subscribers are not satisfied with their cable service. In an attempt to justify this claim, a randomly selected sample of cable subscribers will be polled on this issue. Suppose that the advocate's claim is true, and suppose that a random... Solved Statistics 1 Week Ago Bookmark

A consumer advocacy group tested the "on-air" lifetimes a random sample of 162 cell phone batteries. The mean lifetime was 2.9 hours with a standard deviation of 0.4 hours. The lifetimes are approximately bell-shaped. Estimate the number of batteries with lifetimes between 2.1 hours and 3.7 hours.... Solved Statistics 1 Week Ago Bookmark

A consumer advocacy group published a study of labeling of seafood sold in three U.S. states. The group purchased 209 pieces of seafood from various kinds of food stores and restaurants in the three states and genetically compared the pieces to standard gene fragments that can identify the species. The... Solved Statistics 1 Week Ago Bookmark

A consumer advocacy group claims that the mean mileage for the Carter Motor Company's new sedan is less than 32 miles per gallon. Identify the type I error for the test.... Solved Statistics 1 Week Ago Bookmark

A consulting group recently conducted a global survey of product teams with the goal of better understanding the dynamics of product team performance and uncovering the practices that make these teams successful. One of the survey findings was that 32% of organizations have a coherent business strategy that they stick... Solved Statistics 1 Week Ago Bookmark

A claim is made that a process can product a boll with diameters having normal distribution with mean .55 inches and s.d. .01 inch. A bolt was chosen from the stock and is found to have a diameter exceeding .58 in. Do you suspect the truth of the claim? Why?... Solved Statistics 1 Week Ago Bookmark

A chemical flow control device underfills 10% of all barrels. A sample of 10 barrels is randomly selected. Determine the probabilities for the following number of underfilled barrels. exactly 3. at least 1. at most 2.... Solved Statistics 1 Week Ago Bookmark

A consulting firm had predicted that 35% of the employees at a large firm would take advantage of a new company Credit Union, but management is skeptical. They doubt the rate is that high. A survey of 300 employees shows that 138 of them are currently taking advantage of the... Solved Statistics 1 Week Ago Bookmark

A construction company in Naples, Florida, is struggling to sell condominiums. In order to attract buyers, the company has made numerous price reductions and better financing offers. Although condominiums were once listed for $300,000, the company believes that it will be able to get an average sale price of $210,000.... Solved Statistics 1 Week Ago Bookmark

A construction company employs three sales engineers. Engineers 1, 2, and 3 estimate the costs of 30%, 20%, and 50%, respectively, of all of the jobs bid by the company. For i = 1, 2, 3 define Ai to be the event that a job is estimated by engineer I,... Solved Statistics 1 Week Ago Bookmark

A) Construct an interval estimate of ? with 95 percent confidence. (Round your critical t-value to 3 decimal places. Round your answers to 3 decimal places.) B) Construct an interval estimate of ? with 95 percent confidence, assuming that s =... Solved Statistics 1 Week Ago Bookmark

a) Construct a 99% confidence interval for , the true mean thickness. Interpret the results. b) Find the sample size required to estimate the true mean thickness to within 0.2 mm using a 99% confidence interval.... Solved Statistics 1 Week Ago Bookmark

a) Construct a 95% confidence interval for mu1 (213,872) -- Standard deviation: 69,261, the expected price of real estate in the zone1 and for mu2 (256,684) -- Standard deviation: 93,192, the expected price of real estate in zone 2. Are the confidence intervals overlapping ? Check all the necessary assumptions... Solved Statistics 1 Week Ago Bookmark

A) Construct a 90% confidence interval to estimate the population proportion with a sample proportion equal to .35 and a sample size equal to 120. use the cumulative probabilities for the standard normal distribution table lower limit _____ upper limit_____ B)... Solved Statistics 1 Week Ago Bookmark

a) Construct a 90% confidence interval for , the true mean thickness. Interpret the results. b) Find the sample size required to estimate the true mean thickness to within 0.2 mm using a 90% confidence interval.... Solved Statistics 1 Week Ago Bookmark

a) Consider the map P: N-->N which sends (a,b) to (2^a)(3^b). Prove that P is injective. Conclude that NxN is countably infinite. (*Note: N is the natural numbers) b) For all n let Jn = [(n-1)/n, (n+1)/n]. Prove that ?Jn = {1} (*Note: ?Jn is from n=1... Solved Statistics 1 Week Ago Bookmark

A conical tank has height 3 m and radius 2 m at the top. Water flows in at a rate of 2.6 m3/min. How fast is the water level rising when it is 2.2 m from the bottom of the tank?... Solved Statistics 1 Week Ago Bookmark

A civil engineering company, based on past experience, believes that in 40% of cases bridges collapse due to construction problems, 45% of cases bridges collapse due to design problems, and 15% of cases bridges collapse due to other problems such as earth quakes, heavy vehicular laods etc. Danny is a... Solved Statistics 1 Week Ago Bookmark

A congressional comitteis studying hospital costs of daily patient care, The figure is needed in a hurry andthe effort to determine daily costs at each hospital is considered. Thus the comittee decides to take a randomsample of 100 hospitaals in the country and to make a 90% confidence interval estimate... Solved Statistics 1 Week Ago Bookmark

A confidence interval with a 95% confidence level for the proportion of voters who are in favor of the proposition in a referendum is (0.58, 0.63). How many persons were surveyed in this poll?... Solved Statistics 1 Week Ago Bookmark

A confidence interval was used to estimate the proportion of statistics students who are female. A random sample of 72 statistics students generated the following confidence interval (.438,.642). Using the information above, what sample size would be necessary if we wanted to estimate the true proportion to within 3% using... Solved Statistics 1 Week Ago Bookmark

A confidence interval is constructed for the difference in mean number of hours of sleep high school boys get and the mean number of hours of sleep high school girls get. The 95% confidence interval is (–0.75, 1.12). Which statement is true? A. Because 0 is in... Solved Statistics 1 Week Ago Bookmark

A confidence interval for the population mean computed from an N of 16 ranges from 12 to 28. A new sample of 36 observations is going to be taken. You cant know in advance exactly what the confidence interval will be ... Solved Statistics 1 Week Ago Bookmark

A confidence interval for a population proportion uses the uniform distribution to approximate the binomial distribution. True or False?... Solved Statistics 1 Week Ago Bookmark

A confidence interval for a population mean has length 22. a) Determine the margin of error. b) If the sample mean is 56.2, obtain the confidence interval.... Solved Statistics 1 Week Ago Bookmark

A confidence interval for a population mean has a margin of error of 3.6. Determine the length of the confidence interval. If the sample mean is 45.4, obtain the confidence interval. The length of the confidence interval is. The confidence interval for mu is from to .... Solved Statistics 1 Week Ago Bookmark

A confectionery company has to decide whether to launch a new range of chocolate bars aimed at health conscious professional people. You have been invited to observe all stages of the decision process and to attend meetings relating to the decision. What criteria would you use to judge the quality... Solved Statistics 1 Week Ago Bookmark

A cone floats on the surface of a tank filled with oil. If the specific gravity of the cone is 0.6 and the specific gravity of the oil is 0.9, what is the ratio of the distance a to the distance h.... Solved Statistics 1 Week Ago Bookmark

A civil engineer is analyzing the compressive strength of concrete. Compressive strength is approximately Normally distributed with variance sigma^2 = 1000 psi^2. A random sample of n = 12 specimens has a mean compressive strength of bar x = 3222.5 psi. Let mu be the true mean compressive strength of... Solved Statistics 1 Week Ago Bookmark

A concrete slump test is a test to measure how hard and consistent a given specimen of concrete is before curing/hardening. Suppose 35% of the concrete specimens taken from a given batch of fresh concrete have a slump of less than 2”. What is the probability of the following, among... Solved Statistics 1 Week Ago Bookmark

A concrete mix is designed to withstand 300 pounds per square inch (pst) of pressure. The following data represent the strength of nine randomly selected casts 3970, 4100, 3100, 3200, 2930, 3840, 4100, 4030, 3400 Compute the mean, median and mode strength of the concrete Compute the mean strength of... Solved Statistics 1 Week Ago Bookmark

A concrete mix is being designed to provide adequate compressive strength for concrete blocks. The specification for a particular application calls for the blocks to have a mean strength greater than 1350 KPa. A sample of 20 blocks is produced and tested. Their mean compressive strength is 1356 KPa, with... Solved Statistics 1 Week Ago Bookmark

A concrete beam may fail either by shear (S) or flexure (F). Suppose that three failed beams are randomly selected and the type of failure is determined for each one. Let X = the number of beams among the three selected that failed by shear. List each outcome in the... Solved Statistics 1 Week Ago Bookmark

A concert planner usually charges $18 for tickets to a concert. At this price, there is an average attendance of 1500 people. For every $1 increase in admission, there is a loss of 90 customers from the average number. Also,every customer spends an average of $6.50 on concessions and merchandise.... Solved Statistics 1 Week Ago Bookmark

a concerned group of citizens wants to show that less than half the voters support the president's handling of a recent crises. If a random sample of 500 voters gives 228 in support, what does the test conclude? Test at 0.05 significance leve... Solved Statistics 1 Week Ago Bookmark

A computer system, uses passwords that contain exactly eight characters, and each character is one of 26 lower-case letters (a-z) or 26 upper-case letters (A-Z) or 10 integers (0-9). Let S2 denote the set of all possible passwords, and let A and B denote the events that consist of passwords... Solved Statistics 1 Week Ago Bookmark

A computer software company sells 20,000 copies of a certain computer game each year. It costs the company $1.00 to store each copy of the game for one year. Each time it must produce additional copies, it costs the company $625 to set up production. How many copies of the... Solved Statistics 1 Week Ago Bookmark

A computer scientist is studying the tendency for computers running a certain operating system to run more slowly as the computer ages. They measure the opening time of a particular computer program when the computer is one month old versus the computer at six months. Here are the results of... Solved Statistics 1 Week Ago Bookmark

A computer repair service found that a random sample of 45 repair costs had a mean cost of $659. Assume that the population standard deviation is $125. Calculate the margin of error, E, for a 95% confidence interval for the population mean .... Solved Statistics 1 Week Ago Bookmark

A city's police department plans to enforce speed limits by using radar traps at four different locations. During morning rush hour, the radar traps at locations L1, L2, L3, L4 are operated with probabilities 0.4, 0.3, 0.2, and 0.3, respectively. A person speeding to work has probabilities of 0.2, 0.1,... Solved Statistics 1 Week Ago Bookmark

A computer professor is interested in studying the amount of time it would take students enrolled in the Introduction to Computers course to write and run a program in Matlab. The professor hires you to analyze the following results m minutes from a random sample or 9 students: At the... Solved Statistics 1 Week Ago Bookmark

A computer password must be 8 characters long. How many passwords are possible if only the 26 letters of the alphabet are allowed? Show your work.... Solved Statistics 1 Week Ago Bookmark

A computer password consists of eight characters, How many different passwords are possible if each character may be any lowercase letter or digit? How many different passwords are possible if all characters are lower case letters? What is the probability of generating a password with all lowercase letters, if a... Solved Statistics 1 Week Ago Bookmark

A computer manufacturing company wishes to determine the mean life length of a certain type of computer chip. A random sample of 8 computer chips produced the following life length in hours: 99 145 131 179 102 133 107 150 The sample mean and the sample standard deviation are 130.75... Solved Statistics 1 Week Ago Bookmark

A computer lab has 6 computers. Let X be the number of computers in use at a particular time of day. Suppose that the pmf of X is given by p(0) = .05, p(1) = .10, p(2) = .15, p(3) = .25, p(4) = .20, p(5) = .15, and p(6)... Solved Statistics 1 Week Ago Bookmark

A computer has a two-level cache. Suppose that 60% of the memory references hit on the first level cache, 35% hit on the second level, and 5% miss. The access times are 5 nsec, 15 nsec, and 60 nsec, where the times for level 2 cache and memory start counting... Solved Statistics 1 Week Ago Bookmark

A computer has 3 processors that receive n jobs, with the jobs assigned to the processors purely at random so that all of the 3^n possible assignments are equally likely. Find the probability that exactly one processor receives no jobs. please show work... Solved Statistics 1 Week Ago Bookmark

A computer hacker is trying to break into a computer system by guessing the system administrator's password. The hacker can try 7 passwords a minute, but if he tries unsuccessfully for more than 9 minutes a day, he will get caught. If he limits his attempts to at most 9... Solved Statistics 1 Week Ago Bookmark