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Compute a 95% CI for the true average porosity of a certain seam if the average porosity for 20 specimens from the seam was 4:85. How large a sample size is necessary if the width of the 95% interva
Generate 50 normal distributions with mean= 15 and standard deviation= 3 with a sample size of 30 each. For each of these data sets, calculate the 90% con dence interval. How many of the 50 confiden
On a recent prostate cancer screening test, Bobo received positive results. It is known that this type screening test will show 99 percent positive for people who have cancer and 1 percent positive
The number of taxis arriving at a train station follows the Poisson distribution. The average arrival rate is 30 taxis per hour. Bobo has just missed a taxi. What is the probability that his waiting
The four year graduation rate at the University college of Engineering is 60%. Class of 2015 UNM-COE has 250 students. What is the probability that:
Suppose the weights of the contents of cans of mixed nuts have a normal distribution with mean 32.4 ounces and standard deviation 0.4 ounce. If two packages are randomly selected, what is the proba
A: use the sample data to construct a 95% confidence interval estimate of the percentage of the cell phone users who develop cancer of the brain or nervous system.
The following is a cross-tabulation taken from a subset of the 2010 General Social Survey. Respondents were asked whether they had seen an "X-rated" movie in the last year. For the table
For the same question, a random sample of 400 Kumon students resulted in 130 getting the correct answer. Perform the appropriate test to substantiate Kumon's claims. Are there any confounding factor
The appropriate distribution for calculating the confidence Interval is: z distribution t distribution, Chi Square, Uniform What is the numerical value of the variable from the appropriate distribut
The mean gross annual income of certified welders are normally distruted with the mean of 20,000 and a standard deviation of 2200. The ship building association wishes to find out whether this numb
The distribution of the annual incomes of a group of middle management employees approximated a normal distribution with a mean of $39,924 and a standard deviation of $836. About 60 percent of the i
A statistics instructor collected data on the time it takes the students to complete a test. The test taking time is uniformly distributed within a range of 35 minutes to 55 minutes. Determine the
An experiment involves selecting a random sample of 283 middle managers study. One item of interest is their mean annual income. The sample mean is computed to be $35,420 and the sample standard de
Suppose two fair six-sided dice are tossed and the random variable X is used to represent the sum of the numbers shown by the dice. Compute E [X|X>6] and Var [X|X>6].
Heights of men on a baseball team have a bell-shaped distribution with a mean of 169 cm and a standard deviation of 5 cm. using the emperical rule, what is the approximate percentage of the men betw
The number of defects per waiter, Y, was found to follow a binomial distribution if the manufacturing process is stable and generates defects that are randomly distributed on the waifers. Let p repr
A 6-faced die is rolled two times. Let A be the event that the outcome of the first roll is greater than 4. Let B be the event that the outcome of second roll is an odd number. 8. What is the proba
A newspaper article reported that a poll based on a sample of 1150 residents of a state showed that the state's Governor's job approval rating stood at 58%. They claimed a margin of error of &plusm
It is claimed that a certain type of bipolar transistor has a mean value of current gain that is at least 210. A sample of these transistors is tested. If the sample mean value of current gain is 20
Three couples and two single individuals have been invited to a party. Assume independence of arrivals to the party, and that the probability pf any particular individual or any particular couple ar
Assume that the helium porosity (in percentage) of coal samples taken from any particular seam is normally distributed with true standard deviation :75.
Generate 50 normal distributions with mean= 15 and standard deviation= 3 with a sample size of 30 each. For each of these data sets, calculate the 90% con dence interval.
Suppose the weights of the contents of cans of mixed nuts have a normal distribution with mean 32.4 ounces and standard deviation 0.4 ounce. If two packages are randomly selected, what is the probab