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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 below, calc
Perform the appropriate test to substantiate Kumon's claims. Are there any confounding factors regarding the claim?
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 standard deviation speed of the 269 travelers who were arriving was 34 feet per minute. Assuming walking speed is normally distributed, does the evidence suggest the standard deviation walking s
Claim: Movie patrons have IQ scores with a standard deviation that is less than the standard deviation of 15 for the general population. A simple random sample of 40 movie patrons results in IQ scor
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 dev
Today's local newspaper lists 22 stocks "of local interest." Of theses stocks, eleven increase, five decreased, and six remained unchanged yesterday. If we decide to buy two of the stocks, what is t
The revenues of the top eleven personal computer manufacturers are given (in hundred millions)
Using the emperical rule, what is the approximate percentage of the men between the following values. A: 159 cm and 179 cm. B: 164 cm and 174 cm
Let p represent the probability that a defect occurs at any of the 100 points of the waiter. If you assume that the number of defects per wafer produced from Company X follows B(n=100, p=0.08), what
What are some of the important factors that have brought about the e-global age?
Construct a 90% CI for the true proportion of masks of this type whose lenses would pop out at 250°. (Round your answers to four decimal places.)
Assuming that the heart-rate distribution is (approximately) normal, construct a 98% CI for true mean heart rate of triathletes while swimming. (Round your answers to one decimal place.)
Go a web site for two major professional polling organizations. Study results from two recent polls. Try to find one poll that may be questionable. I want a paragraph for each poll, including the ma
(a) What is the approximate probability that at most 70 are mountain bikes? (b) What is the approximate probability that between 60 and 70 (inclusive) are mountain bikes? (c) What is the approximate
397 of 514 randomly selected U.S. adults interviewed said they would not be bothered if the National Security Agency collected records of personal telephone calls they had made.
Silicone implant augmentation rhinoplasty is used to correct congenital nose deformities. The success of the procedure depends on various biomechanical properties of the human nasal periosteum and f
An article reported that, in a study of a particular wafer inspection process, 356 dies were examined by an inspection probe and 197 of these passed the probe. Assuming a stable process, calculate
A manufacturer of college textbooks is interested in estimating the strength of the bindings produced by a particular binding machine. Strength can be measured by recording the force required to pul
A journal article reports that a sample of size 5 was used as a basis for calculating a 95% CI for the true average natural frequency (Hz) of delaminated beams of a certain type.
Suppose that X, Y, and Z are independent random variables each having a standard normal distribution. Determine P(3X+5Y<8Z-4).