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The length of time for one individual to be served at a cafeteria is a random variable having a lognormal distribution with a mean of 10 minutes and standard deviation of 2 minutes. What is the prob
Consider a test that measures adults memory skills and suppose that scores are bell shaped. You take the test and obtain a score of 254.21 and are told that you are in 96.1th percentile. Your friend
What sample size is needed to estimate the proportion of Americans who favor tougher gun control with 95% confidence and maximum error of 3%.
the chickens were contaminated with campylobacter, 15% with salmonella, and 13% with both. What's the probability that a tested chicken was not contaminated with either kind of bacteria?
Crates of eggs are inspected for blood clots by randomly removing 3 eggs in succession and examining their contents. if all 3 eggs are good, the crate is shipped, otherwise it is rejected. what is
The mean height of a certain kind of plant is 184 centimeters. Suppose we want to carry out a hypothesis test to see if the mean height when these plants are treated with a certain chemical differs
VISA reported with 95% confidence that 19% of those surveyed used checks to pay for purchases. If 1478 people participated in the survey, what was the percentage of error?
The experiment indicates a sample average diameter x BAR = 5.027 millimeters. Does this sample information appear to support or refute the engineer's conjecture?
Your company's internal auditor believes that 10% of the company's invoices contain errors. To check this theory, 20 invoices are randomly selected and 5 are found to have errors. What is the probab
In one town, 54% of all voters are Democrats. If two voters are randomly selected for a survey, find the probability that they are both Democrats.
A newspaper article about the results of a poll states: "In theory, the results of such a poll, in 99 cases out of 100 should differ by no more than 5 percentage points in either direction from what
Democrat and Republican, if two voters are randomly selected for a telephone survey, what is the probability that the first one is a Democrat followed by a Republican?
if i have been approved for a $70,000 loan toward the purchase of a new home at 12% interest. The mortgage is for 30 years. How much are the approximately annual payments of the loan? Hint: Assume y
According to the Cellular Telecommunications Industry Association, the average local monthly cell phone bill is $42. Suppose local monthly cell phone bills are normally distributed with a standard d
What is the best estimate of this value? (c) For a 90 percent confidence interval, the value of t is . (d) The 90 percent confidence interval for the population mean is to
A significance test is used to prevent a machine from under filling or overfilling quart bottles. On the basis of a sample, the null hypothesis is rejected and the machine is shut down for inspectio
What is the probability that her or his mean heart rate before exercise was less than 72? If 25 students were selected at random, what is the probability that their mean heart rate before exercise w
You determined that the distribution of annual salaries of NBA players is bell-shaped and symmetrical about the mean salary, do you think introducing Michael Jordan's last annual salary of more than
A simple random sample of 64 observations was taken from a large population. The sample mean and the standard deviation were determined to be 320 and 120 respectively. The standard error of the mean
What daily distance would be traveled by the 10% of cars that travel the greatest distance? A car is booked out for 5 days. What is the probability that the total distance traveled is more than 1100 k
A university found that 40% of its students withdraw without completing the introductory statistics course. Assume that 20 students registered for the course. Compute the probability that more than
The Web-based company Oh Baby! Gifts has a goal of processing 95 percent of its orders on the same day they are received. If 485 out of the next 500 orders are processed on the same day, would this
In a study shop, a set of data was collected to determine whether or not the proportion of defectives produced. Use a 0.025 level of significance to determine if the proportion of defectives is the sa
Post a contribution to the Discussion Board in a folder titled "Individual Contribution to Group Project" at least 48 hours before deadline for the week's assignment. This process will assist the te
Determine how large a sample would be necessary to estimate the population proportion with a margin of error of .05 at 95% confidence.