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He thought that knowing the probability of serving 12 customers per 15 minutes could be helpful to him in the decision making process.
In addition to the 90% confidence interval, also find the 95% confidence interval. Compare the margin of error of the two intervals.
The time between calls to a corporate office is exponentially distributed with a mean time of 10 minutes. What is the probability of more than 3 calls in one-half hour
What proportion of people have IQ scores between 82.0 and 121.0? What proportion of people have IQ scores higher than 130.0?
For your second part, describe how your report could make a type I error and a type II error.
Considering a system with three redundant components having constant but different failure rates ?1, ?2 and ?3. Derive the R(t) and MTTF for the system.
Find out the probability of type I error if exactly 60% of the voters favor the employ of these fuels. What is the type II error probabiliy B(beta) if 75% of the voters favor this action. (Use norma
For a fluid injection company, quantity injected per container is approximately normally distributed with a mean of 10 units and standard deviation .2 units. Each unit of fill costs $20 per unit. if
Find the probability that nine randomly selected females from the described population would have a mean height X that is greater than 65 inches?
Find the expected value and the variance of the number of inspected bottles with series defects. This is from the section about expected values of random variables.
A flashlight contains two batteries each having an MTTF of 5 operating hours with constant failure rate. What is the probability of battery failure occurring within the first 2 hours of operation?
Based upon a random sample of 16 customer transactions the mean waiting time is 6.3 minutes and standard deviation is 2 minutes per customer. Test the manager's claim at 5% as well as 1% significanc
Calculate the appropriate test statistic to test the hypotheses related to the concern and test at 5% and 1%.
The ages of the ten students are listed in years:{ 17,22,19,24,21,23,29,18,22,28 }. Determine the mean, median, mode, sample variance, and range.
A human proofreader will catch 90% of nonword errors as well as 70% of word errors. What percent of errors will the proofreader catch?
For the following statement, write down the null hypothesis and alternative hypothesis. Also label which one is the claim. Company X claims that the average salary for entry level employee is $35,00
For each of the following combination of the confidence level and sample size determine the appropriate t-value.
A production procedure is checked periodically by the quality control inspector. The inspector chooses simple random samples of 30 finished products and calculates the sample mean product weight.
When coin 1 is flipped, it lands on heads with probability 0.4 when coin 2 is flipped, it lands on heads with probability 0.7. One of these coins is randomly chosen and flipped 10 times.
When the parachute is inspected, the inspector is looking for anything that may indicate the parachute might not open. State the null and alternative hypotheses.
The chair of the board of directors says, "There is the 50 percent chance this company will earn the profit, a 30 percent chance it will break even, and 20 percent chance it will lose money next qua
Using empirical rule, find out the approximate percentage of a normal distribution that is expected to fall in the interval described.
A group of Science Summer Camp students are studying length of minnows in Grand Lake. They take a random sample of 22 minnows and find they have a mean of 7.0 cm and a standard deviation of 2.0 cm.
The college theater department recently staged a production of a modern musical. A researcher recorded the gender of each student entering the theater and found a total of 385 females and 215 males.
Suppose that the sample is drawn and z(a/2) = 1.65 and s = 35. Answer the following questions: If the Maximum Error of Estimate is 0.05 for this sample, what would be the sample size?