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Several psychology students are unprepared for surprise true/false test with 15 questions, and all of their answers or guesses. Determine the mean and the standard deviation for the number of correct
The Medassist Pharmaceutical Company gets large shipments of aspirin tablets and uses this acceptance sampling plan: randomly select and test 19 tablets, then accept the whole batch if there is only
Determine the expected number of people who are unemployed (to 1 decimal)? Determine the variance and standard deviation of the number of people who are unemployed (to 2 decimals)?
A statistics professor has devised a diagnostic test, which, when given during the first class, can accurately predict a student's performance on the final exam. So far data are available for ten st
Judge and Cable (2010) report the results of the study demonstrating a negative relationship between weight and income for a group of women professionals.
In order to determine the average time spent on the computer terminals per student at a local university, data were collected for a sample of 81 business students over a one week period. Assume the
A City Council wanted to determine whether there was a difference in the number of traffic citations issued each day. The following data was gathered. Check the data for evidence that the number of
Random samples of size 525 are taken from an infinite population whose population proportion is 0.3. The standard deviation of the sample proportions (i.e., the standard error of the proportion) is
A possible relationship between a proposed input value and the output value, may be because the possible cause and affect is in reverse. For example it may be proposed that chewing a lot of gum(inpu
A population has a mean of 75 and a standard deviation of 8. A random sample of 800 is selected. The expected value of the population mean is
Commercial real estate prices and rental rates suffered substantial declines in the past year (Newsweek, July 27, 2009). These declines were particularly severe in Asia; annual lease rates in Tokyo,
A recent gasoline survey said that the national average gasoline price was $1.298 a gallon. It was felt that gasoline in Texas was significantly lower than the national average.
The American Resorts hotel chain gives an attitude test to job applicants and considers a multiple choice test question to be easy if at least 80% of the responses are correct.
The student body of large university consists of 60% female students. A random sample of 8 students is chosen. Determine the probability that among the students in the sample exactly three are femal
The value of the probability density function for a uniform distribution ranging between 2 and 6 is
The weight of items produced by a machine is normally distributed with a mean of 8 ounces and a standard deviation of 2 ounces. What is the probability that a randomly selected item will weigh more
The management of the National Private Security Coporation recently conducted a survey of 435 of its employees to determine the average number of hours that each employee sleeps at night.
Estimate the process standard deviation. Set up and apply an EWMA control chart to the data usig lambda = 01 and L = 27
The probability of the occurrence of an event in each performance of an experiment is 0.2. The experiments are carried out successively until the given event occurs.
To calculate monthly typical seasonal indexes, after computing the ratio-to-moving averages, the averages must be:
For a five-year moving average, how many values will be lost at the beginning and end of the time series?
The number of smart phones sold by a cell phone service provider per month is normally distributed with mean 300 and standard deviation of 40.
In 2008 Better Business Bureau settled 75% of complaints they received (USA Today, March 2, 2009). Suppose you have been hired by the Better Business Bureau to investigate the complaints they receiv
A news agency reports that 42% of all Americans are dissastified with the service they receive at their local bank with a margin of error of +/-4.5%. This information really represents a confidence
Assume the scores for a particular test are normally distributed with mean 76 and standard deviation 6. The probability that a student will score 89 or higher is?