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The guidance system of a ship has four modules that must maintain all function properly for the system to work. Two of the modules have reliability of .85, the other two have reliability of .95 each.
a) Compute the reliability of the system.
b) A backup system with the same components will be added to the ship. The backup will be switched on automatically if the first system fails. Assuming that the switch to the backup works 95% of the time, what is the reliability of the ship's guidance system now?
Based on this sample information find out what percent of variation in starting salaries is described by GPA, and find out the equation that would forecast salary from GPA. Give a scatter plot.
for a random sample of 50 measurements on the breaking strength of cotton threads the mean breaking strength was found
On average, you receive 2 telemarketing calls per day. What is the probability that you will not receive any telemarketing calls today.
There are four levels of measurement, two are numeric and two are attribute data. This first time around, try to identify if a question produces a number or a text number.
What is the predictive value of a negative test result? In other words, what is the probability that an individual who returns a negative tests for hypertension is not hypertensive? Please give your answer to 3 decimal places.
A U.S. Travel Data Center survey of 1500 adults found that 42% of respondents stated that they favor historical sites as vacations. Find the 99% confidence interval of the true proportion of adults who favor visiting historical sites as vacations.
A cut-off time is set at the slowest 10% of the learning distribution. Anyone slower than this cut-off time is definitely not hired. What proportion of the candidates will be hired automatically?
Test against the null hypothesis of a one sided alternative that the difference is more than 10 minutes. Use a .1 level of significance (alpha).
The weights of adult males is normally distributed with a mean of 200 pounds and a standard deviation of 40 pounds. Calculate the probability that an adult male weighs less than 130 pounds.
Give an estimate of the change in expected peak voltage with a 1% increase in light absorption. Estimate the expected value of peak voltage when % light absorption is 20.
In how many ways can at least one of the 3 selected vials have a hairline crack if the order of selection does not matter?
a number of tubes of toothpaste purchased by a typical family is a random variable having a poisson distribution with
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