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Assume that a factory has two machines. Past records show that Machine 1 produces 30 per cent of the output. 5 per cent of items produced by Machine 1 were defective and only 1 per cent produced by Machine 2 were defective. If an item selected at random is found to be defective, what is the probability that it was produced by Machine 2.
Given that we have collected pairs of observations on two variables X and Y , we would consider fitting a straight line with X as an explanatory variable if:
Draw the histogram showing population distribution. Locate value of population mean in your sketch and make the estimate of standard deviation.
One flight daily to a certain destination. The following information shows the probability distribution of late arrivals for that flight in the past month:
Use this information to set up a 90 percent confidence interval for the proportion, p of all US workers who play hooky.
What is the expected number of baby girls in the sample of 40 births? What is the standard deviation of this binomial distribution?
Using the original data, estimate the population standard deviation with 90% probability.
Suppose that 20% of all Internet users have posted photos online. A sample survey interviews 1555 users. What is the probability that 300 or fewer people in the sample have posted photos online?
The credit score of a 35 year old applying for a mortgage at Ulysses Mortgage Associates is normally distributed with a mean of 600 and a standard deviation of 100.
The p-value of the test is closest to:
Using hypergeometric distribution, determine the probability that the sample of 6 will comprise 2 nonconforming watches?
What is the probability the average of the sample is more than $38000 and What is the standard deviation of the sample mean
Suppose you wish to build a spa on a wood deck. The deck is to be built 4 ft above level ground. It is to be 50 ft by 30 ft and is to contain a spa that is circular with a 14-ft diameter. The spa is 4 ft deep.
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