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Water specimens contain nitrates, a solution that is dropped into the water will cause the specimen to turn red 95% of the time. When used on water specimens without nitrates, the solution turns the water red 10% of the time. Past experience in the lab indicates that nitrates are contained in 30% of the water specimens that are sent to the lab for testing. If a water specimen is randomly selected
1. from among those sent to the lab, what is the probability htat it will turn red when tested?
2. and turns red when tested, what is the probability that it actually contains nitrates?
Prepare a line graph comparing the linear trend predictions against the original data and what are the forecasts for each of the first six months in 2011 using this technique?
Have X= 1, 4, 3, 2, 5, 6, 0. and Y= 1, 3, 3, 1, 4, 7, 2. I get the least squares equation as y=15/28+23/28x. is it correct? How do I test whether the model can be used for predicting Y? How much of the variation in T is explained by variation i..
The manufacturer of beer kegs claims that 95% of the kegs they produce do not leak after 5 years of use. A bar owner tests the manufacturers claim at the 0.05 significance level. She takes a sample of 200 kegs and finds 185 do not leak. Wha..
The actual amount of icing sugar that a filling machine puts into "180 gram" jars is well modeled as a normally distributed random variable with σ = 1.88 gram. If it is desired that only 1.2% (i.e. 0.012) of these jars are to contain less than 180.00..
Respond to the following: Give two examples as follows: A research situation when you would use a two-sample test with independent samples A research situation when you would use a two-sample test with dependent samples
Define the hypothesis and find the standard error of the difference in the means also find the test statistic - Determine the required sample size to be able to use a 99% confidence interval.
A department store manager has decided that dress code is necessary for team coherence
The shelf life of a battery produced by one major company is known to be Normally distributed, with a mean life of 4 years and a standard deviation of 1 years.
What is probability that Tim gets exactly 12 emails on a particular day?
SPC is one of a number of tools which can be used to improve manufacturing quality standards - Outline two techniques which can be used to decide where to put SPC effort most effectively.
Using the information from part by hand, calculate a 90 confidence interval for the difference of the means for the two time periods.
Estimate the difference between the proportion of the population of low birth weight children and the proportion of the population of normal birth weight children who graduate from high school. Report a standard error for your estimate.
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