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A producer of a certain type of electronic component ships to suppliers in lots of twenty. Suppose that 60% of all such lots contain no defective components, 30% contain one defective component, and 10% contain two defective components. A lot is picked, two components from the lot are randomly selected and tested, and neither is defective.
(a) What is the probability that zero defective components exist in the lot?
(b) What is the probability that one defective exists in the lot?
(c) What is the probability that two defectives exist in the lot?
An airline has surveyed a simple random sample of air travelers to find out whether they would be interested in paying a higher fare in order to have access to e-mail during their flight.
What is our decision regarding the differences between the observed and expected frequencies if the critical value of chi-square is 9.488 and the computed value is 6.079?
For each of the following sampling scenarios, determine which test statistic is appropriate to use when making inference statements about the population mean.
ComputerWare asked 500 of its iMac purchasers what computer they owned or had owned. There were 83 new computer owners, 60 who had owned a Windows-based computer, and 357 who had owned a Macintosh.
What sampling method did you use? Construct a 95% confidence interval for the true population proportion of the SUV's. What sample size would be needed to ensure an error of +/- 0.025 with 95% confidence?
Using the Hypothesis Tests Two Sample file and a .05 significance level, test whether there is a difference in the mean salary for men versus women.
What is the probability that 30 or more paid by credit? d. What is the probability that less than 12 paid by credit? e. What is the probability that 12 to 30 paid by credit?
Are you doubtful of any of these data points? if so why does there show to be a linear relation between degree of stenosis and nuber of reactive nuclei?
A random sample of 100 peaches is gathered and the mean diameter is calculated. What is the probability that the sample mean is greater than 3.79 inches.
when supermarket customers are offered free samplesthey take them 60 of the time. when 317 customers are observed what
The midpoint for each class (enter in table above): Calculate the estimated arithmetic mean of the sample Calculate the estimated arithmetic median of the sample
A recent article in a computer magazine suggested that the mean time to fully learn a new software program is 40 hours. A sample of 100 first-time users of a new statistics program revealed the mean time to learn it was 39 hours with the standard dev..
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