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A machine that produces stampings for car engines is not working properly and prducing 15% defectives. The defective and non defective stampins proceed from the machine on a random manner. If 4 stampings are randomly collected, find
1. The probability that almost 2 are defective2. Mean3. variance and standard deviation
An Electrical firm manufactures light bulbs that have a lifespan that is normally distributed with a mean 900 hours and standard deviation of 50 hours. out of 250 bulbs, about how many bulbs will have lifespan between 970 and 950 hours.
Find a 95% confidence interval for the true proportion of all medical students who plan to work in a rural community.
Calculate the standard deviation of the number of available rooms in that sample. Construct a frequency distribution of the sample mean, and plot a histogram of this distribution.
An entrepreneur owns two hotels, one in the western region of a certain state and the other in the eastern region. He thinks that the average amount spent by guests for lunch at his Friendly Café-West is less than $34.50
In general how is the magnitude of the standard error of estimate related to the value of correlation?
Wall Street securities firms paid out record year-end bonuses of $125,500 per employee for 2005 (Fortune, February 6, 2006). Suppose we would like to take a sample of employees at the Jones & Ryan securities firm to see whether the mean year-end b..
Use the p value method to determine whether or not to accept or reject the null and alternate hypotheses.
Consider you have completed a survey of employees working in a call center doing customer service for a major manufacturing company.
Mention the critical value of test statistic (Or give the p-value of the test.)
In a perfectly symmmetrical distribution: a) the range equals the interquartile range b) the interquartile range equals the mean c) the median equals the mean d) the variance equals the standard deviation
In a column, write the sample space for the experiment that consists of observing the day's production.
By using.02 level of significance, carry out a 5-step hypothesis testing procedure to find out if new processes considerably reduced the wait time.
Using convolution, determine the pdf of a continuous random variable Z where Z = X + Y. Here, X has a uniform distribution on [0, 3] and Y is a constant of value 2. Assume that X and Y are independent.
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