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1. The sample size necessary for a 90% confidence interval to keep the maximum error to within 1/2 of a standard deviation, sigma is known but not given ______ samples
2. The sample size necessary for a 98% confidence interval within 0.02 for a proportion which has a prior population proportion estimate of 0.32 ____ samples
3. The sample size necessary for a 98% confidence interval within 0.02 for a proportion with NO prior population proportion estimate ____ samples
Suppose you toss a die 100 times in a row. What is the probability that you see 4 spots between 10 and 20 times?
Assume that company A makes 80% of all electrocardiograph machines, company B make 15% of them, and the company C makes the other 5%.
Let mutually independent random variables X1, X2 and X3 be N(0,1), N(2,4) and N(-1,1) respectively. Compute the probability that exactly two of these three variables are less than zero.
The Rio-River Railroad, headquartered in Santa Fe, New Mexico, is trying to devise a method for allocating fuel costs to individual railroad cars on a particular route between Denver and Santa Fe.
A standard deviation of $1500. at the 0.01 level of significance, can it be concluded that state employees earn on average less than federal employees?
After 1,000-trial simulation, examine statistical information generated and compare output of simulation with your findings in Problem .Briefly describe the significant similarities and differences.
The average labor charge for automobile mechanics is $54 per hour. The standard deviation is $4. Using Chebyshev's theorem, find the percentage of data values that will fall in the range of $48 to $60.
a survey of 61647 people included questions about office relationships. of the respondents 26 reported that their
if a data set has correlation coefficient equal to 0.9 which of the following is necessarily true about the data points
a distribution has a standard deviation of s 12. find the z- score for each of the following locations in the
What factors determine how happy workers are in their jobs and use the following data and multiple regression to produce a model to predict employee satisfaction
The nicotine patch group had abstained from smoking, as 87 in the patch plus drug group. is this good evidence that adding bupropion increases the success rate?
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