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The resistances of carbon resistors of 1500 ohm nominal value are normally distributed with µ = 1500 and standard deviation = 200.
a. What proportion of resistors is expected to have resistance greater than 1150 ohm?
b. Within plus and minus what amount around the mean do 80 percent of resistances fall?
For the following hypothesis test where H 0 : m £10 vs. H a : m >10, we reject H 0 at level of significance a and conclude that the true mean is greater than 10 when the true mean is really 8.
A firm keeps account for 28 customers. 12 of these are defined as new customers and 14 are locally based. If just 3 new customers live locally, how many established customers do not live locally?
What was the critical F value chosen?
At a = 0.05, can you reject claim that at least 52% of adults are more probable to purchase a product when there are free samples?
A doctor believes that the standard deviation of systolic blood pressure is 450. A random sample of 24 patients found a standard deviation of 520. Assume the variable is normally distributed and a = 0.01. What are the critical values?
At the 5 percent level of significance, can we conclude that the mean weight is greater than 16 ounces? Determine the p- value.
Produce a printout of the frequency tables, showing the total of both frequencies.
Estimate the probability the store will gross over $850 a) Fewer than 5 out of 10 business days.
Test hypothesis that people in State A are more depressed than U.S. population. Illustrate all of your hypothesis steps. (Use alpha = .01.)
For the following scores, find the: A. Mean. B Median. C. Sum of squared deviation. D. Variance. E. Standard deviation.
Calculate the standard deviation for this data = since it is a case of grouped data with classes. use group or class midpoints in the formula in place of x values.
How large a sample is required if the 97 percent level of confidence is used and the estimate is to be within $2,500? The standard deviation is $16,000.
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