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The average selling price of BlackBerry smart phones purchased by a random sample of 35 customers in 2010 was $311. Assume the population standard deviation was $35.
a) Construct a 90% confidence interval to estimate the average selling price in the population with this sample.
b) What is the margin of error for this interval?
If random sample of 9 loads is selected for a weight check, determine the probability that mean weight of those loads is more than 40.60 tons.
For a normal random variable X with mean 70 and standard deviation 10. Calculate the probability that 60 80}.
Use this information to construct a probability table, and then calculate each of the following probabilities:
The following data represent the number of weed-eaters sold per month at a local garden shop and their prices
As a condition of employment, Fashion Industries applicants must pass a drug test. Of the last 220 applicants 14 failed the test. Develop a 99 percent confidence interval for the proportion of applicants that fail the test. Would it be reasonable ..
Assume we interested in relationship between the age of individual, as measured by visits. Suppose after selecting 15 members the observation:
Mean and standard deviation are 584.6 and 34.28
What is the probability that the student is married, given the student was female? Your answer should be a decimal fraction accurate to 3 decimal places.
Individual scores of a placement examination are normally distributed with a mean of 84.2 and a standard deviation of 12.8.
1.a forester wishes to predict the volume in cubic feet of usable lumber in a certain species of tree using the height
Seven employees were included from Area A, 9 from Area B and 12 from Area C. The test statistic was computed to be 4.91. What can we conclude at the 0.05 level?
The management of White companies considering a new method of assembling its golf cart. Compute which assembly time using the new method is faster.
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