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What is the smallest sample size required to provide a 95% confidence interval for the mean if it is important that interval be no longer than 1cm? You may assume that the population is normal with variance 9 CM2.
The quality-control manager at a light bulb factory needs to determine whether the mean life of a large shipment of light bulbs is equal to 375 hours. The population standard deviation is 100 hours.
A recent marketing and promotion campaign by Charles of the Ritz more than doubled the sales of the suntan lotion Bain de Soleil.
Use the normal distribution of SAT critical reading scores for which the mean is 507 and the standard deviation is 121. Assume the variable x is normally distributed.
The Investment Research Institute reported in its Mutual Fund Fact Book that the number of mutual funds increased from 5725 in 1999 to 7977 in 2009. What is the geometric mean annual percent increase in the number of funds?
Find the probability that the employee will arrive between 8:05 a.m. and 8:40 a.m. Round your answer to four decimal places, if necessary.
chi-square test for independent attributes.on the most recent tax cut proposal a random sample of democrats and
What is the probability of getting different numbers each roll in Yahtzee
Experience suggests that 4 percent of all college students have had a tonsillectomy. In a sample of 300 college students, we need to find the probability that at least 10 have had a tonsillectomy. It is acceptable to use the normal distribution to..
Supposing a linear relationship, use the least squares method to find the regression coefficients b 0 and b 1 .
Analyze data mining and explain the importance of data mining, and examine its implementation in four real-world scenarios.
Assume that the distribution is normal. Based on the Empirical Rule, how many students scored between 57 and 93?
the time t between emissions radioactive emissions has an eponential distribution with a mean of 4 seconds between
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