Average of the means
If a population has a standard deviation of 18, what is the minimum number of samples that need to be averaged in order to be 95% confident that the average of the means is within 2 of the true mean?
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The mean length of steel beams manufactured by a properly-working machine is 3.2 meters. An industrial engineer wants to make sure that the machine in not operating incorrectly.
What is the expected number of coneflowers in your bouquet? What is the expected number of lilies in your bouquet?
How do I find the percentage of scores that fall at or below a person with a score of 7? And percentage of scores that fall above a person with a score of 6?
A = event the student is between 21 and 35 inclusive B = event the student is 26 or over Determine the number of outcomes that comprise the event (A and B). 2234 6302 4291 2011
A bank estimated the average amount of money withdrawn from its ATM machines over weekends exceeds $150 per customer with population standard deviation $35. A random sample of 49 customer transactions is selected and it shows a mean of $161.
How many different ways can you select the accounts so that there is at least 3 accounts that have errors in them? If the 7 accounts are selected at random, what is the probability that either 4 or 5 of the accounts have errors in them?
Serum ferritin is used in diagnosing iron deficiency. In a study conducted recently researchers discovered that in a sample of 28 elderly men the sample standard deviation of serum ferritin was 52.6 mg/L.
The purpose of this process is to ensure the defect rate is no more than 6%. Occasionally, by bad luck, even if the defect rate is no more than 6%, more than one defective tire is found from the chosen 16. What percent of the time does this happen
Consider a hypothesis test of difference of means for two independent populations x1 and x2. Suppose that both sample sizes are greater than 30 and that you know standard deviation 1 but not standard deviation 2.
On each visit the weight of sand you take home (measured in ounces), varies, but follows a U(10-sqt(48)/2, 10+sqt(48)/2) distribution. Assuming the amounts you take home on each trip are independent, estimate the probability that you have collecte
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