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The U.S. government recently reported that the proportion of people feeling negative about the economy was only 30%. However, a recent poll by CNN/Gallup found that in a sample of 1000 people 450 of them felt negative about the economy. Conduct a hypothesis test to determine if the proportion of people feeling negative about the economy is really 30% or not (Hint: ). Assume Alpha = .05 and remember to clearly state the null and alternate hypothesis as well as your conclusion about the proportion of people who are feeling negative about the economy.
Service A delivers the document with probability 0.9, Service B with probability 0.9 and Service C with probability 0.8. What is the probability that at least one copy of the document will be delivered on time?
Could you please show me how you computed the two critical values to (2.18, 17.83) ? Which formula you used ?
This confidence interval can't be trusted to give information about the spending plans of all adults. Why not?
Angela works as a quality supervisor. She has uncovered a quality issue with safety brackets on baby swings. Angela determines that 21% of the safety brackets are out of spec.
Calculate the 95% confidence interval for the rate of positive tuberculin reaction separately for each of the two subpopulation, those with high exposure and those with low exposure.
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. For 26 younger men the sample standard dev..
A typical problem statement is correlation research is _____________
Find the area under the normal distribution curve between z = 1.52 and z = 2.43.
If random sample of size n = 16 are selected, can we say anything about the xbar distribution of sample means?
Test for single mean - What do you conclude - Compute z and P
Suppose it costs $2,500 to buy a defibrillator. Find the expected value of owning a defibrillator if there is a 4% probability that "Silver's Gym" will lose a lawsuit regarding its operation, with each lawsuit resulting in "Silver's Gym" being lia..
Explain why random samples are preferred to nonrandom samples.
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