Statistically significant and a meaningful result
What do we mean when we say that a statistical result is significant? What is the difference between a statistically significant and a meaningful result? Why is statistical significance important?
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A website manager has noticed that during the evening hours, about 3 people per minute check out from their shopping cart and make an online purchase. She believes that each purchase is independent of others and assumes that the distribution of nu
Six individuals, including A and B, take seats around a circular table in a completely random fashion. Suppose the seats are numbered 1, . . . , 6. Let X =A's seat number andY = B's seat number. If A sends a written message around the table to B i
Are the Smith third graders better at math than third graders throughout the state? Perform the correct statistical test, applying the eight steps of the hypothesis testing process and give examples,
In a random sample 25 days, Jon removes an average of 1588 pounds of waste per day. With a .05 level of significance, can we conclude that the population mean amount of crap Jon disposes of per day is greater than 1500 pounds?
The mean healing time for these subjects is days. We will assume that the standard deviation is days. So, with a significance level of .05, can we conclude that the population mean (for those treated with Formulation CS) is less than 7.6 days? Is
Blair is almost sure that his monthly costs for the past year are not representative of his average monthly costs over the past 20 years.
The mean clotting time of blood is 7.35 seconds, with a standard deviation of 0.35 seconds. What is the probability that blood clotting time will be less than 7 seconds?
One of the requirements of a probability distribution is that the sum of the probabilities must be 1 (with a small amount of leeway alowed for rounding errors). what is the justification for this requirement?
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