Blood clotting time
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?
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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?
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?
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.
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?
A trucking firm delivers appliances for a large retail operation. The packages (or crates) have a mean weight of 298 lb. and a variance of 2704. (Give your answers correct to four decimal places.)
What is a research question that you would like to answer? Write the null and research hypotheses. Would you use a one- or two-tailed test? Why?
A machine fills cans of soda which are labeled "12 ounces" according to a normal distribution with mean 12.1 ounces and standard deviation 0.1 ounces. If I buy a 12-pack of the soda, what is the standard deviation of the average contents?
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