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An emergency breakdown service suggests that 50% of all drivers are registered with their service. A random sample of 100 people had 45 who were registered. Does this sample support the original claim?
What is the probability of randomly selecting a sample of 30 scores which has a mean attention span equal to or greater than 17 minutes.
The Precision Scientific Instrument Company manufactures thermometers which are supposed to give readings of 0o C at the freezing point of water.
A study of cats and dogs found that 11 of 50 cats and 21 of 50 dogs slept more than 10 hours per day. At the .05 level of significance, is there sufficient evidence to conclude that a difference exists between the proportion of cats and the propor..
To find out whether the course is effective in increasing sales, the appropriate set of hypothesis for testing is:
What is the difference between a one-tail and a two-tail test? How do we identify each? What is meant by a p-value?
The following random sample was collected: 22 33 44 6 The 80% confidence interval for the mean is?
Suppose that, for our sample, the mean weight is 11 pounds. How con?dent can we be that the population mean is between 10 and 12 pounds?
Suppose adults have basically distributed IQ scores with a mean of 100 and an SD of 15. Find P65, the 65th percentile. Use the Z table.
according to a genetics theory a certain cross of guinea pigs will result in red black and white offspring in the ratio
Find the probility that a randomly selected student has neigther credit card. Find the probability that a randomly selected student has a Mastercard or a Visa or both.
If 25 loads are chosen at random for a weight check, find the probability that the mean weight of those loads is less than 44.24 tons. Assume that the variable is normally distributed.
Suppose you want to test the claim the the paired sample data given below come from a population for which the mean difference is ud=0. The mean value of the differences for the paired sample data.
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