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A certain brand of automobile tire has a mean span of 3500 miles and a standard deviation of 2000 miles. (assume the life spans of the tires have a bell-shaped distribution)
The life span of a randomly selected tire is 33160 miles.What is the x-z-score that corresponds to this life spans?
The life span of the randomly selected tie is 3300 miles, Using the Empirical Rule, find the precentile that corresponds to the life span.
A person must score in the upper 2% of the population on an IQ test to qualify for member ship in Mensa, the international high-IQ society. If IQ scores are normally distributes with a mean of 100 and a standard deviation of 15, what score must a ..
What is meant by illusionary correlations? Why is it so difficult for individuals to disprove their beliefs in correlations that are actually false?
A chemical process converts lead to gold. However, the production varies due to the powers of the alchemist. It is known that the process is normally distributed, with a standard deviation of 2.5 g. How many samples must be taken to be 90% certain..
Experience has shown a company that the cost of delivering a small package within 24 hours is $14.80. The company charges $15.50 for shipment but guarantees to refund the charge if delivery is not made within 24 hours.
The average number of television sets in the sample households turns out to be 1.86, and the SD is 0.86. Find a 95% confidence interval for the average number of television sets per household.
It is suspected that the mean turnover has changed and is not 6.0. Use the .05 significance level.
A committee of three is selected at random from a set consisting of five Democrats, eight Republicans, and two Independents.
Use this information to set up a 90 percent confidence interval for the proportion, p of all US workers who play hooky.
A sample of 40 decaffeinated-coffee drinkers showed a mean of 5.84 cups per day, with a standard deviation of 1.36 cups per day. Use the .01 significance level. Compute the p-value.
We can compare two sample means to determine if the samples were obtained from normal populations with the same mean using the "t" distribution.
If sample mean is M=44. Is this sufficient to demonstrate significant effect? Again assume a Two-tailed test with a=0.05.
A drug manufacturer wants to estimate the effect of its new drug designed to increase patients white blood cell count.
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