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Rain is forecast half the time in a certain region during a given time period. We estimate that the weather forecasts are accurate two times out of three. Mr. X goes out every day and he really fears being caught in the rain without an umbrella. Consequently, he always carries his umbrella if rain is forecast. Moreover, he even carries his umbrella one time out of three if rain is not forecast. Calculate the probability that it is raining and Mr. X does not have his umbrella.
Determine the margin of error in estimating the population mean. a sample of 68 college students yields a mean annual income of $3248.
First part of this theorem allows a problem solver to compute probabilities about sample means regardless of whether a population is normally distributed.
A survey found that the variance of the rental rates on 8 cars at the airport was 35.7 while the variance of the rental rates on 5 cars down town was 50.4. What test value should be used in a F test?
The standard deviation of the differences d for the paired sample data s d = ____________
according to a recent survey high school girls average 100 text messages daily the boston globe april 21 2010. assume
by the central limit theorem the sampling distribution of x1 - x2 isa. approximately normal for small samplesb.
a random sample of 300 citibank visa cardholders accounts indicated. a sample mean debt of 1220 with a sample standard
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.
suppose that you used a 9-point rating scale and that you wanted to compare men who had an annual income over 50000
Computing from a large sample, one finds the 95% confidence interval for 956; to be {6.8, 14.2}. Based on this information alone, determine the 90% confidence interval for 956
Scores by women on the SAT-I test are normally distributed with a mean of 998 and a standard deviation of 202. Scores by women on the ACT test are normally distributed with a mean of 20.9 and a standard deviation of 4.6.
a 15-ft diameter wind turbine operates in a 25 ftsec wind at 1 atm and 60 degrees f. the turbine is used to pump 60
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