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Empirical Rule (68-95-99.7)
The interest rate for the financing of a used car is on average 9% with a standard deviation of 3%. Assuming that interest rates for used car loans are normally distributed, approximately what percent of loans have an interest rate that is between 6% and 12%?
a random sample of size 100 is taken from an infinite population having the mean mu76 and the standard deviation
If a Normal model is useful for describing slalom times, approximately how many of the other 35 skiers finishing the event would you expect skied the slalom faster than Jean-Baptiste?
The posted speed limit on Interstate 70 near Hays, KS is 75 miles per hour, but it is claimed that the mean of the actual speeds of vehicles is greater than 75 miles per hour. Describe the Type II error you could make if you test this claim throug..
The following contingency table of frequencies is based on a 5-year study of fire fatalities in Maryland.- For this table, identify any two events that intersect.
What is the appropriate conclusion based on the outcome of the hypothesis test?
If your data meet the assumptions of the parametric test, why is it preferable to use the parametric test rather than the nonparametric alternative?
Hypothesis test for the difference between two means - Assume the population standard deviations are not the same. At the 0.05 significance level, is there a difference in the mean waiting time?
A tire manufactturer claims that its tires will last an average of 40,000 miles with Standard Deviation of 3000 miles.
A normal population has a mean of 75 and a standard deviation of 5. You select a sample of 40. Compute the probability the sample mean is
For each sample, carry out a Z test using the five steps hypothesis testing with a two-tailed test at the .05 significance level, and make a drawing of the distributions involved.
A professor want to know how students feel about gun control, so he surveys his students asking %60Are you in favor or opposed to gun control.%60 All of his students respond. What is the major source of possible bias in this study?
The director of graduate admissions at a large university is analyzing the relationship between scores on the math portion of the Graduate Record Examination.
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