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The average gas mileage of a certain model car is 30 miles per gallon. If the gas mileages are normally distributed with a standard deviation of 2.1, find the probability that a car has a gas mileage of between 29.2 and 30.3 miles per gallon.
Compute the value of the test statistic. (Negative amount should be indicated by a minus sign. Round your answer to 2 decimal places.)
Can we conclude from this that most workers there earn between $25 and $35 per hour? Is this right interpretation for margin of error?
A IRS auditor randomly selects 3 tax returns from 48 returns of which 9 contain errors. What is the probability that she selects none of those containing errors? Round to four decimal places.
Will the sum of squared deviation scores be greater for the test or the exam (assume the same number of people sat both the test and the exam)? Why?
Dr. S wishes to measure the effect of TV viewing on reading scores in elementary school children. The data for the sample are shown here. Assume the population is normal.
What was the success probability of each O-ring?
Forty percent of the readings are within 0.5 V of the true value. Estimate the standard deviation for the meter. What is the probability of an error of 0.75 V?
What fraction of the calls last between 4.2 and 5 minutes?
Create a 90% confidence interval for proportion of all kernels that would not pop.
To test the hypothesis that students who finish an exam first get better grades, a professor kept track of the order in which paper were handed in.
Is this correlation statistically significant? He also found the regression coefficient to be -1.66. Is this regression coefficient statistically significant? Explain why or why not for each.
Comparing the results from (a) and (e), what happens to the required sample size when we increase the confidence level?
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