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Study of the effects of exercise used rats bred to have high or low capacity for exercise. There were 8 high-capacity and 8 low-capacity rats. The 8 high-capacity rats had mean blood pressure 89 with standard deviation 9, and the 8 low-capacity rats had mean blood pressure 105 with standard deviation 13. Using table C of your textbook (without additional software) what is the margin of error for a 95% confidence interval for the difference of the two means (low capacity - high capacity)? (Answer to the nearest hundredth.)
Determine Probability values based on discrete distribution.You roll a fair die three times.
An aptitude test has a mean of 220 and standard deviation of 10. find the corresponding z score for:
If you did not know anything about standard deviation of population from which sample was taken, find out the 95% confidence interval for mean test score.
Costs of Televisions Listed below are prices (in dollars) and quality rating scores of rare-projection televisions (based on data from Consumer Reports). All of the televisions have screen sizes of 55 in or 56 in.
If possible, determine a 95% confidence interval for average number of television sets in all 50,000 households. If this is not possible, describe why not.
Use the value 20 for the population standard deviation of scores on this subsection.
In exercise identify (a) sample and (b) population. Also, find whether sample is likely to be representative of population.
What is the probability that the mean life-span of a sample of 64 randomly selected bulbs will exceed 727 hours?
Suppose the assembly times follow normal distribution. Find out z values for 29 and 34 hours. What percent of garages take between 32 hours and 34 hours to erect?
Find the most powerful predictor among the six independent variables using regression.
Can we conclude there is a difference in mean number of surgeries performed by hospital or by day of week?
What is the expected value and variance for the number of contacts in eight attempts?
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