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Testing equality of two means.
An independent testing agency has been contracted to determine whether there is any difference in gasoline mileage output of two different gasolines used in the same model automobile. The first gasoline was tested on 200 cars and produced a sample average of 18.5 miles per gallon with a standard deviation of 4.6 miles per gallon. The second was tested on a sample of 100 cars and produced a sample average of 19.34 miles per gallon with a standard deviation of 5.2 miles per gallon. At the .05 level of significance, is there evidence of a difference in performance of the two gasolines?
Construct a 98 percent confidence interval for the true proportion of ranch style homes. (Round your answers to 4 decimal places.)
You have been asked to test whether data support company's claim? Test at α = 0.05. Suppose normality.
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.)
If they enroll this many pupils, how much would they need to charge per pupils in order to realize their profit goal of $5,000.
The probability that husband and wife will b alive after 20 years from now is 0.8 and 0.9 respectively.find the probability that in 20 years time 1. both will b alive 2. neither of them will b alive 3. atleast one of them will be alive?
Use both of these facilities regularly. Given that a randomly selected member uses the tennis courts regularly, find the probability that they also use the golf course regularly.
Given a normal distribution of data, we know from the Empirical Rule that in between 2 standard deviations from the mean
15 are ink jet printers. if a group of 10 printers is chosen at random from the store, find the mean and variance of the number of ink jet printers.
If the airline books 79 people on a flight for which the maximum number is 77, what is the probability that the number of people who show up will exceed the capacity of the plane?
Use this poll result to give 70%, 80%, 90% and 99% confidence intervals for the proportion of all adults who feel this way. What do your results show about the effect of changing the confidence level? (Use Excel)
If the standard deviation is $10,000, can the cable manager conclude that there is a difference? Test at alpha = 0.10.
Find out the mean number of letters that will arrive in two days.
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