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Find the 98% confidence interval for the difference between two means based on this information about two samples. Assume independent samples from normal populations. (Use conservative degrees of freedom.) (Give your answers correct to two decimal places.)
Sample Number Mean Std. Dev.
1 11 39 35
2 18 21 24
Lower Limit
Upper Limit
At the 5% level of significance, is there evidence of a difference among the mean access read times for the three files sizes?
A certain airplane has two independent alternators to provide electrical power. The probability that a given alternator will fail on a 1-hour flight is .02. What is the probability that (a) both will fail? (b) Neither will fail? (2) One or the other ..
A marketing survey is taken among fast food customers to determine their preference for hot dogs or pizza. Of the 200 respondents selected,
suppose you want to estimate the average number of sick days taken by all employees at a large company during a year.
Examine the relationship between final grade and the reported hours per week each student said they studied for the course. Do we have evidence that females are being discriminated against?
If we test to see if this is evidence at the 1% significance level that the cost of attendance has increased what is the p-value?
The parameter of interest is the mean score in this population. The sample is an SRS of size n = 4 drawn from the population. a) Find the mean of the 10 scores in the population. This is the population mean.
A certain brand of Green Energy light bulbs was advertised as having an average illumination life-span of 2,500 hours. A random sample of 50 bulbs burned out with a mean life-span of 2,470 hours and a sample standard deviation of 140 hours.
through years of careful observation you have begun to suspect that how vocal cats are is somehow related to the
What is a p-value in testing hypothesis? How does this p-value help us to decide to/not to reject a Null hypothesis?
What percent of the time will a fully charged battery last at least 330 minutes. What is the probability that a random sample of n = 15 batteries results in a mean talk time of at least 330 minutes?
A business operates with 9 locations. Each year, each location is allotted an overtime budget based on the previous years' activity. The total overtime budget for all 9 locations is $10 million.
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