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cable company reports that the mean salary of its customers across the country is $91,600. To see how this compares, the manager of a local cable company surveys 28 randomly selected local customers and finds that their average income is $88,500.
If the standard deviation is $10,000, can the cable manager conclude that there is a difference? Test at alpha = 0.10.
If university officials say that at least 70% of the voting student population supporting the fee increase, what conclusion can be drawn based on a 95% level of confidence?
It is known that the variance of a population equals 484. A random sample of 81 observations is going to be taken from the population. With a .80 probability, what is the sampling error?
The number of cell phone minutes used by high school seniors follows a normal distribution with a mean of 500 and a standard deviation of 50. What is the probability that a student uses fewer than 400 minutes?
Suppose the federal government proposes to give a substantial tax break to automakers producing midsize cars that get a mean mileage exceeding 31 mpg.
What percent of the SAT verbal scores are less than 675? If 1000 SAT verbal scores are randomly selected about how many would you expect to be greater than 575?
Which measure of family wealth is most important, when making political decisions, the national mean, median or mode?
Find the test statistic value for testing the equality of proportion variances.
The records of a casualty insurance company show that, in the past, its clients have had a mean of 1.8 auto accidents per day with a variance of 0.0016.
One approach would be to contact every psychology graduate student you know and ask them to fill out a questionnaire about it.
The relationship between energy consumption and average car gas mileage, controlling for GDP.
You have at least $30 in change in your drawer, consisting of dimes and quarters. Write an inequality that shows the different number of coins in your drawer.
How many participants need to be enrolled in each group to have 90% chance of detecting a significant difference using a two-sided test with a a= .05 if compliance is perfect?
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