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Florida has played a key role in recent elections. Voter registration records show that 41% of Florida voters are registered as Democrats and 37% as Republicans (Most of the others did not choose a party.) To test a random digit dialing device, you use it to call 250 randomly chosen residential telephones in Florida. Of the registered voters contacted, 33% are registered Democrats. Is each of the boldface numbers a parameter or a statistic?
Develop a stem-and-leaf chart. Summarize the number of times each ATM was used. What was the typical, minimum, and maximum number of times each ATM was used?
Find the area under the normal distribution curve to the right of z = -1.03.
The number of customers at a specialty meat store averages about 1500/day. The exact number varies from day to day. On Fridays before long weekends, the number of customers increases to about 3000. Which of the following statements is correct
An automobile insurance company estimates the following loss probabilities for the next year on a $25,000 sports car:
A test was conducted to determine whether gender of a spokesperson affected the likelihood that consumers would prefer a new product.
Find the distribution of the test statistic when the null hypothesis is true, and then show how to get a test size alpha= 0.10
Set up hypotheses to test if distribution of birthdays can be considered coming from uniform distribution.
Suggest one psychological research question that could be answered by each of the following types of statistical tests:
In a batch of 8,000 clock radios 9% are defective. A sample of 15 clock radios is randomly selected without replacement from the 8,000 and tested.
The average cost of a one bedroom apartment in a town is $550 per month. What is the probability of randomly selecting a sample of 50 one bedroom apartments in this town and getting a sample mean of less then $530 if the population standard deviat..
The Speedy Oil Change Company advertised a 15-minute wait for an oil change. A sample of 23 oil changes showed a mean time of 16.5 minutes and a standard deviation of 4.3 minutes.
Conduct a matched pairs t-test to see if the differences in locations is significant - The air in poultry-processing plants often contains fungus spores.
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