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Question: Correlation errors. Your Economics instructor assigns your class to investigate factors associated with the gross domestic product (GDP) of nations. Each student examines a different factor (such as Life Expectancy, Literacy Rate, etc.) for a few countries and reports to the class. Apparently, some of your classmates do not understand Statistics very well because you know several of their conclusions are incorrect. Explain the mistakes in their statements below.
a) My correlation of -077.2 shows that there is almost no association between GDP and Infant Mortality Rate.
b) There was a correlation of 0.44 between GDP and Continent.
the mean of sample a is significantly different than the mean of sample b. sample a 59 48 74 62 87 73 sample b 53 67 78
What is the appropriate procedure to test for a significant difference in means between the two groups? Implement the procedure in problem using the critical value method
A researcher believes that the percentage of people who exercise in California is greater than the national exercise rate. The national rate is 20%.
Many states are carefully considering steps that would help them collect sales taxes on items purchased through the Internet.
A uniform probability distribution is a continuous probability distribution where the probability that the random variable assumes a value in any interval of equal length is.
In 2002, Colorado experienced a drought and many towns on the front range issued either mandatory or voluntary water restrictions on outdoor watering. The data file drought .txt contains data from five front range towns on their June 2001 and June..
customers come to a store as a poisson process with rate 12 per hour.a compute the probability of three customers
The National Highway Association is studying the relationship between the number of bidders on a highway project and the winning (lowest) bid for the project.
Hanna Properties specializes in custom-home resales in the Equestrian Estates, an exclusive subdivision in Phoenix, Arizona. A random sample of nine custom homes currently listed for sale provided the following information on size and price.
suppose that a population is known to be normally distributed with mean 2000 and standard deviation 230. if a random
On Saturday morning, calls arrive at TicketMaster at a rate of 108 calls per hour. What is the probability of fewer than three calls in a randomly chosen minute?
Out of a random sample of 33 women, 23 ranked fresh fruit in their top five snack choices. Is there a difference in the proportion of men and women who rank fresh fruit in their top five list of snacks?
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