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The average IQ in the population is distributed normally with the mean of 100 and standard deviation of 15. A survey of 22 NBA players has the average IQ of 103 with the standard deviation of 18. Using significance level of 5%, can you say that NBA players are smarter than the average population? What is the value of the test statistic?
You select a random sample of 16 cities similar to Statesville in demographic and economic characteristics and collect the following data on FOOTAGE (in 10,000 square feet) and RETURN (rate of return as a %). a. Analyze the above output to determi..
The President of the American Insurance Institute wants to compare the yearly costs of auto insurance offered by two leading companies.
Assume that a simple random sample has been selected from a normally distributed population. Find the test statistic, P-value, critical value(s), and state the final conclusion.
(A) What sums are needed to calculate a correlation coefficient? (B) What are the two ways of testing a correlation coefficient for significance?
Evaluate the factor effects. Find out which factors are significant in explaining yield.
The following table gives the median incomes of families by level of income and geographical region.
Suppose a fair coin is tossed n times. The probability of obtaining head and tail are the same because this is a fair coin. The proportion of heads is defined as the number of heads appeared divided by n.
Joe Mauer of the Minnesota Twins had the highest batting average in the 2009 Major League Baseball season. His average was .461. So assume the probability of getting a hit is .461 for each time he batted. In a particular game, assume he batted fou..
Why are quasi-experimental designs used more often than experimental designs?
A scatter plot and regression line can be used for all of the following EXCEPT
List the sample space in S and determine the number simple events. What is the probability that the sum of the numbers shown on the upper faces is equal to 7?
The average speed of greyhound dogs is about 18.8 meters per second. A particular greyhound breeder claims that her dogs are faster than the average greyhound. In a sample of 45 dogs, they ran, on average, 19.2 meters per second with a standard de..
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