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Using data from Boston, Massachusetts, a test of independence is run on the claim that ice cream sales per month and the number of car wrecks per month are independent. The claim is rejected.
Using number of car wrecks as the x variable and ice cream sales as the y variable, an r value of r=0.923 is then computed and shown to exceed the critical value for this data. The data is double checked and verified. This shows that car wrecks cause ice cream sales.
A recent study of 75 workers found that 53 people rode the bus to work each day. Find the 95 percent confidence interval of the proportion of all workers who rode the bus to work.
In a raffle, 1,000 tickets are sold for $2 each. One ticket will be randomly selected and the winner will receive a laptop computer valued at $1200. What is the expected value if a person buys one ticket?
AU Cellular believes their sales are more consistent than their rival Softbank Cellular. Below is the number lost calls a day over the last seven days. Do you agree with AU? Use the .01 significance level.
Dr Johnson wants to know if there is sufficient evidence to conclude that the grade distribution of his class is different than the historical grade distribution. Use a =.05 and .01 and perform a goodness of fit test.
A box contains 5 red marbles and 10 blue marbles. You can take 3 marbles at random, without replacement. What is the probability of winning this game?
The time until a component is taken out of service is uniformly distributed on 0 to 8 hours. Two such independent components are put in series, and the whole system goes down when one of the components goes down.
The weight of a product is normally distributed with a standard deviation of .5 ounces. What should the average weight be if the production manager wants no more than 5 percent of the products to weight more than 5.10 ounces.
Calculate the correlation coefficient. What is the coefficient of determination from these sample statistics? What does this coefficient indicate?
A statistically significant result occurs when the value of the test statistic falls in the rejection region. A result has practical significance when it is statistically significant
Can we conclude that there is a difference in number of citations written between the officers? Use the 0.05 level of significance.
A simple random sample of 50 speeds (in mph) is obtained from cars traveling on a section of I-10 through Tallahassee. The sample has a mean of 72.3 mph and a standard deviation of 7.4 mph. Use a 0.05 significance level to test the claim that the ..
The probability that 0, 1, 2, 3 or 4 people will seek treatment for the flu during any given hour at any given emergency room is shown in the following distribution. What are the variance and standard deviation of X?
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