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Historically, evening long distance phone calls from a particular city have averaged 15.20 minutes per call. In a random sample of 25 calls, the sample mean time was 14.30 minutes per call, with a sample standard deviation of 2 minutes. Use this sample information to test whether or not there has been a change in the average duration of long distance phone calls. Use a .05 level of significance. What is the p value?
Find the regression equation and percentage of variance and test whether the equation is significant portion of the variance.
Use the continuity correction and describe the region of normal curve that corresponds to the indicated binomial probability. The probability of more than 50 right answers.
A month is classified as extremely wet if the amount of rainfall is in the upper 10% for that month. How much precipitation must fall before a month of April is classified as extremely wet?
In order to determine the sum of squares the distance between each data point and the line of the best fit is squared and then all of the squares are summed up. The line of the best fit will minimize this value?
Descriptive statistics for given data - Evaluate the range, variance, and standard deviation of the data set. Interpret the results in the context of the real-life setting.
John earned a score of 89 on both exams. On which exam did John receive the higher letter grade? What was the minimum exam score required for a B in Statistics? What was the minimum exam score required for a B in Psychology?
A new shopping mall is considering setting up an information desk manned by one employee. Based upon information obtained from similar information desks, it is believed that people will arrive at the desk at the rate of 15 per hour.
Which of the following statements isn't a property of the normal probability distribution? Please explain briefly why
Your bakery produces loaves of bread with '1 pound' written on the label. Here are weights of randomly sampled loaves from today's production:
At one excavation site 8641 pot shards have been found that not yet been cleaned and identified. What is the probability that:
How many more days should be included in the sample to be 95% sure the population mean μ is within $50 of the sample mean x?
Using the dataset, produce a graph of per capita GDP for Argentina, China, and Canada from 1965 to 1995. Is inequality between these countries increasing?
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