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1. The following hypotheses are given
H0: rho = 0
H1: rho > 0
A random sample of 12 paired observations indicated a correlation of .32. Can we conclude that the correlation in the population is greater than zero? Use the .05 significance level.
2. The Pennsylvania Refining Company is studying the relationship between the pump price of gasoline and the number of gallons sold. For a sample of 20 stations last Tuesday, the correlation was 0.78. At the .01 significance level, is the correlation in the population greater than zero?
What is the probability that a sample mean will be within plus-or-minus two of the population mean for each of the following sample sizes?
Airlines monitor the causes of flights arriving late. 75% of flights are late because of weather, 35% of flights are late because of ground operations. 10% of flights are late because of weather and ground operations.
Out of the 109 males, 42% preferred Pepsi and out of the 53 females, 40% preferred Pepsi. Pepsi wanted to test to determine if the males preferred Pepsi more than females.
What percentage of items will weigh between 6.4 and 8.9 ounces?
Compute the probability for the given frequency distribution.
Construct a decision table for this problem. Include all conditional values and probabilities in the table.
If there are 12 business-class passengers and 50 tourist-class passengers on a particular flight, what are the expected value of total luggage weight and the standard deviation of the total luggage weight?
Four properties are randomly selected from each neighborhood and the ratios recorded for each as follows:
What are the mean value and standard deviation of the number among these 15 that are from the second section? What are the mean value and standard deviation of the number of projects not among these first 15 that are from the second section?
Determine the largest village in terms of the population?
While dealing with 16 students, suppose that the alternative hypothesis has been one-sided and that it was set as Ha :
Test whether race and NATFAE are independent (α = 0.05). What do you conclude?
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