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The probability of success for any trial of a binomial experiment is 25%. Find the probability that the proportion of successes in a sample of 500 is less that 22%. Repeat with a sample of 800. Repeat with a sample of 1,000.
Assuming we can verify that the data set is approximately normally distributed, what percentage of times will the server be down less than 24 minutes?
the probability that a household is both prosperous and educated is P (A and B) = 0.082. What is the probability P (A or B) that the household selected is either prosperous or educated.
To find the necessary sample size to achieve the given level of accuracy of prediction.
Construct and interpret 90 percent on confidence interval for the mean. Be sure to interpret the meaning of this interval.
The average score on the stat midterm was 75 points with a standard deviation of 5 points, and Gregor's z-score was -2. How many points did he score.
Compute mean x and standard deviation s of data above. Calculate Ho by using traditional/classical method.
Construct a frequency distribution and construct a histogram for the following data and use seven intervals, starting with 30-39.
Find the test statistic value for testing the equality of population means of the two samples.
To test whether there is significant mean difference between two groups using independent sample t test.
Is the gender distribution for theater goers significantly different from the distribution for the general college? Test at the .05 level of significance.
A confidence interval increases in width as:
Payne (2001) gave participants a computerized task in which they first see a face and then a picture of either a gun or a tool. The task was to press one button if it was a tool and a different one if it was a gun.
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