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Testing for two Proportions.
One hundred draws are made at random with replacement from box A, and 250 are made at random with replacement from box B.a) 50 of the draws from box A are positive, compared to 131 from box B: 50.0% versus 52.4%. Is this difference real, or due to chance?b) The draws from box A average 1.4 and their SD is 15.3; the draws from box B average 6.3 and their SD is 16.1. Is the difference between the averages statistically significant?
For a regional survey of suburban households to obtain data on television viewing habits, a statistical sample of suburban areas is first selected. Within the chosen areas, statistical samples of whole blocks are selected; and within the selected..
Use the list of random digits below to assign 4 men and 2 women to the shark fin treatment. Read the table from left to right, first selecting the 4 men and then the 2 women. Use the numerical labels given in the chart to the names.
Consider following data on exam scores of 10 randomly selected students: Compute 3rd quartile of the exam scores.
Is this enough evidence to support Union's position? Use significance level of a = 0.05. You may suppose the mean annual salaries are normally distributed.
Taking care to control for weather conditions and other variables as much as possible. Define the null hypothesis.
Employees of a local university have been classified according to gender and job type. The following table provides data about the employees.
Perform Repeated Measures ANOVA also calculate PRE. An educational study uses a simple pre-post design to assess the value of a computer tutor for solving inequalities.
Solve different inventory control problems using an appropriate OR method.
The NY Dept of Motor Vehicles (DMV) designs its license plates with space for 7 letters or numerals. In the most recent iteration, the DMV uses three letters followed by 4 numbers.
Assume that the smiling time of eight-week old babies, in seconds, follows a uniform distribution between 0 and 23 seconds, inclusive. This means that any smiling time from 0 to and including 23 seconds is equally likely.
Determine the standard deviation of difference between Sarah's and Richard's scores?
On average, the size of the difference between the sample mean and the population mean is predicted by:
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