Value of the appropriate test statistic
Out of 87 observations, 67% were successes. Ho: p = 0.54. Confidence level: 98%. What is the value of the appropriate test statistic used to test the null hypothesis?
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95 numbers are rounded off to the nearest integer and then summed. If the individual round-off error are uniformly distributed over (?.5,.5) what is the probability that the resultant sum differs from the exact sum by more than 5?
270 randomly selected light bulbs were tested in a laboratory, 98 lasted more than 500 hours. Find a point estimate of the true proportion of all light bulbs that last more than 500 hours.
A study was conducted by Enron Research to test for a difference inthe mean number of critical care patients in rooms at three area hospitals-Sentara, Inova, Winchester. The following shows the results from random samples drawn from the three:
The National Assessment of Educational Progress (NAEP) periodally administers tests on different subjects to high school students. In 2000, the grade 12 students in the sample average 301 on the mathematics test; the SD was 30. The likely size of
Starting with the formula and substituting values for each variable, provide all the steps of the calculations to arrive at a z-score of +1.4. Show all steps of the calculations to arrive at a z-score of ?2.2.
In a recent health survey, 390 randomly selected college undergraduates were asked, "Regarding your current weight, do you feel that you're: 'About right', 'Overweight', or 'Underweight'?" A contingency table summarizing the results of this survey
A survery found that womens heights are normally distributed with mean of 62.1 and standard deviation of 2.3 in. The survery also found that men's heights are normally distributed with a mean of 68.5 and standard deviation of 2.9. Most of the live
Here are the golf scores (again) of 12 members of a college women's golf team in two rounds of tournament play. (A golf score is the number of strokes required to complete the course, so that low scores are better.) To what extent may we predict t
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